CN117240220A - Radio frequency voltage controlled oscillator and electronic equipment - Google Patents
Radio frequency voltage controlled oscillator and electronic equipment Download PDFInfo
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- CN117240220A CN117240220A CN202311499864.8A CN202311499864A CN117240220A CN 117240220 A CN117240220 A CN 117240220A CN 202311499864 A CN202311499864 A CN 202311499864A CN 117240220 A CN117240220 A CN 117240220A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The application provides a radio frequency voltage controlled oscillator and electronic equipment, which relate to the technical field of circuits, wherein the radio frequency voltage controlled oscillator comprises: the phase noise performance optimizing circuit and the frequency adjusting circuit are connected in series; the phase noise performance optimization circuit is used for increasing the common mode inductance to reduce the phase noise of the radio frequency voltage-controlled oscillator; the frequency adjusting circuit is used for adjusting the frequency of the radio frequency voltage-controlled oscillator based on the differential mode capacitance and the varactor diode. In the mode, the frequency of the radio frequency voltage-controlled oscillator is adjusted based on the differential mode capacitor and the varactor through the frequency adjusting circuit, and the common mode inductance is increased through the phase noise performance optimizing circuit so as to reduce the phase noise of the radio frequency voltage-controlled oscillator, so that the optimization of the phase noise and the accurate adjustment of the frequency of the radio frequency voltage-controlled oscillator are realized.
Description
Technical Field
The present application relates to the field of circuit technologies, and in particular, to a radio frequency voltage controlled oscillator and an electronic device.
Background
With the development of wireless communications, higher demands are being placed on frequency synthesizer phase locked loop modules in transceivers. The performance index of single-point phase noise of the voltage-controlled oscillator as a core module in the phase-locked loop also faces higher challenges. For example, current mainstream Wi-Fi 6 (802.11 ax) technology needs to have faster speed, higher bandwidth, and better performance to support its data transmission. The data transmission speed supported by Wi-Fi 6 can reach 10 Gbps at most, and is 4 times faster than that of the previous generation Wi-Fi 5 (802.11 ac). Wi-Fi 6 can split data flow, so that more data can be transmitted at the same time, the maximum sub-bandwidth can reach 160 MHz, and the maximum sub-bandwidth is doubled compared with Wi-Fi 5. These new application scenarios are urgently demanding voltage controlled oscillators with higher operating frequencies and more excellent phase noise than before.
Disclosure of Invention
Accordingly, an objective of the present application is to provide a radio frequency voltage controlled oscillator and an electronic device for optimizing the phase noise performance of the radio frequency voltage controlled oscillator and more precisely adjusting the frequency of the radio frequency voltage controlled oscillator.
In a first aspect, an embodiment of the present application provides a radio frequency voltage controlled oscillator, including: the phase noise performance optimizing circuit and the frequency adjusting circuit are connected in series; the phase noise performance optimization circuit is used for increasing the common mode inductance to reduce the phase noise of the radio frequency voltage-controlled oscillator; the frequency adjusting circuit is used for adjusting the frequency of the radio frequency voltage-controlled oscillator based on the differential mode capacitance and the varactor diode.
In a preferred embodiment of the present application, the phase noise performance optimization circuit includes: the first end of the first resonant inductor is connected with the second end of the second resonant inductor, the second end of the second resonant inductor is connected with the power supply, the first end of the third resonant inductor is connected with the second end of the fourth resonant inductor, the second end of the third resonant inductor is connected with the frequency adjusting circuit, the first end of the fourth resonant inductor is connected with the power supply, the first end of the first resonant capacitor is connected with the first end of the second resonant inductor, the second end of the first resonant capacitor is connected with the second end of the first resonant inductor, the first end of the second common mode capacitor is connected with the first end of the first resonant inductor, and the second end of the second common mode capacitor is connected with the second end of the third resonant inductor.
In a preferred embodiment of the present application, the second resonant inductor and the fourth resonant inductor are both in an 8-shaped structure.
In a preferred embodiment of the present application, the frequency adjustment circuit includes: the frequency coarse tuning circuit is connected with the frequency fine tuning circuit in parallel.
In a preferred embodiment of the present application, the frequency coarse adjustment circuit includes an energy supply circuit and a differential mode capacitance adjustment circuit, and the energy supply circuit and the differential mode capacitance adjustment circuit are connected in parallel; the energy supply circuit is used for providing negative resistance for the oscillation of the radio frequency voltage-controlled oscillator; the differential-mode capacitance adjusting circuit is used for adjusting the frequency of the radio-frequency voltage-controlled oscillator by adjusting the differential-mode capacitance.
In a preferred embodiment of the present application, the power supply circuit includes: the drain end of the first transistor of the fork coupling pair tube is connected with the first end of the differential mode capacitance adjusting circuit, the drain end of the second transistor of the fork coupling pair tube is connected with the second end of the differential mode capacitance adjusting circuit, the source end of the first transistor of the fork coupling pair tube is grounded, and the source end of the second transistor of the fork coupling pair tube is grounded.
In a preferred embodiment of the present application, the differential-mode capacitance adjusting circuits are plural, and the plural differential-mode capacitance adjusting circuits are connected in parallel.
In a preferred embodiment of the present application, the differential-mode capacitance adjusting circuit includes a first differential-mode capacitance, a switch, and a second differential-mode capacitance, and the first differential-mode capacitance, the switch, and the second differential-mode capacitance are sequentially connected in series.
In a preferred embodiment of the present application, the frequency fine tuning circuit includes a varactor, a first end of the varactor is connected to a first end of the first differential-mode capacitor, and a second end of the varactor is connected to a second end of the second differential-mode capacitor.
In a second aspect, an embodiment of the present application further provides an electronic device, including the radio frequency voltage controlled oscillator of the first aspect.
The embodiment of the application has the following beneficial effects:
the embodiment of the application provides a radio frequency voltage-controlled oscillator and electronic equipment, wherein the frequency of the radio frequency voltage-controlled oscillator is adjusted based on a differential mode capacitor and a varactor through a frequency adjusting circuit, and the common mode inductance is increased through a phase noise performance optimizing circuit so as to reduce the phase noise of the radio frequency voltage-controlled oscillator, thereby realizing the optimization of the phase noise and the accurate adjustment of the frequency of the radio frequency voltage-controlled oscillator.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the techniques of the disclosure.
The foregoing objects, features and advantages of the disclosure will be more readily apparent from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a graph showing a current trend in a differential inductor in a conventional common mode provided in an embodiment of the present application;
fig. 2 is a block diagram of a radio frequency voltage controlled oscillator according to an embodiment of the present application;
fig. 3 is a block diagram of another radio frequency voltage controlled oscillator according to an embodiment of the present application;
fig. 4a is a structural diagram of a resonant inductor according to an embodiment of the present application;
fig. 4b is a schematic diagram of another resonant inductor according to an embodiment of the present application;
FIG. 4c is a graph illustrating current trend in differential mode according to an embodiment of the present application;
FIG. 4d is a graph showing current trend in the common mode according to the embodiment of the present application;
FIG. 5 is a block diagram of an energizing circuit provided by an embodiment of the present application;
FIG. 6 is a block diagram of a differential-mode capacitance adjusting circuit according to an embodiment of the present application;
fig. 7 is an overall structure diagram of a radio frequency voltage controlled oscillator according to an embodiment of the present application.
The diagram is:
10-phase noise performance optimization circuit; 20-a frequency adjustment circuit; 101-a first resonant inductance; 102-a second resonant inductance; 103-a third resonant inductance; 104-a fourth resonant inductance; 105-a first common mode capacitance; 106-a second common mode capacitance; 107-power supply; 21-a frequency coarse tuning circuit; 22-a frequency fine-tuning circuit; 211-an energizing circuit; 212-a differential mode capacitance adjustment circuit; 2111-fork coupling pair tubes; 2121-a first differential mode capacitance; 2122-switch; 2123-second differential mode capacitance; 221-a varactor; 2211—a first terminal of a varactor; 2212-the second terminal of the varactor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
With the development of wireless communications, higher demands are being placed on frequency synthesizer phase locked loop modules in transceivers. The performance index of single-point phase noise of the voltage-controlled oscillator as a core module in the phase-locked loop also faces higher challenges. For example, current mainstream Wi-Fi 6 (802.11 ax) technology needs to have faster speed, higher bandwidth, and better performance to support its data transmission. The data transmission speed supported by Wi-Fi 6 can reach 10 Gbps at most, and is 4 times faster than that of the previous generation Wi-Fi 5 (802.11 ac). Wi-Fi 6 can split data flow, so that more data can be transmitted at the same time, the maximum sub-bandwidth can reach 160 MHz, and the maximum sub-bandwidth is doubled compared with Wi-Fi 5. These new application scenarios are urgently demanding voltage controlled oscillators with higher operating frequencies and more excellent phase noise than before.
The mainstream architecture of the radio frequency integrated voltage-controlled oscillator on the silicon substrate is generally classified into different architectures such as class B, class C, class F and the like according to different conduction angles of cross-coupled pair transistors. Among them, class B voltage controlled oscillators are favored in engineering because of their compact circuitry and superior performance, and conventional class B voltage controlled oscillators have been improved over the years. To reduce the extra noise introduced by conventional tail current tubes, e.hegazi proposes inserting an L-C parallel resonant cavity between the source and ground of the cross-coupled pair of tubes, at a resonant frequency of 2 times the oscillation frequency and replacing the tail current source, achieving a high resistance of the resonant current on the common mode path to optimize the phase noise, with the disadvantage of requiring an extra tail inductance, increasing the area of the VCO (see e.hegazi, h.sjoand, and a.a. Abidi, "A fifiltering technique to lower LC oscillator phase noise" IEEE j. Solid-State Circuits, vol. 36, no. 12, pp. 1921-1930, dec. 2001). On the basis, the D.Murphy provides an implicit common mode resonance concept, and a common circuit architecture based on a second harmonic filtering voltage-controlled oscillator is quickly formed, the structure removes the traditional secondary resonance tail inductance, a common mode resonance loop of a differential inductance in a main resonant cavity is utilized to replace the common mode resonance loop, only one inductance is used for constructing high resistance of the differential mode resonance and the common mode resonance at the same time, the area on a chip is greatly saved, the second harmonic wave and a fundamental wave are in the same phase, and phase noise converted by a flick noise caused by a phase error is eliminated (see D.Murphy, H.Darabi, and H.wu, "A VCO with implicit common mode resonance," in IEEE int, solid-State Circuits Conf (ISSCC) dig.Tech. Paper, feb.2015, pp.1-3). But this structure is defective.
For ease of understanding, fig. 1 is a diagram illustrating a current trend in a differential inductor in a conventional common mode provided in an embodiment of the present application.
As shown in fig. 1, in the conventional common mode, current flows symmetrically from both ends of the differential inductor to the Ground (GND), and the current directions on adjacent tracks are opposite (as shown in the dashed box in fig. 1), so that the magnetic fields cancel, resulting in a decrease in the common mode inductance. The following formula (1) is a formula of common mode impedance:
（1）
wherein,representing the common mode impedance, ">Represents the oscillation angular frequency, +.>Representing common mode inductance, ">Representing the coupling coefficient>Representing the common mode capacitance.
The following formula (2) is a formula of a quality factor of the common mode inductance:
（2）
wherein,quality factor representing common mode inductance, +.>Representing common mode inductance, ">Representing common mode capacitance, < >>Represents the oscillation angular frequency, +.>Representing the coupling coefficient.
As can be seen from the formulas (1) and (2), the reduction of the common-mode inductance reduces both the common-mode impedance and the quality factor of the common-mode inductance, and the phase noise is inversely proportional to the common-mode impedance and inversely proportional to the quality factor of the common-mode inductance, so that the phase noise is also deteriorated when the common-mode inductance is reduced.
Based on the above, the frequency of the radio frequency voltage-controlled oscillator is adjusted by the frequency adjusting circuit based on the differential mode capacitance and the varactor diode, and the common mode inductance is increased by the phase noise performance optimizing circuit to reduce the phase noise of the radio frequency voltage-controlled oscillator, so that the optimization of the phase noise and the accurate adjustment of the frequency of the radio frequency voltage-controlled oscillator are realized.
For the sake of understanding the present embodiment, a radio frequency voltage controlled oscillator disclosed in the present embodiment will be described in detail.
Example 1
An embodiment of the present application provides a radio frequency voltage controlled oscillator, and fig. 2 is a structural diagram of the radio frequency voltage controlled oscillator provided by the embodiment of the present application.
As shown in fig. 2, the radio frequency voltage controlled oscillator may include a phase noise performance optimization circuit 10 and a frequency adjustment circuit 20, the phase noise performance optimization circuit 10 and the frequency adjustment circuit 20 being connected in series.
Wherein the phase noise performance optimization circuit 10 is configured to increase the common mode inductance to reduce the phase noise of the radio frequency voltage controlled oscillator.
Specifically, the purpose of increasing the common mode inductance can be achieved by changing the winding method of the resonant inductance.
Since the phase noise is inversely proportional to the common mode impedance and inversely proportional to the quality factor of the common mode inductance, and as can be seen from the above equation (1) and equation (2), the reduction of the common mode inductance reduces both the quality factors of the common mode impedance and the common mode inductance, thereby causing deterioration of the phase noise, so that the purpose of reducing the phase noise of the radio frequency voltage controlled oscillator can be achieved by increasing the common mode inductance.
Wherein the frequency adjusting circuit 20 is configured to adjust the frequency of the radio frequency voltage controlled oscillator based on the differential mode capacitance and the varactor 221.
Specifically, the frequency of the rf voltage controlled oscillator may be coarsely adjusted by adjusting the size of the differential mode capacitance, and the capacitance may be changed by applying a voltage to the varactor 221, thereby further finely adjusting the frequency of the rf voltage controlled oscillator.
According to the radio frequency voltage-controlled oscillator provided by the embodiment of the application, the frequency of the radio frequency voltage-controlled oscillator is adjusted based on the differential mode capacitance and the varactor 221 through the frequency adjusting circuit 20, and the common mode inductance is increased through the phase noise performance optimizing circuit 10 to reduce the phase noise of the radio frequency voltage-controlled oscillator, so that the optimization of the phase noise and the accurate adjustment of the frequency of the radio frequency voltage-controlled oscillator are realized.
Example 2
The embodiment of the application also provides another radio frequency voltage-controlled oscillator; the radio frequency voltage controlled oscillator is realized on the basis of the radio frequency voltage controlled oscillator mentioned in the embodiment; this method focuses on the specific structures of the phase noise performance optimization circuit 10 and the frequency adjustment circuit 20.
Fig. 3 is a block diagram of another radio frequency voltage controlled oscillator according to an embodiment of the present application, as shown in fig. 3, the radio frequency voltage controlled oscillator may include: the phase noise performance optimization circuit 10 includes a first resonant inductor 101, a second resonant inductor 102, a third resonant inductor 103, a fourth resonant inductor 104, a first common mode capacitor 105, a second common mode capacitor 106, and a power supply 107.
The phase noise performance optimization circuit 10 includes a first resonant inductor 101, a second resonant inductor 102, a third resonant inductor 103, a fourth resonant inductor 104, a first common-mode capacitor 105, a second common-mode capacitor 106, and a power supply 107, where a first end of the first resonant inductor 101 is connected to a second end of the second resonant inductor 102, a second end of the first resonant inductor 101 is connected to a frequency adjustment circuit, a first end of the second resonant inductor 102 is connected to the power supply 107, a first end of the third resonant inductor 103 is connected to a second end of the fourth resonant inductor 104, a second end of the third resonant inductor 103 is connected to the frequency adjustment circuit, a first end of the fourth resonant inductor 104 is connected to the power supply 107, a first end of the first common-mode capacitor 105 is connected to a first end of the second resonant inductor 102, a first end of the first common-mode capacitor 105 is connected to a second end of the first resonant inductor 101, a first end of the second common-mode capacitor 106 is connected to a first end of the fourth resonant inductor 104, and a second end of the second common-mode capacitor 106 is connected to a second end of the third resonant inductor 103.
The first resonant inductor 101 and the third resonant inductor 103 generate mutual inductance with a coupling coefficient of k, and the second resonant inductor 102 and the fourth resonant inductor 104 generate mutual inductance with a coupling coefficient of k.
The second resonant inductor 102 and the fourth resonant inductor 104 are both in an 8-shaped structure.
It should be noted that the first end mentioned above is the end above the resonant inductor and the common-mode capacitor in fig. 3, and the second end is the end below the resonant inductor and the common-mode capacitor in fig. 3.
For convenience of understanding, fig. 4a is a structural diagram of one resonant inductor provided by an embodiment of the present application, fig. 4b is a structural diagram of another resonant inductor provided by an embodiment of the present application, fig. 4c is a current trend diagram in a differential mode provided by an embodiment of the present application, and fig. 4d is a current trend diagram in a common mode provided by an embodiment of the present application.
Note that, the structure shown in fig. 4a is a structure of the first resonant inductor 101 and the third resonant inductor 103, the structure shown in fig. 4b is a structure of the second resonant inductor 102 and the fourth resonant inductor 104, the current profile shown in fig. 4c is a current profile after the first resonant inductor 101 and the second resonant inductor 102 are connected in series in the differential mode, and the current profile shown in fig. 4d is a current profile after the first resonant inductor 101 and the second resonant inductor 102 are connected in series in the common mode.
In the differential mode, the current trend of the third resonant inductor 103 and the fourth resonant inductor 104 after being connected in series is the same as the current trend of the first resonant inductor 101 and the second resonant inductor 102 after being connected in series, and in the common mode, the current trend of the third resonant inductor 103 and the fourth resonant inductor 104 after being connected in series is also the same as the current trend of the first resonant inductor 101 and the second resonant inductor 102 after being connected in series.
As shown in fig. 4c, the current directions of the upper half and the lower half of the "8" shape of the second resonant inductor 102 are opposite (as shown in the dashed box), so that the internal magnetic fields of the second resonant inductor 102 cancel each other out, and do not affect the magnetic flux of the first resonant inductor 101.
As shown in fig. 4d, the current direction of the upper half and the lower half of the "8" shape of the second resonant inductor 102 is the same, and the current direction of the outer coil of the first resonant inductor 101 is also the same (as shown in the dotted line box), so that magnetic field superposition occurs, and thus magnetic flux increases, and common mode inductance increases.
In summary, according to the above formulas (1) and (2), and the phase noise is inversely proportional to the common mode impedance, and inversely proportional to the quality factor of the common mode inductance, it is known that the common mode inductance increases, thereby achieving the purpose of optimizing the phase noise. And by connecting the second resonant inductor 102 in the shape of an 8 in series in the first resonant inductor 101, no additional area is added, so that the radio frequency voltage controlled oscillator is more compact.
It should be noted that the current trend in the third resonant inductor 103 and the fourth resonant inductor 104 and the influence of the fourth resonant inductor 104 on the third resonant inductor 103 are the same as the current trend in the first resonant inductor 101 and the second resonant inductor 102 and the influence of the second resonant inductor 102 on the first resonant inductor 101, and are not described herein.
In one embodiment of the present application, the frequency adjustment circuit 20 includes a frequency coarse adjustment circuit 21 and a frequency fine adjustment circuit 22, and the frequency coarse adjustment circuit 21 and the frequency fine adjustment circuit 22 are connected in parallel. The frequency coarse tuning circuit 21 is used for coarsely tuning the frequency of the radio frequency voltage-controlled oscillator; the frequency fine tuning circuit 22 is used to fine tune the frequency of the radio frequency voltage controlled oscillator.
Specifically, the frequency rough adjustment circuit 21 includes an energization circuit 211 and a differential-mode capacitance adjustment circuit 212, and the energization circuit 211 and the differential-mode capacitance adjustment circuit 212 are connected in parallel.
Wherein the power supply circuit 211 is configured to provide negative resistance for oscillation of the radio frequency voltage controlled oscillator; the differential-mode capacitance adjusting circuit 212 is used for adjusting the frequency of the radio frequency voltage-controlled oscillator by adjusting the differential-mode capacitance.
For easy understanding, fig. 5 is a block diagram of an energy supply circuit provided in an embodiment of the present application, as shown in fig. 5, the energy supply circuit 211 includes a pair of fork-coupled tubes 2111, a drain terminal of a first transistor of the pair of fork-coupled tubes 2111 is connected to a first terminal of the differential-mode capacitance adjustment circuit 212, a drain terminal of a second transistor of the pair of fork-coupled tubes 2111 is connected to a second terminal of the differential-mode capacitance adjustment circuit 212, a source terminal of the first transistor of the pair of fork-coupled tubes 2111 is grounded, and a source terminal of the second transistor of the pair of fork-coupled tubes 2111 is grounded.
The first transistor of the pair of fork-coupled transistors 2111 is not distinguished from the second transistor of the pair of fork-coupled transistors 2111, the first transistor of the pair of fork-coupled transistors 2111 may be the second transistor of the pair of fork-coupled transistors 2111 in the left end of fig. 5, and similarly, the first transistor of the pair of fork-coupled transistors 2111 may be the second transistor of the pair of fork-coupled transistors 2111 in the right end, the first end of the differential-mode capacitance adjusting circuit 212 is connected to the left end of the differential-mode capacitance adjusting circuit 212 in fig. 5, and the second end of the differential-mode capacitance adjusting circuit 212 is connected to the right end of the differential-mode capacitance adjusting circuit 212 in fig. 5.
For easy understanding, fig. 6 is a block diagram of a differential-mode capacitance adjusting circuit according to an embodiment of the present application, and as shown in fig. 6, the differential-mode capacitance adjusting circuit 212 includes a first differential-mode capacitance 2121, a switch 2122, and a second differential-mode capacitance 2123, where the first differential-mode capacitance 2121, the switch 2122, and the second differential-mode capacitance 2123 are sequentially connected in series.
The differential-mode capacitance adjusting circuits 212 are plural, and the differential-mode capacitance adjusting circuits 212 are connected in parallel.
When the frequency needs to be adjusted, the number of the differential-mode capacitance adjusting circuits 212 can be controlled by controlling the on and off of the switch 2122, so that the capacitance is adjusted, and the frequency is adjusted.
Specifically, the frequency fine-tuning circuit 22 includes a varactor 221, a first end 2211 of which is connected to a first end of a first differential-mode capacitor 2121, and a second end 2212 of which is connected to a second end of a second differential-mode capacitor 2123.
Preferably, fig. 7 is an overall structure diagram of a radio frequency voltage controlled oscillator according to an embodiment of the present application. By connecting the parts in the above embodiments, an optimal radio frequency voltage controlled oscillator is obtained.
Further, after phase noise optimization, the optimization condition of the phase noise can be simulated, and the magnitude of the phase noise improvement is determined through a simulation result.
According to the radio frequency voltage-controlled oscillator provided by the embodiment of the application, the second resonant inductor 102 with the 8-shaped structure is connected in series to the first resonant inductor 101, and the fourth resonant inductor 104 with the 8-shaped structure is connected in series to the second resonant inductor 102, so that extra area is not increased, and in a common mode, magnetic field superposition is generated, so that magnetic flux is increased, the common mode inductance is increased, phase noise is reduced, and the phase noise optimization effect is achieved.
Example 3
The embodiment of the application also provides electronic equipment which is used for running the radio frequency voltage-controlled oscillator; the frequency of the radio frequency voltage controlled oscillator is adjusted based on the differential mode capacitance and the varactor 221 by the frequency adjusting circuit 20, and the common mode inductance is increased by the phase noise performance optimizing circuit 10 to reduce the phase noise of the radio frequency voltage controlled oscillator, so that the optimization of the phase noise and the accurate adjustment of the frequency of the radio frequency voltage controlled oscillator are realized.
Finally, it should be noted that: the above examples are only specific embodiments of the present application, and are not intended to limit the scope of the present application, but it should be understood by those skilled in the art that the present application is not limited thereto, and that the present application is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. A radio frequency voltage controlled oscillator, the radio frequency voltage controlled oscillator comprising: the phase noise performance optimizing circuit is connected with the frequency adjusting circuit in series;
the phase noise performance optimization circuit is used for increasing common mode inductance to reduce phase noise of the radio frequency voltage-controlled oscillator;
the frequency adjusting circuit is used for adjusting the frequency of the radio frequency voltage-controlled oscillator based on the differential mode capacitance and the varactor.
2. The radio frequency voltage controlled oscillator of claim 1, wherein the phase noise performance optimization circuit comprises a first resonant inductor, a second resonant inductor, a third resonant inductor, a fourth resonant inductor, a first common mode capacitor, a second common mode capacitor, and a power supply, wherein a first end of the first resonant inductor is connected to a second end of the second resonant inductor, a second end of the first resonant inductor is connected to the frequency adjustment circuit, a first end of the second resonant inductor is connected to the power supply, a first end of the third resonant inductor is connected to a second end of the fourth resonant inductor, a second end of the third resonant inductor is connected to the frequency adjustment circuit, a first end of the fourth resonant inductor is connected to the power supply, a first end of the first common mode capacitor is connected to a first end of the second resonant inductor, a first end of the second common mode capacitor is connected to a second end of the first resonant inductor, a first end of the second common mode capacitor is connected to a second end of the fourth resonant inductor, and a second end of the second common mode capacitor is connected to a second end of the second resonant inductor.
3. The radio frequency voltage controlled oscillator of claim 2, wherein the second resonant inductor and the fourth resonant inductor are each in an "8" shape.
4. The radio frequency voltage controlled oscillator of claim 1, wherein the frequency adjustment circuit comprises a coarse frequency adjustment circuit and a fine frequency adjustment circuit, the coarse frequency adjustment circuit and the fine frequency adjustment circuit being connected in parallel.
5. The radio frequency voltage controlled oscillator of claim 4, wherein the coarse frequency tuning circuit comprises an energizing circuit and a differential mode capacitance adjustment circuit, the energizing circuit and the differential mode capacitance adjustment circuit being connected in parallel;
the energy supply circuit is used for providing negative resistance for the oscillation of the radio frequency voltage-controlled oscillator;
the differential mode capacitance adjusting circuit is used for adjusting the frequency of the radio frequency voltage-controlled oscillator by adjusting the differential mode capacitance.
6. The radio frequency voltage controlled oscillator of claim 5, wherein the power supply circuit comprises a pair of fork-coupled transistors, a drain of a first transistor of the pair of fork-coupled transistors being connected to the first end of the differential-mode capacitance adjustment circuit, a drain of a second transistor of the pair of fork-coupled transistors being connected to the second end of the differential-mode capacitance adjustment circuit, a source of the first transistor of the pair of fork-coupled transistors being grounded, and a source of the second transistor of the pair of fork-coupled transistors being grounded.
7. The radio frequency voltage controlled oscillator of claim 6, wherein the differential mode capacitance adjustment circuit is a plurality of the differential mode capacitance adjustment circuits connected in parallel.
8. The radio frequency voltage controlled oscillator of claim 7, wherein the differential mode capacitance adjustment circuit comprises a first differential mode capacitance, a switch, and a second differential mode capacitance, the first differential mode capacitance, the switch, and the second differential mode capacitance being serially connected in sequence.
9. The radio frequency voltage controlled oscillator of claim 8, wherein the frequency fine tuning circuit comprises a varactor, a first terminal of the varactor being connected to a first terminal of the first differential mode capacitor, a second terminal of the varactor being connected to a second terminal of the second differential mode capacitor.
10. An electronic device comprising the radio frequency voltage controlled oscillator of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311499864.8A CN117240220A (en) | 2023-11-13 | 2023-11-13 | Radio frequency voltage controlled oscillator and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311499864.8A CN117240220A (en) | 2023-11-13 | 2023-11-13 | Radio frequency voltage controlled oscillator and electronic equipment |
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| CN117240220A true CN117240220A (en) | 2023-12-15 |
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| CN202311499864.8A Pending CN117240220A (en) | 2023-11-13 | 2023-11-13 | Radio frequency voltage controlled oscillator and electronic equipment |
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