CN101375574A - Polar modulation system - Google Patents
Polar modulation system Download PDFInfo
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- CN101375574A CN101375574A CNA2006800528177A CN200680052817A CN101375574A CN 101375574 A CN101375574 A CN 101375574A CN A2006800528177 A CNA2006800528177 A CN A2006800528177A CN 200680052817 A CN200680052817 A CN 200680052817A CN 101375574 A CN101375574 A CN 101375574A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3252—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using multiple parallel paths between input and output
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
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- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
A system and a method for polar modulation achieved via generation of a multi-level pulse width modulated signal. The system in overview comprises a base-band pre-distortion element (115) producing a pre-distorted signal carrying the amplitude information of the base-band signal, two comparators (140,150) providing two inter-related pulse width modulated signals and a combination and amplification stage (160) that provides a third pulse width modulated radio frequency signal carrying the amplitude and the phase of the base-band signal. The first and second comparators compare a radio -frequenc signal carrying the phase information of the base-band signal with the pre-distorted signal and an inverted copy of the pre-distortion signal respectively.
Description
Technical field
The present invention relates to polarity (polar) modulating system, be specifically related to realize the polar modulation system of polar modulation by producing multipole pulse-width signal.
Background technology
Polar modulation has been proved to be a kind of effective its high-efficiency method that is used to provide multimode and Multiband-operation.In polar modulation, the amplitude and the phase place of independent modulated carrier.This method allows to use identical modulator structure to realize different wireless standards, for example CDMA, TDMA, GSM or GPRS, and can carry out numeral switching when needed at the transmitter place.
Be better than using the homophase I of traditional baseband signal and quadrature Q scalar component to modulate the RF carrier wave, the polar modulation explicitly is with the amplitude of the amplitude A of compound baseband signal modulation RF carrier wave, and can explicitly with the phase place of the angle φ modulation RF carrier wave of compound baseband signal.
A kind ofly realize that the known method of polar modulation is directly to put on power supply by the amplitude A with compound baseband signal, modulate the supply voltage of RF power amplifier, wherein this power amplifier has amplified constant envelope (envelope) phase modulated signal of the phase information of carrying compound baseband signal.Effective for power, carry out the modulation of supply voltage by DC-DC transducer efficiently.The shortcoming of this enforcement is, is reaching high modulation bandwidth and avoiding switching ripple complicated in the DC-DC transducer efficiently.
The another kind of known method of polar modulation of realizing is realized by two level pulse width (PWM) are put on switched power amplifier.In the method, carrier signal that must be by will having modulated amplitude and phase place and triangle or sawtooth compare and could produce pwm signal.Requirement to triangle or sawtooth is that its frequency is the twice of carrier frequency at least.This method comprises over-sampling for the exigent switching frequency of power amplifier, and triangle or sawtooth are highly linears.In addition, carrier signal need be before carrying out pulse width conversion by Modulation and Amplitude Modulation linearly.
Summary of the invention
The present inventor recognizes that improved polar modulation system is useful, and has therefore designed the present invention.
The invention provides a kind of improved system, this system can carry out polar modulation with effective and efficient way, and the switching frequency of its intermediate power amplifier equals the RF carrier frequency, does not need over-sampling.Preferably, the present invention reduces, alleviates or has eliminated one or more shortcoming above-mentioned or that other are independent or any combination.
Therefore, in first aspect, provide a kind of polar modulation system, be used to produce the RF output signal by the baseband signal modulation, this system comprises:
The base band predistortion unit is used to receive the signal of the amplitude of representing baseband signal, and produces the pre-distorted signals of the amplitude information that carries baseband signal;
First comparator, coupling provides first pulse width modulated radio frequency signal with the radiofrequency signal and the pre-distorted signals of the phase information of relatively carrying baseband signal;
Second comparator, coupling is with the radiofrequency signal and the pre-distorted signals of the phase information of relatively carrying baseband signal, second pulse width modulated radio frequency signal is provided, wherein the pre-distorted signals or the radiofrequency signal of carrying phase information (120) when being fed to comparator by anti-phase; And
Combination and amplifying stage make up first pulse width modulated radio frequency signal and second pulse width modulated radio frequency signal, and are used to provide the amplitude that carries baseband signal and the 3rd pulse width modulated radio frequency signal of phase place.
This base band predistortion unit can comprise one or more pre-distortion block, wherein the amplitude of each piece mapping fundamental frequency signal to be to satisfy the particular demands of RF output signal, for example the modification of the modification of duty ratio or the comparator level used in first and second comparators.Switching frequency in first and second comparator outputs place equals typically to be locked into a RF output signal frequency with reference to the RF oscillator.This phase modulated both can be come modulation reference RF oscillator by the derivative with phase place, also can realize by place the phase shifter with modulation function after the RF oscillator.Combination and amplifying stage can make up first and second pulse-width signals, have carried the amplitude of baseband signal and the 3rd pulse width modulated radio frequency signal of phase place thereby produce.According to specific application, combination and amplifying stage can also provide the 3rd pulse-width signal with power demand level to guarantee the correct transmission of modulation signal, for example, if modulator will be used in WLAN, bluetooth applications or the wireless mobile application, then may need different power levels.
Especially but and not exclusively, the present invention is owing to a lot of reasons has advantage.Because this polar modulation system provides Modulation and Amplitude Modulation in himself, therefore do not need extra linear amplitude modulation.Owing to equal the corresponding peak value of sinusoidal RF oscillator signal in the centre position of the pulse of the 3rd pulse-width signal, therefore relatively and do not introduce the conversion of AM to PM in the process of combination.In addition, the switching frequency of first and second comparator outputs place equals the RF output signal frequency, has therefore exempted any demand to the over-sampling at the first or second comparator place.This RF oscillator produces sine output signal, and has therefore exempted the demand of sophisticated signal (for example, the triangle signal of highly linear, sawtooth) more.
As the defined optional feature of claim 2 is favourable, because compare with generating two level pulse width, by generating the amount that three level monitorings, three pulse width modulated radio frequency signal have reduced low-frequency distortion significantly.And all even-order harmonics and corresponding sideband do not exist or exist hardly.And, guarantee that first and second pulse-width signals are complexities that binary signal has reduced the combination stage that produces three level pulse width significantly.
Unit according to comprising combination and amplifying stage discloses alternative embodiment as claim 3 and 4 defined optional features.Comprise as the defined combination of claim 3 and amplifying stage and to contain the single power amplifier that decoder and three level switch output stage, this execution mode is at three level application and specially designed, and minimizes the quantity of required amplifier.The handoff features of output stage causes the low power consumption in this output stage, and therefore obtains efficient.Compare with two level situations, three level features of output stage cause spectrum (no even-order harmonic and corresponding sideband) more clearly.Comprise a plurality of power amplifiers, many λ/4 transmission lines and combiners as defined combination of claim 4 and amplifying stage, this execution mode is specially designed for the use of existing (on-the-shelf) assembly.In this case, compare with three level power amplifiers, each power amplifier only must be handled binary signal, and this causes complexity to reduce.
As the defined optional feature of claim 5 is favourable, because this combination and amplifying stage can be positioned at away from the first and second comparator parts.
As the defined optional feature of claim 6 is favourable, because the bandpass filtering level will provide the filtered version of amplifying pulse-width signal, therefore reduces its frequency component, thereby suppresses to disturb the unnecessary frequency component of other radio systems.
As the defined feature of selecting of claim 7 is favourable, will provide the filtered version of amplifying pulse-width signal because bandpass filtering is system-level, has suppressed high order harmonic component significantly.
Possible different of in the feature of the 3rd pulse width modulated radio frequency signal other are disclosed as claim 8 and 9 defined optional features.In claim 8, the fundamental frequency of the 3rd pulse width modulated radio frequency signal comprises the RF carrier frequency.This means and do not use over-sampling and owe sampling.In claim 9, the fundamental frequency of the 3rd pulse width modulated radio frequency signal is not the RF carrier frequency.According to claim 9, this fundamental frequency can be on the RF carrier frequency or under frequency, the control by pre-distortion unit provides tunability.This situation corresponds respectively to owes sampling and over-sampling.It is favourable owing to sample, because under the sort of situation, selects the switching frequency of combination and amplifying stage to be lower than the RF carrier frequency, causes the efficient of simpler execution mode and Geng Gao.
Possible different in the feature of radiofrequency signal of the phase information of carrying baseband signal are disclosed as claim 10 and 11 defined optional features.In claim 10, the radiofrequency signal of carrying the phase information of baseband signal is the pure sinusoid signal, guarantees the demand of minimum bandwidth of the input stage of first and second comparators.In claim 11, the frequency signal that carries the phase information of baseband signal is the sinusoidal signal of nonlinear distortion, has loosened the linearity requirement to local oscillator.
As the defined optional feature of claim 12 is favourable, because use the polar modulation system of in claim 1, describing will allow transmitter to be used for different transmission standards as required, and for example CDMA, TDMA, GSM or GPRS.The high efficiency of the polar modulation system of describing in claim 1 has superiority for the long battery life in the portable application.
A second aspect of the present invention provides the method for a kind of generation by the RF output signal of baseband signal modulation, may further comprise the steps:
The pre-distorted signals of the amplitude information of baseband signal is carried in generation;
Relatively carry the radiofrequency signal and the pre-distorted signals of the phase information of baseband signal, first pulse width modulated radio frequency signal is provided;
Relatively carry the radiofrequency signal and the pre-distorted signals of the phase information of baseband signal, second pulse width modulated radio frequency signal be provided, wherein, the pre-distorted signals or the radiofrequency signal of carrying phase information (120) when being fed to comparison function all by anti-phase; And
Based on the combination and the amplification of first and second pulse width modulated radio frequency signal, provide the amplitude that carries baseband signal and the 3rd pulse width modulated radio frequency signal of phase place.
A third aspect of the present invention provides computer-readable code, is used to implement the method for second aspect.
Description of drawings
With reference now to accompanying drawing,, only come the present invention is made explanations as example, wherein:
Fig. 1 shows the detailed diagram of generation according to an embodiment of the invention by the unit of the polar modulation system of the RF output signal of baseband signal modulation;
Fig. 2 shows the block diagram according to the unit in the cards of the combination that comprises three level switching output stage of a possibility embodiment of the present invention and amplifying stage;
Fig. 3 a, 3b, 3c and 3d have described some features of the unlike signal that relates in the RF output signal that produces by polar modulation by the baseband signal modulation;
The block diagram that Fig. 4 shows according to the present invention that another may embodiment based on the unit of many power amplifiers and the λ/combination of 4 transmission lines and the alternative realization of amplifying stage.
Embodiment
The invention provides polar modulation system, wherein realize polar modulation by producing many level pulse width, and wherein the RF oscillator output signal of the phase information by relatively carrying baseband signal and the pre-distorted signals that is associated with the amplitude of baseband signal produce many level pulse width.
According to one embodiment of present invention, Fig. 1 shows by producing the block diagram that many level pulse width realize unit required in the system of polar modulation.By producing anti-phase linear amplifier 130, first comparator 140, second comparator 150, combination and amplifying stage 160, band pass filter 170 and the antenna 180 that many level pulse width (100) realize that the system of polar modulation comprises base band predistortion unit 115, has unit gain.First comparator 140 has positive input 148 and negative input 142, the second comparators 150 have positive input 158 and negative input 152.Base band predistortion unit 115 receives the signal 110 of the amplitude information of expression compound baseband signal, and providing pre-distorted signals to the negative input 142 of the anti-phase linear amplifier 130 with unit gain and first comparator 140, this pre-distorted signals is the change version of the amplitude of compound baseband signal.The pre-distorted signals that base band predistortion unit 115 provides is negated in 130, and this signal of negating is provided for the negative input 152 of second comparator 150.Produce the RF oscillator signal by RF oscillator 125, and it is carried out phase modulated by the phase information 120 of baseband signal.Can realize phase modulated by modulating RF oscillator 125 with the derivative of phase place.Also can realize phase modulated by after the RF oscillator, placing phase shifter with modulation function.The RF phase modulated signal is transfused to the positive input of first comparator 148 and the positive input of second comparator 158.The RF carrier frequency that provided by local oscillator is provided the switching frequency of first and second comparator outputs place, and does not need over-sampling.The output of first and second comparators is first and second binary pulse width modulated signals that are mutually related, and is transfused to combination and amplifying stage 160.In quasistatic approximation, when the amplitude of baseband signal is compared variation very slowly the time, the duty ratio dc of first pulse-width signal with the RF cycle
ADuty ratio dc with second pulse-width signal
BFollowing being associated: dc
A=(1-dc
B), wherein, two duty ratios all are the functions of time.The duty ratio dc of first pulse-width signal
ABe 50% or littler, and the duty ratio dc of second pulse-width signal
BBe 50% or bigger.And then when the first pulse-width signal value was 1, needing the value of second pulse-width signal also was 1, and when the value of second pulse-width signal was 0, the value that needs first pulse-width signal equally was 0.Combination and amplifying stage 160 provide three level pulse width of amplification, have made up by the one 140 and the pulse width information that provides of the output signal of the 2 150 comparator.Three level pulse width with 170 pairs of amplifications of band pass filter are carried out filtering, and filtered signal is sent out away through antenna 180.Band pass filter can reduce the bandwidth of pulse-width signal, so mainly comprise its first harmonic and corresponding sideband at the RF signal of output place of band pass filter, has suppressed the high order harmonic component of the pulse-width signal that amplifies significantly.
In the alternative embodiments of the foregoing description, the RF phase modulated signal is transfused to the anti-phase linear amplifier with unit gain, and anti-phase RF phase modulated signal is provided.This anti-phase RF modulation signal is provided for the negative input 152 of second comparator 150.115 pre-distorted signals that obtain directly are provided for the negative input 158 of second comparator 150 from the base band predistortion unit.
System produces to have can realize equally producing more than the pulse-width signal of three level has the target of the signal of frequency spectrum more clearly.
In the alternative enforcement of the foregoing description, band pass filter also can be contained in combination and the amplifying stage, as the LC-oscillation circuit.Combination can separate with distortion unit with comparator and/or base band physically with amplifying stage, band pass filter and/or antenna.Base band and distortion unit can realize in the analog or digital territory.
In another embodiment of the present invention, the radiofrequency signal of carrying the phase information of baseband signal is the sinusoidal signal of nonlinear distortion, and sort signal more is easy to generate than pure sinusoid signal usually.Therefore this execution mode will loosen regulation and the requirement to local RF oscillator 125.
In another embodiment of the present invention, combination and amplifying stage switch output stage based on decoder and three condition.Fig. 2 shows and comprises the block diagram that decoder 220 and three condition switch the unit in the cards of the combination of output stage 240 and amplifying stage.First pulse-width signal 205 is exported from first comparator 140, and second pulse-width signal 210 is exported from first comparator 150, and they all are coupled to the input of decoder 220.This decoder will convert " high level " signal 238 from the level"1" of first pulse-width signal in output place of decoder.Decoder will convert " intermediate level " signal 236 to from the level "0" of first pulse-width signal with from the level"1" of second pulse-width signal in output place of decoder.Decoder will convert " low level " signal 234 signals from " 0 " of second pulse-width signal in output place of decoder.This three condition stage of switches 240 comprises high level power supply 250v
Sup, intermediate level power supply 260v
MidWith low level power 270v
LowThese three power supply v
Sup, v
MidAnd v
LowBe associated by equation (1), and intermediate level power supply 260v
MidVoltage equal or be approximately equal to high level power supply 250v
SupVoltage and low level power 270v
LowHalf of voltage sum.Three condition stage of switches 240 also comprises by three switches 280 of " high level " signal 238, " intermediate level " signal 236 and 234 controls of " low level " signal, provides respectively to have v
Sup, v
MidAnd v
LowThree level pulse width.The output signal of three switches is incorporated into the output node 290 of power amplifier, and three level pulse width of amplification are provided.
V
sup>V
mid>V
low (1)
In another embodiment of the present invention, from the homophase I of baseband signal and quadrature Q component obtain the amplitude 110 (A) of baseband signal and phase information 120 (
).Relation between the amplitude of baseband signal and homophase and the quadrature component is provided by equation (2).
Relation between the phase place of baseband signal and homophase and the quadrature component is provided by equation (3).
Wherein, all variable I, Q, A and
(usually) is the function of time t.
In an embodiment of the present invention, the comparator level of base band predistortion unit generation is associated with the duty ratio of radio-frequency power amplifier amplifying signal.Bandpass filtering guarantees only to have basically that the first harmonic component (comprising its sideband) of binary signal is passed through antenna transmission.Usually, has duty ratio dc
gThe amplitude A of first harmonic of binary signal
gProvide by equation (4)
A
g＝dc
g·sin(π·dc
g)＝1/π·sin(π·dc
g) (4)
In described embodiment, the RF signal that amplitude is A need be transmitted in system, so power amplifier should drive with the binary signal with duty ratio dc, and dc is shown in equation (5).
dc＝1/π·arcsin(π·A) (5)
First pre-distortion block 116 of pre-distortion unit 115 is carried out from the required amplitude A of the RF signal that produces to the transformation at the required duty ratio dc of the signal of power amplifier output.First comparator 140 compares the comparator level signal C1 that the RF oscillator signal and the base band predistortion unit 115 of sinusoidal phase modulation provides.With comparator level signal C1
gTo amplitude is that 1 sinusoidal signal is carried out amplitude limit (slice), and the generation duty ratio is dc
gBinary signal, dc
gShown in equation (6)
In described scheme, system need be by the binary signal driving power amplifier with duty ratio dc shown in equation (5), and therefore, second pre-distortion block 117 of pre-distortion unit 115 should produce comparator level C1, shown in equation (7)
In another embodiment of the present invention, the radiofrequency signal of carrying the phase information of baseband signal is the sinusoidal signal of nonlinear distortion.In this embodiment, can transmit can be by the nonlinear transfer function of pure sinusoid signal for the RF oscillator
The signal of expression, wherein function f is represented the nonlinear distortion transfer function.With comparator level signal C1
gIt is dc that the nonlinear distortion sinusoidal signal is carried out amplitude limit (as providing in the expression formula before) generation duty ratio
gBinary signal, dc
gShown in equation (8)
Wherein, f
InvThe inverse function of representative function f.
Therefore, second pre-distortion block 117 of pre-distortion unit 115 should produce comparator level C1, shown in equation (9)
In Fig. 3, show the basis example of the application of the polar modulation system of the embodiment of proposition before.This example shows the feature of the unlike signal that relates in the RF output signal that produces by polar modulation by the baseband signal modulation.For better understanding is provided, this example has been confined to only carry out the signal of baseband amplitudes modulation.In Fig. 3 a, the amplitude 310 (A) of baseband signal is described as the function of time.In Fig. 3 b, the duty cycle signals 320 (dc) that is produced by first pre-distortion block 116 of base band predistortion unit 115 is depicted as the function of time.In Fig. 3 c, 3 signals are described to the function of time: RF oscillator signal carrier 350, the comparator level 330 (C1) that produces by second pre-distortion block and comparator level anti-phase 340, (C1).When each RF oscillator carrier signal is higher than comparator level C1, produce " high level " signal 238 at decoder 220 places.The RF oscillator signal carrier be lower than comparator level anti-phase-during C1, produce " low level " signal 234 at the decoder place.When the RF oscillator carrier be lower than comparator level C1 and be higher than comparator level anti-phase-during C1, produce " intermediate level " signal 236 at the decoder place.In Fig. 3 d, can see three level pulse width 370 of generation.Fig. 3 d also shows, and the sinusoidal radio frequency signal 360 that obtains in output place of bandpass filtering level 170 is characterised in that, only allows transmission primaries harmonic component (comprising its sideband) basically.
In the another embodiment of the present invention, combination and amplifying stage 160 comprise a plurality of power amplifiers, many λ/4 transmission lines and combiners.Fig. 4 shows the block diagram of the unit of the combination and the alternative realization of amplifying stage.In this embodiment, first power amplifier 410 amplifies the output pulse width modulation signal of first comparator 140, provides first to amplify pulse-width signal.Second power amplifier 420 amplifies the output pulse width modulation signal of second comparator 150, provides second to amplify pulse-width signal.Typically, first and second amplifiers show similar feature.In this embodiment, first and second power amplifiers have low ohm output, and the one 430 and the 2 440 λ/4 transmission lines are used for the voltage source characteristic of the output of first and second power amplifiers is transformed to current source characteristic, and transmission line output allows simply to be connected in parallel at combiner 450 places.
In another embodiment of the present invention,, adjust base band predistortion unit 115 for the pulse-width signal to comparator output place provides fundamental frequency but not the RF carrier frequency.By using suitable amplitude on the duty cycle conversion in first 116 of base band predistortion unit, can realize this specific character.In this special embodiment, can envision two kinds of different situations.The situation that first kind of situation relates to is, the fundamental frequency of the pulse-width signal of comparator output place is lower than the RF carrier frequency, with this situation as owing the situation of sampling.The situation that second kind of situation relates to is, the fundamental frequency of the pulse-width signal of comparator output place is higher than the RF carrier frequency, with this situation as the over-sampling situation.
Relating to duty ratio is dc
gThe N of given binary signal
ThThe amplitude A of order harmonic components
gEquation (4) in the relation of expression can be reduced that integer is owed to sample or the situation of integer over-sampling, shown in equation (10)
Wherein
Integer owe to adopt N ∈ in the situation 2,3,4...}
Integer cross N ∈ in the employing situation 1/2,1/3,1/4...}
In described embodiment, the RF signal that amplitude is A need be transmitted in system, so power amplifier should be that the binary signal of dc drives by duty ratio, and dc is shown in equation (11).
The present invention can realize with any suitable form that comprises hardware, software firmware or these combination in any.The present invention can be implemented as the computer software that operates on one or more data processor and/or the digital signal processor.The unit of the embodiment of the invention and assembly can physically, functionally and logically be realized in any suitable mode.In fact, can realize this function with individual unit, a plurality of unit or as the part of other functional units.Equally, this invention can realize with individual unit, or physically and functionally be distributed between different units and the processor.
Claims (14)
1. polar modulation system that produces the RF output signal, described RF output signal comprise the RF carrier wave and by the baseband signal modulation, this system comprises:
Base band predistortion unit (115) is used to receive the signal of the amplitude (110) of representing baseband signal, and produces the pre-distorted signals of the amplitude information that carries baseband signal;
First comparator (140), coupling is used for relatively carrying the radiofrequency signal and the pre-distorted signals of the phase information (120) of baseband signal, and first pulse width modulated radio frequency signal is provided;
Second comparator (150), coupling is used for relatively carrying the radiofrequency signal and the pre-distorted signals of the phase information (120) of baseband signal, second pulse width modulated radio frequency signal is provided, wherein, the pre-distorted signals or the radiofrequency signal of carrying phase information (120) when being fed to comparator by anti-phase;
Combination and amplifying stage (160) make up first pulse width modulated radio frequency signal and second pulse width modulated radio frequency signal, and are used to provide the amplitude that carries baseband signal and the 3rd pulse width modulated radio frequency signal of phase place.
2. according to the system of claim 1, wherein, first and second pulse width modulated radio frequency signal are binary signals, and the 3rd pulse width modulated radio frequency signal is a three level signal.
3. according to the system of claim 2, wherein, combination and amplifying stage (160) comprise the single power amplifier that contains decoder (220) and three level switching output stages (240).
4. according to the system of claim 1, wherein, combination and amplifying stage comprise a plurality of power amplifiers (410,420), many λ/4 transmission lines (430,440) and combiner (450).
5. according to the system of claim 1, wherein, combination and amplifying stage are away from other assembly in the system.
6. according to the system of claim 1, further comprise bandpass filtering level (170), be used for the amplified version of pulse-width signal is carried out filtering.
7. according to the system of claim 6, wherein, bandpass filtering level (170) is restricted to first harmonic and corresponding sideband basically with transmission signals.
8. according to the system of claim 1, wherein, the fundamental frequency of the 3rd pulse width modulated radio frequency signal comprises the RF carrier frequency.
9. according to the system of claim 1, wherein, the fundamental frequency of the 3rd pulse width modulated radio frequency signal is different from the RF carrier frequency.
10. according to the system of claim 1, wherein, the radiofrequency signal of carrying the phase information of baseband signal is a sinusoidal signal.
11. according to the system of claim 1, wherein, the radiofrequency signal of carrying the phase information of baseband signal is the sinusoidal signal of nonlinear distortion.
12. a transmitter comprises the modulating system according to claim 1.
13. a generation comprises the RF carrier wave and by the method for the RF output signal of baseband signal modulation, may further comprise the steps:
The pre-distorted signals of the amplitude information of baseband signal is carried in generation;
Relatively carry the radiofrequency signal and the pre-distorted signals of the phase information of baseband signal, first pulse width modulated radio frequency signal is provided;
Relatively carry the radiofrequency signal and the pre-distorted signals of the phase information of baseband signal, second pulse width modulated radio frequency signal be provided, wherein, the pre-distorted signals or the radiofrequency signal of carrying phase information (120) when being fed to comparator by anti-phase;
Make up first pulse width modulated radio frequency signal and second pulse width modulated radio frequency signal, so that the amplitude that carries baseband signal and the 3rd pulse width modulated radio frequency signal of phase place are provided.
14. computer-readable code of implementing the method for claim 13.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05112209.1 | 2005-12-15 | ||
| EP05112209 | 2005-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101375574A true CN101375574A (en) | 2009-02-25 |
Family
ID=38020356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800528177A Pending CN101375574A (en) | 2005-12-15 | 2006-12-12 | Polar modulation system |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1969797A2 (en) |
| CN (1) | CN101375574A (en) |
| WO (1) | WO2007069193A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9172329B2 (en) * | 2012-08-01 | 2015-10-27 | Nxp B.V. | Harmonic suppression in switching amplifiers |
| EP3672069B1 (en) | 2018-12-21 | 2022-06-22 | Nxp B.V. | A power amplifier and method of operating a power amplifier |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5115203A (en) * | 1990-06-25 | 1992-05-19 | Rockwell International Corporation | Digital power amplifier |
| US6993087B2 (en) * | 2001-06-29 | 2006-01-31 | Nokia Mobile Phones Ltd. | Switching mode power amplifier using PWM and PPM for bandpass signals |
| EP1632024A2 (en) * | 2003-05-09 | 2006-03-08 | Danmarks Tekniske Universitet | Global loop integrating modulator |
| US6879209B2 (en) * | 2003-07-08 | 2005-04-12 | Icefyre Semiconductor Corp. | Switched-mode power amplifier using lumped element impedance inverter for parallel combining |
-
2006
- 2006-12-12 EP EP06842443A patent/EP1969797A2/en not_active Withdrawn
- 2006-12-12 WO PCT/IB2006/054763 patent/WO2007069193A2/en active Application Filing
- 2006-12-12 CN CNA2006800528177A patent/CN101375574A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP1969797A2 (en) | 2008-09-17 |
| WO2007069193A3 (en) | 2008-01-31 |
| WO2007069193A2 (en) | 2007-06-21 |
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