CN2762436Y - High precision temp.-compensation device for stabilizing intermodulation performance of power amplifier - Google Patents
High precision temp.-compensation device for stabilizing intermodulation performance of power amplifier Download PDFInfo
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- CN2762436Y CN2762436Y CN 200420112458 CN200420112458U CN2762436Y CN 2762436 Y CN2762436 Y CN 2762436Y CN 200420112458 CN200420112458 CN 200420112458 CN 200420112458 U CN200420112458 U CN 200420112458U CN 2762436 Y CN2762436 Y CN 2762436Y
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Abstract
The utility model relates to a simple, economical and high precision temperature compensating device for stabilizing the intermodulation performance of a power amplifier, which is composed of a voltage stabilizing and low pressure difference voltage regulating circuit, a bipolar transistor voltage control circuit, a field effect power tube branch gate voltage circuit, a field effect power tube branch gate voltage circuit and a temperature compensation amount regulating circuit, wherein the voltage stabilizing and low pressure difference voltage regulating circuit is used for stabilizing the power supply voltage of a power supply and carrying out voltage regulation following a voltage control circuit automatically when a temperature changes; the bipolar transistor voltage control circuit is used for an automatic control and low pressure difference voltage regulating circuit carries out the corresponding voltage regulation when the temperature changes; the field effect power tube branch gate voltage circuit which is used for providing a grid voltage for an LDMOS field effect power tube and carrying out automatic fine regulation for the working point of the LDMOS field effect power tube when the temperature changes; the gate voltage regulating circuit which is used for carrying out corresponding regulation for the static grid voltage of the LDMOS field effect power tube through a manual mode under an ordinary temperature; the temperature compensation amount regulating circuit which is used for carrying out the corresponding regulation for temperature compensation amount through the manual mode under the ordinary temperature.
Description
Affiliated technical field
The utility model relates to a kind of temperature compensation means that is used to stablize high low temperature intermodulation performance in the power amplifier of mobile communication system (GSM, DCS, CDMA, PCS and IMT-2000) base station and repeater, particularly a kind of high-precision temperature compensation means.
Background technology
In mobile communication base station and repeater power amplifier design, a very crucial index is all arranged: the intermodulation decay.Intermodulation decay is meant that transmitter is to by carrier frequency with produce the inhibition ability of inter-modulated signal in its non-linear components through the interference signal of its antenna input.Wherein, how stablizing high low temperature intermodulation performance then is the technical barrier of industry all the time.In order to satisfy the intermodulation performance requirement of power amplifier under the high and low temperature environment, usually reduce the influence of variations in temperature to intermodulation decay index by temperature compensation act.When temperature change, can cause the skew of quiescent point, and adjust quiescent point by temperature-compensating, make intermodulation performance recover stable.But traditional temperature-compensating mode generally fails to solve the problem of stablizing high low temperature intermodulation performance accurately, and the intermodulation performance under its high low temperature changes all more than 3.5dB.Traditional temperature-compensating mode comprises: the temperature-compensating mode (comprising adopting slow change type PTC thermistor, NTC thermistor or temperature sensitive Z-element to change supply voltage etc.) that 1, changes supply voltage.This mode based on: when the variations in temperature, producing the output drift, is to suppress drift, can make the corresponding increase of supply voltage or reduces, and offsetting or to weaken the influence of variations in temperature to the power amplifier characteristic, thereby reaches the purpose of compensation.After adopting this compensation way compensation, its intermodulation performance changes still more than 3.5dB; And the consistency screening to element needs very strict; Its initial value and temperature coefficient thereof are difficult to coupling; On circuit, still need and adopt auxiliary adjustment measure; 2, parallel temperature-compensating mode.Parallel temperature-compensating mode based on: additional artificially temperature-compensating link, this compensation tache be with in parallel by bucking-out system (or forming link), with offset or the weakening variations in temperature to the influence of power amplifier characteristic, thereby reach the purpose of compensation.After adopting this compensation way compensation, its intermodulation performance changes still more than 3.5dB; And can only accomplish approximate compensation, that is: realize or 3 full compensation at 2, other point can only be " overcompensation " or " undercompensation "; 3, tandem differential temperature compensation way.This mode is " symmetry up and down " structure based on: its compensating circuit, when normal temperature, operating current flows through dividing potential drop branch road up and down, make output voltage equal 1/2 of supply voltage, when temperature changes, though operating current also changes thereupon, output voltage in theory still equals 1/2 of supply voltage, thereby suppresses the drift of intermodulation performance with temperature.After adopting this compensation way compensation, its intermodulation performance changes still more than 3.5dB; And the quiescent output voltage of its compensating circuit is non-vanishing, is zero for making quiescent output voltage, also needs other additional levels shift circuit; 4, reaction type temperature-compensating mode (comprising reaction type symmetry temperature-compensating mode).This mode based on: utilize feedback principle,, that is, quiescent point automatically adjusted with variation of temperature, thereby kept the zero point of its power amplifier and sensitivity not to change in theory with variation of temperature by an automatic adjustment process.After adopting this compensation way compensation, its intermodulation performance changes still more than 3.5dB; And suppress the problem that its intermodulation performance changes with variation of temperature in the time of can only solving the little temperature difference.
Summary of the invention
The purpose of this utility model provides a kind of simple in structure, economical and practical, the temperature compensation means that can effectively stablize the high low temperature intermodulation performance of mobile communication base station and repeater power amplifier, to overcome many shortcomings of above-mentioned traditional all kinds of temperature-compensating modes, make the quiescent point of power amplifier under high low temperature condition, still can fully keep stable and unlikely drift, make its multi-carrier signal be unlikely to fall into the inelastic region of active device, thereby guarantee that its intermodulation performance remains stable under high low temperature condition.
For achieving the above object, the utility model has been constructed temperature compensation means a kind of simple economy, that can stablize the power amplifier intermodulation performance accurately.This device is adjusted circuit 1, double pole triode voltage control circuit 2, field effect power tube grid voltage bleeder circuit 3, temperature compensation compensation rate regulating circuit 4, grid voltage regulating circuit 5 five parts by voltage stabilizing and low dropout voltage and is constituted; Wherein, the input that voltage stabilizing and low dropout voltage are adjusted circuit 1 is connected with power supply, and output is connected with field effect power tube grid voltage bleeder circuit 3, and control end is connected with double pole triode voltage control circuit 2; Its temperature compensation compensation rate regulating circuit 4 is linked into double pole triode voltage control circuit 2, and grid voltage regulating circuit 5 is linked into field effect power tube grid voltage bleeder circuit 3, and field effect power tube grid voltage bleeder circuit 3 is linked into the grid of power amplifier power tube.The effect of its each several part is: voltage stabilizing and low dropout voltage are adjusted circuit 1, are used for the stabilized power supply supply power voltage, and follow following voltage control circuit and carry out the voltage adjustment automatically when variations in temperature; Double pole triode voltage control circuit 2 is used for controlling automatically its above-mentioned voltage stabilizing when variations in temperature and low dropout voltage adjustment circuit carries out the correspondent voltage adjustment; Field effect power tube grid voltage bleeder circuit 3 is used to provide LDMOS merit field effect power tube grid voltage and when variations in temperature automatic fine tuning is carried out in the power tube working point; Grid voltage regulating circuit 5 is used at normal temperatures by manual type the static gate voltage of power tube being carried out corresponding adjusting; Temperature compensation compensation rate regulating circuit 4 is used for by manual type amount of temperature compensation being carried out corresponding adjusting at normal temperatures.
The course of work of the present utility model is: when temperature raises (reduction), the characteristic of LDMOS field effect power tube determines its drain current Id will raise (reduction), and the characteristic of double pole triode determines its base voltage Vb slightly to reduce (slightly improving), thereby make low dropout voltage adjust the corresponding reduction of output voltage (raising) of circuit, reduce (rising) to control its power tube grid voltage Vg, make that Id is corresponding and reduce (increase), promptly recover normal, thereby reach the purpose of temperature-compensating.Wherein, the resistance that changes two resistance up and down of temperature compensation compensation rate regulating circuit can be regulated amount of temperature compensation; Change two resistance up and down of grid voltage regulating circuit and the adjustable range that potentiometer then can change static gate voltage.
Key technology of the present utility model is: used the negative temperature sensitive characteristic of LDMOS pipe and the positive temperature sensitive characteristic of twin-stage type triode rightly, reach the high low temperature complementation between the two, thereby the working point of automatic fine tuning LDMOS power amplifier tube under high low temperature, make it to work in all the time the range of linearity, to realize stablizing the function of high low temperature intermodulation performance.
Experimental results show that, the temperature compensation means of simple economy provided by the utility model is a kind of high-precision temperature compensation means, can reach the effect of stablizing its intermodulation performance significantly in mobile communication base station and repeater power amplifier: in-40-+55 ℃ range of temperature, its intermodulation changes less than 3dB.
The utility model has been constructed temperature compensation means a kind of simple economy, that can stablize the power amplifier intermodulation performance accurately.Can reach the effect of stablizing its intermodulation performance significantly in power amplifier, experimental results show that: in-40-+55 ℃ range of temperature, its intermodulation changes less than 3dB.
The utility model is described in narrative mode all the time, and wherein employed term is intended to describe and unrestricted.According to above description, can make many further modifications to the utility model, also can do many variations according to actual needs.Therefore, in additional claim scope, the utility model can adopt various implementation to specifically described embodiment.
Be the Brief Description Of Drawings of patent of the present invention below the Brief Description Of Drawings:
Fig. 1 is a structured flowchart of the present utility model;
Fig. 2 a is a schematic diagram of the present utility model;
Fig. 2 b is experiment PCB figure of the present utility model.
In above-mentioned accompanying drawing, its description of reference numerals is as follows:
1: voltage stabilizing and low dropout voltage are adjusted circuit; 2: the double pole triode voltage control circuit; 3: field effect power tube grid voltage bleeder circuit; 4: temperature compensation compensation rate regulating circuit; 5: the grid voltage regulating circuit.
The utility model preferred embodiment
Specifically describe corresponding originally in preferred embodiment of the present utility model below in conjunction with accompanying drawing, subordinate list:
With reference to Fig. 1.This figure is simple economy provided by the utility model, the schematic block diagram that can stablize the temperature compensation means of power amplifier intermodulation performance accurately.Wherein, voltage stabilizing and low dropout voltage are adjusted circuit 1, are used for the stabilized power supply supply power voltage, and follow following voltage control circuit and carry out the voltage adjustment automatically when variations in temperature; Double pole triode voltage control circuit 2 is used for controlling automatically its voltage stabilizing when variations in temperature and low dropout voltage is adjusted circuit, to carry out the correspondent voltage adjustment; Field effect power tube grid voltage bleeder circuit 3 is used to provide LDMOS merit field effect power tube grid voltage and when variations in temperature automatic fine tuning is carried out in the power tube working point; Temperature compensation compensation rate regulating circuit 4 is used for by manual type amount of temperature compensation being carried out corresponding adjusting grid voltage regulating circuit at normal temperatures, and grid voltage regulating circuit 5 is used at normal temperatures by manual type the static gate voltage of power tube being carried out corresponding adjusting.
Fig. 2 a and Fig. 2 b represent to be used for stablizing the temperature compensation means schematic diagram of base station and the high low temperature intermodulation performance of repeater power amplifier and the PCB figure of this device thereof respectively.Wherein, the collector electrode of the NPN triode MMBT3904 of voltage control circuit is adjusted circuit with supply power voltage voltage stabilizing and low dropout voltage thereof and is connected, its ground level voltage Vb perseverance at normal temperatures is 0.7V, the input Vin that voltage stabilizing and low dropout voltage are adjusted the voltage-stabilizing device LP2951 of circuit passes through by capacitor C 1, resistance R 8, the capacitance-resistance filter that capacitor C 2 is formed is connected in the 26V power supply, when the 4 pin GND ground connection of LP2951, permanent output 5V, if 4 pin voltages are raised Δ V, then its 1 pin is exported the also corresponding Δ V that raises of Vout, the 4 pin voltage V1 of MMBT3904 control LP2951 are 1.02V during normal temperature, and then the output Vout of LP2951 is 6.02V.This output Vout is connected with power tube grid bleeder circuit by the capacitance-resistance filter of being made up of resistance R 7, capacitor C 3.When temperature raise, the characteristic of field effect transistor determined its drain current Id to raise, and the characteristic of NPN pipe determines its base voltage Vb slightly to reduce, thereby the output Vout of control LP2951 slightly reduces, and then control-grid voltage Vg reduction, Id is reduced, reach the purpose of temperature-compensating.
Can look the power amplifier grid voltage turn-off function that feelings are used LP2951, when the 3 pin Shutdown of LP2951 exceeded 1V than 4 pin, it was output as 0, promptly closed its output, thereby turn-offed the grid voltage in this power amplifier.When it is identical with 4 pin GND voltages, then recover normal output; In this circuit, 4 pin are 1V, so can turn-off grid voltage during for 2V when 3 pin.
In the utility model temperature-compensation circuit, the effect of its LP2951 provides a stable output voltage and carries out the adjustment of low pressure potential difference, if consider cost, then can use the alternative LP2951 of 78L05 voltage-stabilizing device similarly on its function, method be with the reference of 78L05 connect 4 placements of foot of LP2951, the input and output correspondence of 78L05 connects the input and output of LP2951, obtain the also corresponding 6V of being lifted to of output of 78L05 under the normal temperature, therefore can when not requiring the grid voltage turn-off function, can use 78L05 to substitute LP2951 according to the actual functional capability needs.
At normal temperatures, the typical value of the temperature compensation amount control circuit of the utility model temperature-compensation circuit and power amplifier grid voltage dividing potential drop and regulating circuit can be respectively: R1=1K, R2=2.2K, R3=3.3K, R4=3.9K, R5=1K.
Below experiment results of the present utility model is specifically described (referring to subordinate list 1-4).
Table 1, table 2 are by setting up the experimental result that circuit experimentizes and drawn.Wherein, table 1 is not for carrying out the high low temperature intermodulation performance situation of change table under the case of temperature compensation, and table 2 is for adopting high low temperature intermodulation performance situation of change table of the present utility model.But in order to make its experimental result have comparative, used same MRF18090 power amplifier tube in above-mentioned two kinds of experiments, wherein, Vg is a grid voltage, and I is a drain current.
Table 3 is under above-mentioned table 1 and two kinds of situations of table 2, temperature is changed the comparative result of the variation of the intermodulation performance that is drawn in-40 ℃ of-+55 ℃ of scopes.As can be drawn from Table 3 as drawing a conclusion: in the power amplifier of Mobile communication direct base station (or base station), adopt temperature compensation means provided by the utility model, its power amplifier electric current quite stable, its intermodulation performance are all very stable under small-signal or under large-signal.
After the utility model temperature compensation means is adopted in table 4 expression, verify that by experiment its performance to the power amplifier gain can not produce any negative effect.As can be drawn from Table 4 as drawing a conclusion: after in the power amplifier of Mobile communication direct base station (or base station), adopting temperature compensation means provided by the utility model, do not compare with adopting this device, the variation meeting of its gain strengthens a little, but only belong to very little variation, the saltus step problem that step especially can not occur, thus can not constitute influence to the power amplifier overall performance.
Table 1: the high low temperature intermodulation performance situation of change table that does not carry out temperature-compensating
| Temperature (℃) | Static | Every carrier wave 30dBm third order intermodulation (dBm) | Every carrier wave 39dBm third order intermodulation (dBm) | Fixing input Pin=30dBm | ||
| I(A) | Vg(V) | Gain (dB) | Pout | |||
| -40 | 0.35 | 3.90 | -2.40 | 10.00 | 13.40 | 43.40 |
| 0 | 0.51 | 3.85 | -8.60 | 8.30 | 13.00 | 43.00 |
| 25 | 0.65 | 3.83 | -14.60 | 7.60 | 12.80 | 42.80 |
| 55 | 0.81 | 3.70 | -26.50 | 6.60 | 12.50 | 42.50 |
Table 2: adopt high low temperature intermodulation performance situation of change table of the present utility model
| Temperature (℃) | Static | Every carrier wave 30dBm third order intermodulation (dBm) | Every carrier wave 39dBm third order intermodulation (dBm) | Fixing input Pin=30dBm | ||
| I(A) | Vg(V) | Gain (dB) | Pout | |||
| -40 | 0.94 | 3.94 | -20.00 | 4.00 | 13.20 | 43.20 |
| 0 | 0.81 | 3.82 | -21.60 | 2.30 | 12.70 | 42.70 |
| 25 | 0.76 | 3.76 | -22.60 | 3.20 | 12.20 | 42.20 |
| 55 | 0.75 | 3.69 | -23.10 | 4.40 | 11.80 | 41.80 |
Table 3: comparison sheet as a result from-40 ℃ to+55 ℃ of tests under two kinds of situations of table 1 and table 2
Table 4: the table with test results that does not influence the power amplifier gain performance behind checking employing the utility model
Experimentize by setting up circuit, and from its experimental result, can draw: in the power amplifier of Mobile communication direct base station (or base station), adopt temperature compensation means provided by the utility model to have actual using value, and can obtain positive effect as drawing a conclusion.
Claims (7)
1, a kind of high precision temperature compensation device that is used for firm power amplifier intermodulation performance, it is characterized in that: this device is adjusted circuit (1) by voltage stabilizing and low dropout voltage, double pole triode voltage control circuit (2), field effect power tube grid voltage bleeder circuit (3), temperature compensation compensation rate regulating circuit (4), grid voltage regulating circuit (5) five parts constitute; Wherein, the input that voltage stabilizing and low dropout voltage are adjusted circuit (1) is connected with power supply, and output is connected with field effect power tube grid voltage bleeder circuit (3), and control end is connected with double pole triode voltage control circuit (2); Its temperature compensation compensation rate regulating circuit (4) is linked into double pole triode voltage control circuit (2), grid voltage regulating circuit (5) is linked into field effect power tube grid voltage bleeder circuit (3), and field effect power tube grid voltage bleeder circuit (3) is linked into the grid of power amplifier power tube.
2, the high precision temperature compensation device that is used for firm power amplifier intermodulation performance according to claim 1, it is characterized in that: the collector electrode of the NPN triode MMBT3904 of voltage control circuit is adjusted circuit with supply power voltage voltage stabilizing and low dropout voltage thereof and is connected, its ground level voltage Vb perseverance at normal temperatures is 0.7V, the input Vin that supply power voltage voltage stabilizing and low dropout voltage are adjusted the voltage-stabilizing device LP2951 of circuit passes through by capacitor C 1, resistance R 8, the capacitance-resistance filter that capacitor C 2 is formed is connected in the 26V power supply, when the 4 pin GND ground connection of LP2951, the permanent output of typical case 5V, the representative value of the 4 pin voltage V1 of MMBT3904 control LP2951 is 1.02V during normal temperature, it is 6.02V that the typical case of its LP2951 exports Vout, and this output Vout passes through by resistance R 7, the capacitance-resistance filter that capacitor C 3 is formed is connected with power tube grid bleeder circuit.
3, the high precision temperature compensation device that is used for firm power amplifier intermodulation performance according to claim 1, it is characterized in that: resistance R 3, R4, R5 and potentiometer RP1 form power tube grid supply power voltage bleeder circuit, its resistance R 3, potentiometer RP1, resistance R 4 series connection backs are in parallel with resistance R 5, the sliding end 2 of its potentiometer RP1 passes through by capacitor C 4, C5, the capacitance-resistance filter that C6 and resistance R 6 are formed is linked into the power tube grid, resistance R 1, R2 forms the temperature compensation amount control circuit, wherein, R1 is connected with collector electrode with the base stage of triode MMBT3904 respectively, and R2 is connected with grounded emitter with the base stage of triode MMBT3904 respectively.
4, the high precision temperature compensation device that is used for firm power amplifier intermodulation performance according to claim 1, it is characterized in that: at normal temperatures, the typical value of temperature compensation amount control circuit and power amplifier grid voltage dividing potential drop and grid voltage regulating circuit can be respectively: R1=1K, R2=2.2K, R3=3.3K, R4=3.9K, R5=1K, its each voltage typical case measured value is respectively: Vin=14V, Vb=0.7V, V1=1.0V, V2=3.95V, V3=3.38V, regulate 1K potentiometer RP1, make grid voltage adjustable between 3.38V-3.95V.
5, the high precision temperature compensation device that is used for firm power amplifier intermodulation performance according to claim 1, it is characterized in that: in case of necessity, can use the power amplifier grid voltage turn-off function of LP2951, during normal temperature, 4 pin of this circuit are 1V, when the 3 pin Shutdown of LP2951 are 2V, it is output as 0, promptly closes output, thereby turn-offs the grid voltage in the power amplifier, when 3 pin are identical with 4 pin GND voltages, then recover normal output.
6, the high precision temperature compensation device that is used for firm power amplifier intermodulation performance according to claim 1, it is characterized in that: in temperature-compensation circuit provided by the utility model, if consider cost, when not requiring the grid voltage turn-off function, then can be used on similarly 78L05 voltage stabilizing and the alternative LP2951 of low-voltage difference adjustor spare on its function, method be with the reference of 78L05 connect 4 placements of foot of LP2951, the input and output correspondence of 78L05 connects the input and output of LP2951, during normal temperature, the also corresponding 6V that is lifted to of the output of its 78L05.
7, the high precision temperature compensation device that is used for firm power amplifier intermodulation performance according to claim 4, it is characterized in that: described temperature compensation amount control circuit and power amplifier grid voltage dividing potential drop and the grid voltage regulating circuit typical value when normal temperature, when this temperature-compensation circuit is used for the power amplifier of different occasions, its R1 when normal temperature, R2, R3, R4, R5 needs to adjust accordingly according to the actual needs of different capacity amplifier, its magnitude of voltage Vin, Vb, V1, V2, V3 is also corresponding to adjustment, and regulate the RP1 potentiometer simultaneously, grid voltage is remained within the respective range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420112458 CN2762436Y (en) | 2004-11-08 | 2004-11-08 | High precision temp.-compensation device for stabilizing intermodulation performance of power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420112458 CN2762436Y (en) | 2004-11-08 | 2004-11-08 | High precision temp.-compensation device for stabilizing intermodulation performance of power amplifier |
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| CN2762436Y true CN2762436Y (en) | 2006-03-01 |
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| CN 200420112458 Expired - Fee Related CN2762436Y (en) | 2004-11-08 | 2004-11-08 | High precision temp.-compensation device for stabilizing intermodulation performance of power amplifier |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297537A (en) * | 2014-10-27 | 2015-01-21 | 上海原动力通信科技有限公司 | Power amplifier grid voltage adjusting device and method |
| CN107483022A (en) * | 2017-08-15 | 2017-12-15 | 湖南时变通讯科技有限公司 | A kind of temperature-compensation circuit |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
| CN117908628A (en) * | 2024-03-19 | 2024-04-19 | 成都天成电科科技有限公司 | Temperature compensation circuit |
| CN117908628B (en) * | 2024-03-19 | 2024-05-24 | 成都天成电科科技有限公司 | Temperature compensation circuit |
-
2004
- 2004-11-08 CN CN 200420112458 patent/CN2762436Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297537A (en) * | 2014-10-27 | 2015-01-21 | 上海原动力通信科技有限公司 | Power amplifier grid voltage adjusting device and method |
| CN107483022A (en) * | 2017-08-15 | 2017-12-15 | 湖南时变通讯科技有限公司 | A kind of temperature-compensation circuit |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
| CN117908628A (en) * | 2024-03-19 | 2024-04-19 | 成都天成电科科技有限公司 | Temperature compensation circuit |
| CN117908628B (en) * | 2024-03-19 | 2024-05-24 | 成都天成电科科技有限公司 | Temperature compensation circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060301 Termination date: 20121108 |