CN202906840U - Circuit capable of avoiding radio frequency power amplifier collector electrode or drain electrode power control saturation failure - Google Patents
Circuit capable of avoiding radio frequency power amplifier collector electrode or drain electrode power control saturation failure Download PDFInfo
- Publication number
- CN202906840U CN202906840U CN 201220280901 CN201220280901U CN202906840U CN 202906840 U CN202906840 U CN 202906840U CN 201220280901 CN201220280901 CN 201220280901 CN 201220280901 U CN201220280901 U CN 201220280901U CN 202906840 U CN202906840 U CN 202906840U
- Authority
- CN
- China
- Prior art keywords
- power control
- control circuit
- drain electrode
- grid
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a circuit capable of avoiding radio frequency power amplifier collector electrode or drain electrode power control saturation failure. A P-channel metal oxide semiconductor (PMOS) pass transistor of a diode is connected between a grid electrode and a drain electrode in a power control circuit in a bridge joint mode. When output voltage to current converter (VCC) of the power control circuit is high, the PMOS pass transistor with the diode is capable of avoiding influence on response speed caused by the fact that the pass transistor and circuits in an error amplifier enter into a linear region because of low grid voltage. Due to the fact that a normal working condition from beginning to end of the error amplifier and the pass transistor is guaranteed, when output voltage of the power control circuit is jumped from high voltage to low voltage, the response speed of the circuit is faster.
Description
Technical field
The utility model relates to a kind of quick response and can avoid radio-frequency power amplifier collector electrode or drain electrode power to control the circuit of saturated inefficacy, the response time when this circuit can shorten power control circuit and jumps to low output voltage by high output voltage.
Technical background
In the radio-frequency power amplifier that adopts collector electrode or drain electrode control mode, power control circuit is realized power control by collector electrode or the drain power voltage of power ratio control amplifier.The peak power output of radio-frequency power amplifier need to be according to environment, and strong and weak grade of radiofrequency signal carried out real-time adjustment.Also the required power amplifier can turn-off and conducting fast in the shutoff of power amplifier and turn on process.Therefore require power control circuit to have faster response speed.In common collector electrode control circuit shown in Figure 1, power control is by power control circuit output voltage V cc is fed back to the in-phase input end of error amplifier OP, the reference voltage Vref of the anti-phase input termination outside of error amplifier OP through linear feedback network F.The output voltage control PMOS of error amplifier adjusts the grid voltage of pipe M1.By linear feedback network F, error amplifier OP adjusts the control loop of pipe M1 formation so that Vcc and Vref are linear.But when power amplifier was positioned at maximum power output, Vcc voltage reached maximum, and the grid voltage of adjusting pipe can be driven into a very low value by error amplifier, and adjust pipe and can be operated in linear zone this moment.The output voltage that error amplifier is excessively low makes its output stage transistor enter linear zone easily, causes the gain degradation of amplifier.This moment, the loop gain of circuit was very low, can think that feedback control loop disconnects, so just so that Vref has lost the control to Vcc, unless error amplifier and adjustment pipe return to normal state.And circuit returns to the time that magnifying state generally need to be long from linear zone, and shown in the curve 1 among Fig. 4, this can seriously influence the response time of power control circuit.This power control circuit is owing to the too high saturated inefficacy that causes the slack-off effect of response speed to be called power control circuit of output.
Take MOSFET (such as LDMOS etc.) in the power amplifier of amplifier tube, can come by the drain voltage of control amplifier tube the size of saturation output power, this and collector electrode controls similar Poewr control method and is called the control of drain electrode power, and the saturated Problem of Failure that exists in the above Power of collector control is present in the power control circuit that drains equally.
Summary of the invention
The problem that the utility model solves is to overcome common collector electrode or drain power control circuit when high output voltage, the problem of the saturated inefficacy of power control circuit.
The technical scheme that its technical problem that solves the utility model adopts is: the adjustment pipe that adopts cross-over connection diode between grid and the drain electrode in power control circuit.One or more clamp diodes in the power control circuit are connected in series and are connected across between the grid and drain electrode of adjusting pipe, and the anode of diode links to each other with the drain electrode that PMOS adjusts pipe, and the negative terminal of diode links to each other with the grid that PMOS adjusts pipe.Utilize the clamping action of diode, when the output voltage of power control circuit was very high, the grid voltage that clamp diode will be adjusted pipe is the output voltage clamper of error amplifier namely, avoids it to drop to very low voltage.By the output voltage range of restraining error amplifier, avoid output voltage error amplifier to drop to very low level, avoid circuit to enter linear zone work, thereby accelerated the response speed of power control circuit.
The beneficial effects of the utility model are: can accelerate the response speed of collector electrode or drain electrode power control circuit, avoid saturated inefficacy
The utility model can be used for adopting the radio-frequency power amplifier of Power of collector control or the control of drain electrode power.
Description of drawings
Below in conjunction with drawings and Examples the utility model is done further detailed explanation:
Fig. 1 is collector electrode or the drain electrode power control circuit of existing power amplifier.
Fig. 2 is power amplifier collector electrode or the drain electrode power control circuit in the utility model.
Fig. 3 is an embodiment of power amplifier Power of collector control circuit of the present utility model.
Fig. 4 is the response curve of the utility model and existing power control circuit.
Embodiment
The utility model provides a kind of method of accelerating radio-frequency power amplifier collector electrode or drain electrode power control circuit response speed, by increase diode between the grid of the adjustment pipe of power control circuit and drain electrode.Utilize the clamping action of diode, when power control circuit is exported higher voltage, the clamp diode conducting, to adjust the gate-voltage limit of pipe at a suitable level, guarantee that adjustment pipe and error amplifier internal circuit are in the saturation region, thereby the guaranteed output control circuit still has preferably response speed under higher output voltage, the response curve of its power control circuit such as the curve among Fig. 42.Can see that its response time obviously reduces than the curve 1 that does not adopt clamp diode.
A circuit theory of the present utility model as shown in Figure 2.Power control circuit is by feedback network F, and error amplifier OP, PMOS adjust pipe M1, and clamp diode D1～Dn consists of.The input termination power control circuit output voltage V cc of feedback network F, the output voltage of feedback network F connects homophase input as the end of error amplifier OP, the anti-phase input termination reference voltage Vref of error amplifier OP, the output voltage of error amplifier OP connects the grid of adjusting pipe M1, the drain electrode of adjusting pipe M1 is the output voltage V cc of power control circuit, and the source electrode of adjusting pipe M1 is cell voltage VBAT.What diode D1～Dn was end to end is connected across between the grid and drain electrode of adjusting pipe M1.The wherein drain electrode of the positive termination adjustment pipe M1 of Dn, the negative terminal of D1 connect the grid of adjusting pipe M1.The output voltage V cc of power control circuit is as the power output of collector electrode or the drain power voltage control power amplifier of power amplifier.As shown in Figure 2 when the Vcc of control circuit output is very high, because the clamping action of D1～Dn, the output voltage of error amplifier is minimum can not to be lower than the forward conduction voltage drop that Vcc deducts n diode, the scope that the number by adjusting diode can the departure amplifier output voltage.Here need to guarantee that output voltage error amplifier was unlikely low so that error amplifier enters the low gain district, the number of diode can not be very little simultaneously, otherwise it is too small that error amplifier is exchanged the grid voltage control range of homogeneous tube, is difficult to obtain maximum electric current output.
An embodiment of the present utility model as shown in Figure 3.Power amplifier is by amplifier tube Q1, capacitance C1, and C2, biasing circuit Rb, and emitter impedance Ze and collector impedance Zc consist of.Amplifier tube Q1 can be the devices such as triode, GaAs, HBT, LDMOS.Wherein for bipolar device such as triode, GaAs, HBT, the power control mode among the figure are Power of collector control.For MOS device such as LDMOS, its control mode is the control of drain electrode power.C1 is the input capacitance in the power amplifier, and two ends connect respectively the base stage of input radio frequency signal RFin and amplifier tube Q1; C2 is the output capacitance, and two ends meet respectively collector electrode and the radio frequency output RFout of amplifier tube Q1; The effect of biasing resistor Rb is isolation base bias circuit and input radio frequency signal, and its two ends connect respectively the base stage of base bias voltage and amplifier tube Q1; The transmitter of amplifier tube Q1 is connected to the ground by impedance Z e, and the emitter of Q1 links to each other with the output voltage V cc of power control circuit by impedance Z c, and Zc is made of inductance usually.The feedback network of power control circuit is made of divider resistance R1 and R2, the intermediate voltage of R1 and R2 connects homophase input as the end of error amplifier OP, the anti-phase input termination reference voltage Vref of error amplifier OP, the output voltage of error amplifier OP connects the grid of adjusting pipe M1, the drain electrode of adjusting pipe M1 is the output voltage V cc of power control circuit, and the source electrode of adjusting pipe M1 is cell voltage VBAT.Adopt the mode of three diode series connection among the figure, what diode D1～D3 was end to end is connected across between the grid and drain electrode of adjusting pipe M1.The wherein drain electrode of the positive termination adjustment pipe M1 of D3, the negative terminal of D1 connect the grid of adjusting pipe M1.The output voltage V cc of power control circuit is as the power output of the collector supply voltage power ratio control amplifier of power amplifier.If cell voltage is 3.3V, the maximum output voltage of Vcc is 3.1V, and then in the situation that three clamp diodes are arranged, the conduction voltage drop of each diode is about 0.7V, and the output voltage of error amplifier will can not be lower than 3.1-3 * 0.7=1V so.For the error amplifier of common 3.3V voltage, the 1V output voltage is enough to guarantee that the output stage of error amplifier can not enter linear zone.Therefore error amplifier can be positioned at the state of normal amplification all the time.Fig. 4 has shown the response curve of the utility model and existing power control circuit.Curve 1 is the response curve of existing power control circuit among the figure, and curve 2 is that power control circuit of the present utility model is starved response curve.Axis of abscissas represents the time, and axis of ordinates represents the output voltage V cc of power control circuit.Show among the figure when Vcc by high voltage during to the low-voltage saltus step, the response time of existing power control circuit is t1, the response time here be defined as from output voltage V cc saltus step begin the time be carved into output voltage V cc and reach and stablize the required time.The response time of power control circuit of the present utility model is t2.The response time t2 of power control circuit of the present utility model is less than the response time t1 of existing power control circuit.The beneficial effects of the utility model are to adopt the method that connects diode between the grid of the adjustment pipe in power control circuit and the drain electrode to avoid power control circuit internal circuit when output HIGH voltage to enter linear zone, the saturated Problem of Failure of the power control circuit of the common existence of avoiding.Improved the response speed of power control circuit under the high output voltage.
Claims (3)
1. avoid radio-frequency power amplifier collector electrode or drain electrode power to control the circuit of saturated inefficacy for one kind, it is characterized in that adopting the adjustment pipe of the one or more series diodes of cross-over connection between grid and drain electrode, when the power control circuit output HIGH voltage, will adjust the grid voltage clamper of pipe, and avoid adjusting the tube grid brownout and cause adjustment pipe and error amplifier to enter linear zone.
2. the power control circuit of radio-frequency power amplifier according to claim 1 is characterized in that power control circuit adjusts pipe by the PMOS with clamp diode between the grid leak, and feedback network and error amplifier consist of.
3. the power control circuit of radio-frequency power amplifier according to claim 1, it is characterized in that the several clamp diodes in the power control circuit are connected in series and are connected across between the grid and drain electrode of adjusting pipe, the anode of diode links to each other with the drain electrode that PMOS adjusts pipe, and the negative terminal of diode links to each other with the grid that PMOS adjusts pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220280901 CN202906840U (en) | 2012-06-13 | 2012-06-13 | Circuit capable of avoiding radio frequency power amplifier collector electrode or drain electrode power control saturation failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220280901 CN202906840U (en) | 2012-06-13 | 2012-06-13 | Circuit capable of avoiding radio frequency power amplifier collector electrode or drain electrode power control saturation failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202906840U true CN202906840U (en) | 2013-04-24 |
Family
ID=48127458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220280901 Expired - Lifetime CN202906840U (en) | 2012-06-13 | 2012-06-13 | Circuit capable of avoiding radio frequency power amplifier collector electrode or drain electrode power control saturation failure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202906840U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196613A (en) * | 2017-04-17 | 2017-09-22 | 锐迪科微电子（上海）有限公司 | A kind of power amplifier for realizing overvoltage protection |
| CN110166009A (en) * | 2019-04-30 | 2019-08-23 | 思瑞浦微电子科技（苏州）股份有限公司 | Input voltage-withstanding protection architecture |
-
2012
- 2012-06-13 CN CN 201220280901 patent/CN202906840U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196613A (en) * | 2017-04-17 | 2017-09-22 | 锐迪科微电子（上海）有限公司 | A kind of power amplifier for realizing overvoltage protection |
| CN110166009A (en) * | 2019-04-30 | 2019-08-23 | 思瑞浦微电子科技（苏州）股份有限公司 | Input voltage-withstanding protection architecture |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101882860B (en) | Insulated gate bipolar translator (IGBT) drive and protection circuit | |
| CN106160428B (en) | A kind of IGBT parallel current-equalizing circuit and control method | |
| CN103138690A (en) | Circuit capable of conducting power compensation through bias current in radio frequency power amplifier | |
| US11133786B2 (en) | Radio frequency power amplifier module having high linearity and power-added efficiency and implementation method | |
| CN206432960U (en) | A kind of GaN microwave power amplifiers protection circuit | |
| CN104682898A (en) | Active bias circuit for power amplifier and communication equipment | |
| CN102208800A (en) | Adaptive insulated gate bipolar transistor (IGBT) series-connection voltage-sharing circuit with overcurrent protection function | |
| CN106357226A (en) | Power amplification module | |
| CN106788368A (en) | For the driver of P-channel MOSFET | |
| CN102769433A (en) | Radio-frequency power amplifier power control circuit utilizing NMOS (N-channel metal oxide semiconductor field-effect transistor) regulating tube | |
| CN106505952B (en) | A kind of Pulsed Solid State power amplifier and design method | |
| WO2019019494A1 (en) | Bias circuit and power amplification circuit | |
| CN203261299U (en) | Gain adjusting circuit of radio frequency power amplifier | |
| CN207910737U (en) | Power amplifier module | |
| CN102100000A (en) | Vswr compensation circuits for RF transmit chain | |
| CN202906840U (en) | Circuit capable of avoiding radio frequency power amplifier collector electrode or drain electrode power control saturation failure | |
| CN105375985A (en) | Light receiving circuit and LIGHT COUPLING DEVICE | |
| CN110034737A (en) | Power amplification circuit | |
| CN103762948A (en) | Complementary metal-oxide-semiconductor transistor (CMOS) radio frequency power amplifier integrated on system on chip | |
| US20230421123A1 (en) | Power amplifier and control method | |
| CN109450395B (en) | Nonlinear feedback circuit and low noise amplifier using same | |
| CN102647163A (en) | Variable gain amplifier circuit | |
| CN103580619A (en) | Power amplifying device and linear adjuster | |
| CN105071673A (en) | Switch power supply magnetic isolation feedback circuit based on reference source 431 | |
| CN103326675A (en) | Linear radiofrequency power amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGZHOU HUIZHI MICROELECTRONIC CO., LTD. Free format text: FORMER OWNER: GUO YAOHUI Effective date: 20140306 |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140306 Address after: 510663 innovation building, C2-307, science Avenue, Science Town, Guangzhou hi tech Industrial Development Zone, Guangdong 182, China Patentee after: Guangzhou Huizhi Microelectronic Co., Ltd. Address before: Long road Guangzhou City, Guangdong province 510663 Luogang District No. 300 101. Patentee before: Guo Yaohui |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |
|
| CX01 | Expiry of patent term |