CN103684278A - Biasing circuit of power amplifier - Google Patents
Biasing circuit of power amplifier Download PDFInfo
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- CN103684278A CN103684278A CN201310409672.3A CN201310409672A CN103684278A CN 103684278 A CN103684278 A CN 103684278A CN 201310409672 A CN201310409672 A CN 201310409672A CN 103684278 A CN103684278 A CN 103684278A
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- temperature
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Abstract
The invention relates to the technical field of power amplifiers, in particular to a temperature compensation circuit, playing a role in stabilizing gains, of a power amplifier. By means of the temperature compensation circuit of the power amplifier, on the basis that high linearity and high efficiency are achieved, the power amplifier has good temperature characteristic indexes within the whole temperature changing range.
Description
Technical field
The present invention relates to power amplifier technical field, specifically refer to a kind of compensating temperature of power amplifier circuit with constant gain effect.
Background technology
Power amplifier is as the critical component in various wireless telecommunication system transmitters, each communication standard all has strict demand to its indices, increase along with volume of transmitted data, current 3G/4G standard has proposed more harsh requirement to power amplifier, on high linearity, high efficiency basis, also require power amplifier in whole range of temperature, to there is good temperature characterisitic index.
GaAs heterojunction device (GaAs HBT) is a kind of radio-frequency devices with high linearity and high efficiency performance, be widely used in the linear power amplifier design in mobile communication system, but there is relatively large deviation by the performance of the power amplifier of GaAs HBT device design in Bian at present under different temperatures, because variations in temperature can cause the knot pressure drop of power transistor and multiplication factor and change, thereby cause the gain temperature influence of power amplifier and have larger variation.For a typical secondary power amplifier, its gain variation with temperature is conventionally at 23dB, it is very large that this can cause using the handheld device performance of this power amplifier to vary with temperature deviation, in order to compensate this aberrations in property, this deviation producing with regard to needing Bian to come the gain of compensating power amplifier to vary with temperature with technique for temperature compensation.In current compensating temperature of power amplifier technology, mainly concentrate on the biasing circuit and the Bian use that design with temperature-compensating and realize temperature-compensating with the source voltage control circuit of temperature-compensating.As shown in fig. 1.Bias voltage Vref is not temperature variant constant pressure source.Diode Q1, Q2 produces a junction voltage of following the tracks of Q4 temperature.By choosing the value of suitable Vref and R1, can, so that the bias current of Q4 obtains suitable temperature coefficient, guarantee that the gain of power amplifier and power output do not vary with temperature.But the circuit of Fig. 1 can only normally be worked in less temperature range.Under extreme temperature conditions, cause sometimes the too low situation about can not normally open of Q4 bias current.
Summary of the invention
The present invention proposes a kind of constant voltage power supply circuit with minimum output current protection, can avoid the appearance of above-mentioned situation, thereby make power amplifier in whole range of temperature, there is good temperature characterisitic index
The constant voltage power supply circuit that the minimum output current that the present invention adopts a kind of operational amplifier of use three inputs to realize is protected.PM2 in saving dotted line frame, when PM11 and RFI, Fig. 2 institute thing circuit is a kind of typical LDO stabilized voltage power supply, the V1 of output voltage V ref=(m+1)
The PM11 newly increasing and efferent duct PM10 form the current mirror of 1:n.Therefore the output current of PM11
If?=?Io/n
VFI?=?If*RFI?=?(Io*RFI)/n
When VFI>VFV, PM2 cut-off, shown in circuit with normally stabilized voltage power supply work is identical.
When VFI<VFV, PM2 conducting, PM1 cut-off, shown in the output of circuit will become constant-current source from constant pressure source.Output current Io=n*If=n*V1/RFI. just means that output current will can not be worth lower than this.
Accompanying drawing explanation
Fig. 1 is traditional bias circuit of power amplifier figure; Fig. 2 is a kind of implementation figure of the present invention; Fig. 3 is biasing circuit output voltage and the electric current variation with temperature figure without minimum current protection; Fig. 4 is output voltage and the electric current variation with temperature figure with the biasing circuit of minimum current protection.
Embodiment
In order to solve the problems of the technologies described above, the present invention relates generally to the constant voltage power supply circuit that adopts the minimum output current protection that a kind of operational amplifier of use three inputs realizes.
PM2 in saving dotted line frame, when PM11 and RFI, circuit shown in Fig. 2 is a kind of typical LDO stabilized voltage power supply.Bias current sources and PM0, PM1, NM0, NM1, NM10, NM11, PM10 and PM11 form a typical two-stage calculation amplifier.The PM12 that its output drives produces VREF and powers to external circuit, and resitstance voltage divider m*RFV and feedback voltage V FV of RFV generation and input signal V1 drive the input of operational amplifier jointly.When loop gain is very high, the error between VFV and V1 is very little, and output voltage V ref=(m+1) V1 is not temperature variant constant voltage, as shown in Figure 3A.
Because the cut-in voltage of HBT rises and declines with temperature, therefore under above-mentioned constant bias voltage effect, the bias current of power amplifier rises with temperature, as shown in the solid line in Fig. 3 B.Thereby the problem that the gain that has compensated power amplifier declines with temperature.But the variation due to technological parameter, the HBT cut-in voltage of some product batches is too high, cause the HBT cut-in voltage of VREF and twice under low temperature to be more or less the same, bias current sharply declines, thereby power amplifier power output when low temperature is significantly reduced, situation about even can not open, as shown in dotted line in Fig. 3 B.Affected by this, cause power amplifier decrease in yield, product cost rises.
In the present invention, the PM11 newly increasing and efferent duct PM10 form the current mirror of 1:n.When VFI<VFV, PM1 cut-off, PM2 conducting, circuit enters current working mode.Under the high-gain condition providing at operational amplifier, VFI=V1.Therefore the output current of PM11
If?=V1/RFI=?Io/n
Therefore, output current Io=n*If=n*V1/RFI.
As shown in Figure 4, when low temperature, circuit enters current feedback pattern, and under this pattern, circuit output current IBIAS is stabilized in n*V1/RFI, do not vary with temperature, though output voltage V REF temperature decline and rise.Thereby guaranteed that the bias current of power amplifier when low temperature is not less than set point, thereby normally worked.
In such scheme, the constant voltage power supply circuit of the minimum output current protection that the operational amplifier that adopts a kind of use three to input is realized is the emphasis of this invention.
In sum, the present invention has the following advantages:
(1), biasing circuit output current can not guarantee that power amplifier can not cause because bias current is too low cut-off under extreme temperature lower than n*V1/RFI, the situation of inactivity output.
(2), with respect to other temperature-compensation circuits, the present invention adopts closed-loop control, guarantees that bias current is not less than certain value, reliability is higher.
(3), with respect to other temperature-compensation circuits, the present invention is simple in structure, cost is lower.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (2)
1. compensating temperature of power amplifier circuit, is characterized in that having realized on high linearity, high efficiency basis, has good temperature characterisitic index in the whole range of temperature of power amplifier.
2. the temperature-compensation circuit of the constant voltage power supply circuit of protecting with minimum output current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310409672.3A CN103684278A (en) | 2013-09-11 | 2013-09-11 | Biasing circuit of power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310409672.3A CN103684278A (en) | 2013-09-11 | 2013-09-11 | Biasing circuit of power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103684278A true CN103684278A (en) | 2014-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310409672.3A Pending CN103684278A (en) | 2013-09-11 | 2013-09-11 | Biasing circuit of power amplifier |
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| CN (1) | CN103684278A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026932A (en) * | 2015-03-30 | 2016-10-12 | 株式会社村田制作所 | Power amplifier module |
| CN109688514A (en) * | 2018-12-26 | 2019-04-26 | 上海艾为电子技术股份有限公司 | A kind of high-voltage digital audio power amplification system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6242976B1 (en) * | 1999-06-09 | 2001-06-05 | Space Systems/Loral, Inc. | Low cost linearized channel amplifier for use with high power amplifiers |
| CN101478293A (en) * | 2008-12-02 | 2009-07-08 | 锐迪科微电子（上海）有限公司 | Temperature compensation power amplifier circuit |
| CN201571021U (en) * | 2010-01-18 | 2010-09-01 | 惠州市正源微电子有限公司 | Power amplifier biasing circuit with temperature compensation function |
| CN201878097U (en) * | 2010-11-17 | 2011-06-22 | 深圳市国人射频通信有限公司 | Power amplification grid voltage temperature compensation circuit and radiofrequency power amplifier |
| CN102625540A (en) * | 2012-03-31 | 2012-08-01 | 浙江西盈科技有限公司 | Temperature compensation type dimming circuit and method for LED (Light Emitting Diode) illuminating lamp |
-
2013
- 2013-09-11 CN CN201310409672.3A patent/CN103684278A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6242976B1 (en) * | 1999-06-09 | 2001-06-05 | Space Systems/Loral, Inc. | Low cost linearized channel amplifier for use with high power amplifiers |
| CN101478293A (en) * | 2008-12-02 | 2009-07-08 | 锐迪科微电子（上海）有限公司 | Temperature compensation power amplifier circuit |
| CN201571021U (en) * | 2010-01-18 | 2010-09-01 | 惠州市正源微电子有限公司 | Power amplifier biasing circuit with temperature compensation function |
| CN201878097U (en) * | 2010-11-17 | 2011-06-22 | 深圳市国人射频通信有限公司 | Power amplification grid voltage temperature compensation circuit and radiofrequency power amplifier |
| CN102625540A (en) * | 2012-03-31 | 2012-08-01 | 浙江西盈科技有限公司 | Temperature compensation type dimming circuit and method for LED (Light Emitting Diode) illuminating lamp |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026932A (en) * | 2015-03-30 | 2016-10-12 | 株式会社村田制作所 | Power amplifier module |
| CN106026932B (en) * | 2015-03-30 | 2021-01-12 | 株式会社村田制作所 | Power amplifying module |
| CN109688514A (en) * | 2018-12-26 | 2019-04-26 | 上海艾为电子技术股份有限公司 | A kind of high-voltage digital audio power amplification system |
| CN109688514B (en) * | 2018-12-26 | 2023-09-15 | 上海艾为电子技术股份有限公司 | High-voltage digital audio power amplifier system |
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Application publication date: 20140326 |