CN202374224U - Variable gain self-adaption bias power amplifier based on common-mode feedback - Google Patents
Variable gain self-adaption bias power amplifier based on common-mode feedback Download PDFInfo
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- CN202374224U CN202374224U CN2011205487171U CN201120548717U CN202374224U CN 202374224 U CN202374224 U CN 202374224U CN 2011205487171 U CN2011205487171 U CN 2011205487171U CN 201120548717 U CN201120548717 U CN 201120548717U CN 202374224 U CN202374224 U CN 202374224U
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Abstract
The utility model discloses a variable gain self-adaption bias power amplifier based on common-mode feedback, which comprises radio frequency (RF) input signals, an envelope detection module, a bias voltage control module, an operational amplifier module and a signal output module. An input end of the envelope detection module is connected with the RF input signals, and an output end is connected with the operational amplifier module; the bias voltage control module is connected with the operational amplifier module; and an input end of the signal output module is connected with the operational amplifier module and the RF input signals, and an output end is connected with an input end of a power amplifier (PA). According to the variable gain self-adaption bias power amplifier, the problem that the path delay of self-adaption bias circuit affects the performance of the PA in the prior art is solved; and as the variable gain amplifier with high bandwidth stacks envelope detection values on direct current bias, the variable gain amplifier can not only achieve the stack of the direct current bias and envelope signals, but also be used for adjusting the size of the envelope signals, and achieve effective compensation of linearity of the PA.
Description
Technical field
The utility model has related to a kind of power amplifier, and the adaptive-biased power amplifier of especially a kind of variable gain based on common-mode feedback belongs to the semiconductor integrated circuit design field.
Background technology
Along with radio communication and IC industry constantly develop, the SOC system of monolithic integrated RF and base band algorithm is owing to advantages such as integrated level is high, and area is little, and cost is low more and more receive the welcome of entire machine design manufacturer.In the SOC system design, along with CMOS technology characteristics size constantly to reduce its advantage on area and cost more and more obvious.Become the core competitiveness place of each IC Chevron Research Company (CRC) based on the SOC system of CMOS technology.Yet (supply voltage, non-linear, parasitic capacitance, substrate coupling and loss etc.) become the bottleneck place of SOC system because the restriction of CMOS technology self character based on PA design on the sheet of CMOS technology.
For communicating by letter of the effective utilization that realizes bandwidth and big data transfer rate, modern wireless communication systems has adopted the modulation system of various complicacies, and the difference of modulation system is also different to the PA performance requirement.See that from the radio frequency design angle modulation system probably can be divided into permanent envelope modulation and become envelope modulation.Become the envelope modulation mode and comprise 8/16/32/64-QAM, QPSK, OQPSK etc.Carry information owing to become in the envelope modulation mode envelope, so need the higher category-A PA of the linearity that it is amplified.But class-a amplifier often conversion efficiency is low, and realizes that at CMOS arts demand under the 3.3V supply voltage situation power output more than the 10dBm is difficult to guarantee high linearity.
The utility model content
The utility model technical problem to be solved has provided the adaptive-biased power amplifier of a kind of variable gain based on common-mode feedback; According to the high bandwidth variable gain amplifier envelope detected value is superimposed upon the method on the direct current biasing; This variable gain amplifier not only can be used for realizing the stack of direct current biasing and envelope signal; Can also be used to regulating the size of envelope signal simultaneously, realize the more effective compensation of the PA linearity.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopted is:
The adaptive-biased power amplifier of a kind of variable gain based on common-mode feedback; Comprise the RF input signal; Also comprise envelope detected module, bias voltage control module, amplifier module and signal output module; The input of said envelope detected module is connected with the RF input signal, and output is connected with the amplifier module; Said bias voltage control module is connected with said amplifier module; The input of said signal output module is connected with the RF input signal with the amplifier module, and output connects the PA input.
The adaptive-biased power amplifier of aforesaid variable gain based on common-mode feedback; It is characterized in that: said amplifier module comprises operational amplifier OP1; Said envelope detected module is connected with the in-phase input end of operational amplifier OP1 through the first variable resistor R1, is connected with the second adjustable resistance R2 between in-phase input end and the inverse output terminal; DC power supply Vdc is connected with the reverse input end of operational amplifier OP1 through the 3rd variable resistor R3, is connected with the 4th variable resistor R4 between in-phase output end and the reverse input end.
The adaptive-biased power amplifier of aforesaid variable gain based on common-mode feedback; It is characterized in that: said envelope detected circuit comprises two metal-oxide-semiconductors; The drain electrode of said two metal-oxide-semiconductors all connects direct voltage VDD, and grid all connects local oscillation signal, and source electrode all connects ground connection behind first constant-current source; The source electrode of two metal-oxide-semiconductors is connected with said amplifier module after connecting the RC filter circuit.
The adaptive-biased power amplifier of aforesaid variable gain based on common-mode feedback; It is characterized in that: said bias voltage control module comprises the 3rd metal-oxide-semiconductor; The drain and gate of said the 3rd metal-oxide-semiconductor connects second constant-current source; Source ground, grid is connected with said amplifier module, is connected with first capacitor C 1 between source electrode and the grid.
The adaptive-biased power amplifier of aforesaid variable gain based on common-mode feedback; It is characterized in that: said output module comprises second metal-oxide-semiconductor; The grid of said second metal-oxide-semiconductor connects the output of RF input signal and amplifier module, source ground, and drain electrode connects the PA input.
The beneficial effect of the utility model is following:
1, bias voltage increases with the increase of input signal envelope;
2, on the basis of identical power output, the linearity that adopts the dynamic bias method to obtain obviously is superior to fixed bias;
3, compare with the fixed bias of identical gain compression point, dynamic bias has only part-time to be biased in the maximum current value, can reduce the PA power consumption, improves its efficient;
4, owing to adopted dynamic bias, the current drain under the low output of the PA energy situation is starkly lower than the current drain under the high power output situation.
Description of drawings
Fig. 1 is the variable gain adaptive bias circuit sketch map of the utility model based on common-mode feedback;
Fig. 2 is the utility model envelope detected modular circuit structural representation.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.Following examples only are used for more clearly explaining the technical scheme of the utility model, and can not limit the protection range of the utility model with this.
As shown in Figure 1; The adaptive-biased power amplifier of a kind of variable gain based on common-mode feedback; Comprise RF input signal Vrf_in, envelope detected module, bias voltage control module 1, amplifier module 2 and signal output module 3; The input of said envelope detected module is connected with RF input Vrf_in signal, and output is connected with amplifier module 2; Said bias voltage control module 3 is connected with said amplifier module 2; The input of said signal output module 3 is connected with RF input signal Vrf_in with amplifier module 2, and output connects the PA input.
Said amplifier module 2 comprises operational amplifier OP1, and said envelope detected module is connected with the in-phase input end of operational amplifier OP1 through the first variable resistor R1, is connected with the second adjustable resistance R2 between in-phase input end and the inverse output terminal; DC power supply Vdc is connected with the reverse input end of operational amplifier OP1 through the 3rd variable resistor R3, is connected with the 4th variable resistor R4 between in-phase output end and the reverse input end.
Said envelope detected circuit comprises two metal-oxide-semiconductors, and metal-oxide-semiconductor M3 all is connected direct voltage VDD with the drain electrode of metal-oxide-semiconductor M4, and grid connects local oscillation signal Vrf_in+ and Vrf_in-respectively, and source electrode all connects ground connection behind the first constant-current source I_Bias1; The source electrode of two metal-oxide-semiconductors connects behind the RC filter circuit with the in-phase input end of the operational amplifier OP1 of said amplifier module 2 and is connected.
Said bias voltage is controlled 1 module and is comprised the 3rd metal-oxide-semiconductor M3; The drain and gate of said the 3rd metal-oxide-semiconductor M3 connects the second constant-current source I_Bias2; Source ground, grid is connected with the input of the operational amplifier OP1 of said amplifier module 2, is connected with first capacitor C 1 between source electrode and the grid.
Said output module 3 comprises the second metal-oxide-semiconductor M2; The source ground of the second metal-oxide-semiconductor M2; Grid is connected with in-phase output end, the RF input signal Vrf_in of the operational amplifier OP1 of said amplifier module 2; Drain electrode is as the input of PA, between the in-phase output end of the operational amplifier OP1 of the second metal-oxide-semiconductor M2 grid and amplifier module 2, also is connected with a RC filter circuit of being made up of resistance R 5 and capacitor C 2.
(less in the side circuit design under the situation of ignoring the amplifier DC maladjustment in the amplifier closed loop gain; Domain is preferably under the situation; Amplifier output DC maladjustment can be controlled in the 20mV); Under the gain of common mode feedback loop and the sufficiently high situation of bandwidth of amplifier, can get VBias=VCM+R2/R1*VEV_in, wherein VBias is the output voltage of operational amplifier OP1 in-phase output end; VCM is the voltage of bias voltage control module output, and VEV_in is the voltage of envelope detected module output.It is thus clear that bias voltage equals to add that by the bias voltage value that bias current produces envelope signal multiply by a gain.Be far longer than the envelope signal bandwidth as long as guarantee the closed loop gain bandwidth of amplifier, the time-delay that discharge circuit is introduced can be ignored.The gain of regulating the envelope detected link very easily through the ratio that changes R1 and R2 simultaneously compensates the non-linear of PA.This circuit also can take out through the output direct current with single-ended output amplifier and reference voltage is made comparisons, and the biasing of feedback regulation amplifier realizes, but this implementation method needs extra discharge circuit, and circuit is more complicated.
In sum, the adaptive-biased power amplifier of a kind of variable gain based on common-mode feedback that the utility model provides has been realized biasing and the stack of feedforward envelope and the adjusting of envelope signal gain simultaneously through a fully-differential amplifier.The different path delay of having avoided adaptive bias circuit that utilized RC and CR Network Transmission characteristic are to the PA Effect on Performance.Can confirm suitable feedforward gain according to test result in actual the use, obtain the optimal performance of PA.This implementation circuit structure is simple, does not have feedback path, the no stability problem.
More than show and described basic principle, principal character and the advantage of the utility model.The technical staff of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the specification that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection range by appending claims and equivalent circle thereof.
Claims (5)
1. adaptive-biased power amplifier of the variable gain based on common-mode feedback; Comprise the RF input signal; It is characterized in that: also comprise envelope detected module, bias voltage control module, amplifier module and signal output module; The input of said envelope detected module is connected with the RF input signal, and output is connected with the amplifier module; Said bias voltage control module is connected with said amplifier module; The input of said signal output module is connected with the RF input signal with the amplifier module, and output connects the PA input.
2. the adaptive-biased power amplifier of the variable gain based on common-mode feedback according to claim 1; It is characterized in that: said amplifier module comprises operational amplifier OP1; Said envelope detected module is connected with the in-phase input end of operational amplifier OP1 through the first variable resistor R1, is connected with the second adjustable resistance R2 between in-phase input end and the inverse output terminal; DC power supply Vdc is connected with the reverse input end of operational amplifier OP1 through the 3rd variable resistor R3, is connected with the 4th variable resistor R4 between in-phase output end and the reverse input end.
3. the adaptive-biased power amplifier of the variable gain based on common-mode feedback according to claim 1 and 2; It is characterized in that: said envelope detected circuit comprises two metal-oxide-semiconductors; The drain electrode of said two metal-oxide-semiconductors all connects direct voltage VDD; Grid all connects local oscillation signal, and source electrode all connects ground connection behind first constant-current source; The source electrode of two metal-oxide-semiconductors is connected with said amplifier module after connecting the RC filter circuit.
4. the adaptive-biased power amplifier of the variable gain based on common-mode feedback according to claim 3; It is characterized in that: said bias voltage control module comprises the 3rd metal-oxide-semiconductor; The drain and gate of said the 3rd metal-oxide-semiconductor connects second constant-current source; Source ground, grid is connected with said amplifier module, is connected with first capacitor C 1 between source electrode and the grid.
5. the adaptive-biased power amplifier of the variable gain based on common-mode feedback according to claim 4; It is characterized in that: said output module comprises second metal-oxide-semiconductor; The grid of said second metal-oxide-semiconductor connects the output of RF input signal and amplifier module; Source ground, drain electrode connects the PA input.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205487171U CN202374224U (en) | 2011-12-26 | 2011-12-26 | Variable gain self-adaption bias power amplifier based on common-mode feedback |
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| CN2011205487171U CN202374224U (en) | 2011-12-26 | 2011-12-26 | Variable gain self-adaption bias power amplifier based on common-mode feedback |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570999A (en) * | 2011-12-26 | 2012-07-11 | 苏州云芯微电子科技有限公司 | Variable gain self-adaptive bias power amplifier based on common-mode feedback |
| CN104065267A (en) * | 2013-03-22 | 2014-09-24 | 富士通株式会社 | Power supply device and semiconductor integrated circuit device |
| WO2015149521A1 (en) * | 2014-04-03 | 2015-10-08 | 深圳市中兴微电子技术有限公司 | Current sampling circuit and method |
-
2011
- 2011-12-26 CN CN2011205487171U patent/CN202374224U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570999A (en) * | 2011-12-26 | 2012-07-11 | 苏州云芯微电子科技有限公司 | Variable gain self-adaptive bias power amplifier based on common-mode feedback |
| CN104065267A (en) * | 2013-03-22 | 2014-09-24 | 富士通株式会社 | Power supply device and semiconductor integrated circuit device |
| CN104065267B (en) * | 2013-03-22 | 2017-08-29 | 富士通株式会社 | Supply unit and conductor integrated circuit device |
| WO2015149521A1 (en) * | 2014-04-03 | 2015-10-08 | 深圳市中兴微电子技术有限公司 | Current sampling circuit and method |
| CN104977450A (en) * | 2014-04-03 | 2015-10-14 | 深圳市中兴微电子技术有限公司 | Current sampling circuit and method |
| US9766274B2 (en) | 2014-04-03 | 2017-09-19 | Sanechips Technology Co., Ltd. | Current sampling circuit and method |
| CN104977450B (en) * | 2014-04-03 | 2019-04-30 | 深圳市中兴微电子技术有限公司 | A kind of current sampling circuit and method |
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Granted publication date: 20120808 |