CN104639076A - Lower-power-consumption broadband fully differential operational amplifier - Google Patents
Lower-power-consumption broadband fully differential operational amplifier Download PDFInfo
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- CN104639076A CN104639076A CN201410427716.XA CN201410427716A CN104639076A CN 104639076 A CN104639076 A CN 104639076A CN 201410427716 A CN201410427716 A CN 201410427716A CN 104639076 A CN104639076 A CN 104639076A
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- drain electrode
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- resistance
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- Y02B60/50—
Abstract
The invention relates to a lower-power-consumption broadband fully differential operational amplifier, and belongs to the field of analogue integrated circuits. An operational amplifier circuit is of a feed-forward zero compensation circuit structure. On the basis of an amplifier of a two-stage structure, a feed-forward path from input to output is additionally introduced, and in this way, a left half-plane zero point is formed on the basis of two poles and performs compensation on the phase to achieve stable operational amplification. Because miller compensation is not adopted for the structure, compared with the miller compensation structure, the position of the main pole is higher, and the lower-power-consumption broadband fully differential operational amplifier is more suitable for lower-power-consumption high bandwidth circuit design. The lower-power-consumption broadband fully differential operational amplifier is simple in structure, needs lower power consumption under the condition of meeting the requirement of achieving broadband application, and can meet the requirements of a wireless broadband communication system well.
Description
Technical field
The present invention relates to a kind of broadband Full differential operational amplifier of low-power consumption, be especially applied in the intermediate-frequency circuit of broadband wireless communications transceiver, belong to analogue layout field.
Background technology
Due to developing rapidly of broadband wireless communications, the intermediate-frequency circuit of present transceiver all can at more than 10MHz as the bandwidth frequency in filter and adc circuit, the magnitude of 100MHz even can be reached in some high-speed radiocommunication agreements, require higher, therefore just require that the bandwidth of the operational amplifier be applied in these circuit is larger.And adopt traditional miller compensation that output limit is moved to the direction leaving initial point, the limit of two inter-stages is moved to initial point.If just need to consume very large power consumption if its three dB bandwidth of two stage amplifer structure adopting this medium frequency to compensate will reach more than 10MHz, the electric current that a general operational amplifier consumes can at about 15mA.This, for the circuit of the filter and ADC that can adopt multiple operational amplifier, obviously cannot accept in current drain.In order to meet the requirement of low power dissipation design, the discharge circuit that the present invention proposes have employed a kind of circuit structure of the zero compensation that feedovers.The forward path that one is input to output is introduced by extra in the basis of two-layer configuration amplifier, the basis of two limits is formed the zero point of a Left half-plane, phase place is compensated and realizes the stable of amplifier.Because this structure does not adopt miller compensation, so comparatively miller compensation structure is high in dominant pole position, be more suitable for low-power consumption high bandwidth circuit design.
Summary of the invention
Circuit structure disclosed by the invention mainly realizes the phase compensation of broadband Full differential operational amplifier, the basis meeting amplifier stability realizes the requirement of low-power consumption.
The circuit that the present invention proposes comprises: as the first order main amplifier of input stage, the second level amplifying circuit of first order main amplifier output and the feed-back frequency compensating circuit between first order main amplifier input and second level amplification circuit output end is connected to, to tail current source transistor M by cascade system
1the biasing circuit of bias voltage is provided with second level amplifying circuit.
Wherein first order main amplifier comprises: tail current source transistor M
1drain electrode be connected to input transistors M
2m
3source electrode composition main amplifier importation, transistor M
4drain electrode be connected to transistor M
2drain transistor M
5drain electrode be connected to transistor M
3drain electrode form the loading section of amplifier.Resistance R
1with electric capacity C
1parallel connection and resistance R
2with electric capacity C
2and the transistor M that is united together
4and M
5grid composition common-mode feedback network be used for setting the output common mode voltage of first order amplifier.
Second level amplifier and feedforward compensation circuit comprise: by transistor M
7and M
8grid and drain electrode be connected respectively to the feedforward path that the input of amplifier and output component frequency compensate, and by transistor M
9and M
11drain electrode and source electrode connect together respectively as transistor M
7load; Transistor M
12and M
10drain electrode and source electrode connect together respectively as transistor M
8load, composition second level amplifying circuit, resistance R
3with electric capacity C
3parallel connection and resistance R
4with electric capacity C
4and the transistor M that is united together
6grid and M
6drain electrode be connected to transistor M
7and M
8source electrode composition common-mode feedback network be used for setting the output common mode voltage of second level amplifier.
Biasing circuit comprises: by nmos pass transistor M
13the M be connected with diode
15grid and the current mirror that is connected to form respectively of source electrode, and the PMOS transistor M that diode connects
14drain and gate be connected to transistor M
13drain electrode composition.
Based on the structure that this circuit realizes, its advantage is:
(1) low-power consumption;
(2) amplifier can have very large bandwidth;
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram one of the low-power consumption broadband Full differential operational amplifier embodiment that the present invention proposes.
Fig. 2 is the circuit structure diagram two of the low-power consumption broadband Full differential operational amplifier embodiment that the present invention proposes.
Embodiment
The embodiment of Fig. 1 and 2 graphic extension circuit is as follows: tail current source transistor M
1with input transistors M
2m
3the importation of composition, and the load transistor M of amplifier
4and M
5.Resistance R
1, R
2with electric capacity C
1, C
2form the output common mode voltage that common-mode feedback network is used for setting first order amplifier; By the transistor M of the input and output of connection amplifier
7and M
8the feedforward path of composition, and by transistor M
9, M
10and M
11, M
12the second level amplifying circuit load of composition, resistance R
3, R
4with electric capacity C
3, C
4the common-mode feedback network of composition is used for setting the output common mode voltage of second level amplifier; By nmos pass transistor M
13and M
15the current mirror of composition, and the PMOS transistor M that diode connects
14composition.The difference of Fig. 1 and Fig. 2 is by transistor M
9, M
10and M
11, M
12the second level amplifying circuit connected mode of composition is different, transistor M in Fig. 1
9and M
11drain electrode and source electrode connect together respectively as transistor M
7load; Transistor M
12and M
10drain electrode and source electrode connect together respectively as transistor M
8load.Connected mode in Fig. 2 is then cross coupling structure, and its advantage is that impedance is larger.Concrete connection is as follows: transistor M
9and M
12drain electrode and source electrode connect together respectively as transistor M
7load; Transistor M
11and M
10drain electrode and source electrode connect together respectively as transistor M
8load.
The above optimized circuit of the present invention implements structure, and all equalizations done according to the application's the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (2)
1. a broadband Full differential operational amplifier for low-power consumption, adopts CMOS technology to realize, it is characterized in that comprising first order main amplifier, second level amplifying circuit, the feedforward compensation circuit as input stage; Second level amplifying circuit is connected to first order main amplifier output by cascade system, and feedforward compensation circuit is between first order main amplifier input and second level amplification circuit output end;
First order main amplifier comprises tail current source transistor M
1, transistor M
2, transistor M
3, transistor M
4, transistor M
5, resistance R
1, electric capacity C
1, resistance R
2with electric capacity C
2; Tail current source transistor M
1drain electrode be connected to transistor M
2, M
3the importation of source electrode composition first order main amplifier, transistor M
4drain electrode be connected to transistor M
2drain electrode, transistor M
5drain electrode be connected to transistor M
3drain electrode form the loading section of first order main amplifier; Resistance R
1with electric capacity C
1parallel connection and resistance R
2with electric capacity C
2and the transistor M that is united together
4and M
5grid composition common-mode feedback network be used for setting the output common mode voltage of first order amplifier;
By transistor M
7with transistor M
8grid and drain electrode be connected respectively to the feedforward path of the input of amplifier and output composition feedforward compensation circuit, and by transistor M
9with transistor M
11drain electrode and source electrode connect together respectively as transistor M
7load; Transistor M
12with transistor M
10drain electrode and source electrode connect together respectively as transistor M
8load, composition second level amplifying circuit, resistance R
3with electric capacity C
3parallel connection and resistance R
4with electric capacity C
4and the transistor M that is united together
6grid and M
6drain electrode be connected to transistor M
7with transistor M
8source electrode composition common-mode feedback network be used for setting the output common mode voltage of second level amplifier;
Feedforward compensation circuit is to tail current source transistor M
1the biasing circuit of bias voltage is provided with second level amplifying circuit.
2. circuit as claimed in claim 1, is characterized in that resistance R
1, R
2with electric capacity C
1, C
2form the output common mode voltage that common-mode feedback network is used for setting first order main amplifier, resistance R
3, R
4with electric capacity C
3, C
4the common-mode feedback network of composition is used for setting the output common mode voltage of second level amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410427716.XA CN104639076B (en) | 2014-08-27 | 2014-08-27 | A kind of broadband Full differential operational amplifier of low-power consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410427716.XA CN104639076B (en) | 2014-08-27 | 2014-08-27 | A kind of broadband Full differential operational amplifier of low-power consumption |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104639076A true CN104639076A (en) | 2015-05-20 |
| CN104639076B CN104639076B (en) | 2018-12-11 |
Family
ID=53217474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410427716.XA Active CN104639076B (en) | 2014-08-27 | 2014-08-27 | A kind of broadband Full differential operational amplifier of low-power consumption |
Country Status (1)
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| CN (1) | CN104639076B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733378A (en) * | 2017-11-07 | 2018-02-23 | 杭州城芯科技有限公司 | A kind of current multiplexing low-power consumption feed forward operation amplifier circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2645565A1 (en) * | 2012-03-27 | 2013-10-02 | Dialog Semiconductor GmbH | A fully differential amplifier topology to drive dynamic speakers in class AB mode |
-
2014
- 2014-08-27 CN CN201410427716.XA patent/CN104639076B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2645565A1 (en) * | 2012-03-27 | 2013-10-02 | Dialog Semiconductor GmbH | A fully differential amplifier topology to drive dynamic speakers in class AB mode |
Non-Patent Citations (1)
| Title |
|---|
| 孙振亚 等: "一种12位100MSPS采样保持电路的设计", 《微电子学与计算机》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733378A (en) * | 2017-11-07 | 2018-02-23 | 杭州城芯科技有限公司 | A kind of current multiplexing low-power consumption feed forward operation amplifier circuit |
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| Publication number | Publication date |
|---|---|
| CN104639076B (en) | 2018-12-11 |
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Address after: 102209 Beijing, Beiqijia, the future of science and technology in the south area of China electronic network security and information technology industry base C building, Applicant after: Beijing CEC Huada Electronic Design Co., Ltd. Address before: 100102 Beijing City, Chaoyang District Lize two Road No. 2, Wangjing science and Technology Park A block five layer Applicant before: Beijing CEC Huada Electronic Design Co., Ltd. |
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