CN100542019C - The output-stage circuit of operational amplifier - Google Patents
The output-stage circuit of operational amplifier Download PDFInfo
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- CN100542019C CN100542019C CNB200610031093XA CN200610031093A CN100542019C CN 100542019 C CN100542019 C CN 100542019C CN B200610031093X A CNB200610031093X A CN B200610031093XA CN 200610031093 A CN200610031093 A CN 200610031093A CN 100542019 C CN100542019 C CN 100542019C
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Abstract
The invention discloses a kind of output-stage circuit of operational amplifier, comprise triode M1 and M2 that two drain electrodes link together, the drain electrode of described triode M1 and the drain electrode of M2 are as output, the source electrode of described triode M2 connects power end, the source ground of described triode M1, the grid of described triode M1 is as input, the grid of described triode M2 is connected with resistance R 1, an end that does not connect described triode M2 of described resistance R 1 is connected with capacitor C 1 as the voltage bias input between the grid of described triode M1 and the grid of M2.The present invention has omitted the constant voltage power supply circuit part by increase the mode of electric capacity between the grid of two triodes, has simplified circuit greatly, and has improved the mutual conductance of circuit, has increased maximum output current, has improved the delivery efficiency of output stage.
Description
Technical field
The present invention relates to a kind of analog circuit, especially a kind of output-stage circuit of operational amplifier.
Background technology
Operational amplifier is the critical component of Analog Circuit Design, and it applies to filter in a large number, and digital analog converter is in the analog-digital converter design.
Operational amplifier is made up of internal gain level and output stage, and wherein output stage mainly designs in order to drive load.In order on little load resistance, to obtain bigger output voltage swing, just require output stage can export very big electric current.And a heavy load electric capacity also requires very big output current that needed charging and discharging currents is provided, and could satisfy the requirement of transient response.
Usually realize the method for operational amplifier output stage now, comprise class-a amplifier, AB class push-pull amplifier.
The structure of described category-A amplification output stage includes the voltage input end vin of output stage as shown in Figure 1, and input vin is connected to the grid of triode M1, and voltage bias end vbias is connected to triode M2 grid, has constituted a bias current sources.The mutual conductance of class-a amplifier is the mutual conductance g of M1
M1, the current source of output stage has limited the maximum current that circuit can be exported.
The structure that the AB class is recommended amplifier output stage as shown in Figure 2, the voltage input end vin that comprises output stage, input vin is connected to the grid of M1, a constant voltage power supply circuit is connected between the grid of two triode M1 and M2, the positive pole of constant pressure source is connected with the grid of triode M2, the negative pole of constant pressure source is connected with the grid of triode M1, the constant voltage source circuit makes its both end voltage difference keep constant, the voltage follow negative pole end change in voltage of the positive terminal of constant pressure source output also just makes the voltage of triode M2 grid change with the variation of triode M1 grid voltage.The mutual conductance of class ab ammplifier is g
M1+ g
M2(the mutual conductance sum of the mutual conductance of M1 and M2) can not limit the current source of exporting maximum current in this circuit.
AB class output stage needs a constant voltage source circuit, and for fear of the gain that influences previous stage, its input impedance is than higher, implement more complicated, after having increased the constant voltage source circuit, the delivery efficiency of whole output stage also reduces greatly, and also more complicated of circuit structure.
Summary of the invention
Technical problem to be solved by this invention provides a kind of output-stage circuit of operational amplifier, can improve mutual conductance, when increasing maximum output current, simplifies circuit structure, improves the delivery efficiency of output stage.
For solving the problems of the technologies described above, the technical scheme of the output-stage circuit of operational amplifier of the present invention is, comprise triode M1 and M2 that two drain electrodes link together, the drain electrode of described triode M1 and the drain electrode of M2 are as output, the source electrode of described triode M2 connects power end, the source ground of described triode M1, the grid of described triode M1 is as input, the grid of described triode M2 is connected with resistance R 1, an end that does not connect described triode M2 of described resistance R 1 is connected with capacitor C 1 as the voltage bias input between the grid of described triode M1 and the grid of M2.
The present invention has omitted the constant voltage power supply circuit part by increase the mode of electric capacity between the grid of two triodes, has simplified circuit greatly, and has improved the mutual conductance of circuit, has increased maximum output current, has improved the delivery efficiency of output stage.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and Examples:
Fig. 1 is the circuit diagram that existing category-A amplifies output-stage circuit;
Fig. 2 is the circuit diagram that existing AB class is amplified output-stage circuit;
Fig. 3 is the circuit diagram of the output-stage circuit of operational amplifier of the present invention.
Embodiment
The output-stage circuit of operational amplifier of the present invention can be referring to shown in Figure 3, comprise triode M1 and M2 that two drain electrodes link together, the drain electrode of described triode M1 and the drain electrode of M2 are as output, the source electrode of described triode M2 connects power end, the source ground of described triode M1, the grid of described triode M1 is as input, the grid of described triode M2 is connected with resistance R 1, an end that does not connect described triode M2 of described resistance R 1 is connected with capacitor C 1 as the voltage bias input between the grid of described triode M1 and the grid of M2.
Triode M1 is a nmos pass transistor, triode M2 is a PMOS transistor, input vin is connected to the grid of triode M1, the source ground avss of triode M1, drain electrode is connected with M2 in the drain electrode of triode M1, the common output vout that constitutes output stage, the grid of triode M2 is connected with input vin by a capacitor C 1, link biased electrical pressure side vbias by a resistance R 1 simultaneously, biased electrical pressure side vbias provides suitable working point for triode M2, and the source electrode of M2 is connected to power supply avdd.
By selecting suitable R 1 and C1, the grid voltage v1 of M2 can follow the above input voltage of certain frequency and change,
The mutual conductance of whole output stage is
g
M1And g
M2Be respectively the mutual conductance of M1 and the mutual conductance of M2.
The output-stage circuit of operational amplifier provided by the present invention has effectively increased the mutual conductance of output stage, reached the similar characteristic of AB class amplification output-stage circuit, because output stage of the present invention has just increased a resistance and an electric capacity on the category-A basis, do not increase any active device, so delivery efficiency is higher than the AB class formation, structure is also simple a lot.
Claims (1)
1. the output-stage circuit of an operational amplifier, comprise triode M1 and M2 that two drain electrodes link together, the drain electrode of described triode M1 and the drain electrode of M2 are as output, the source electrode of described triode M2 connects power end, the source ground of described triode M1, the grid of described triode M1 is as input, it is characterized in that: the grid of described triode M2 is connected with resistance R 1, an end that does not connect described triode M2 of described resistance R 1 is connected with capacitor C 1 as the voltage bias input between the grid of described triode M1 and the grid of M2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610031093XA CN100542019C (en) | 2006-09-13 | 2006-09-13 | The output-stage circuit of operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610031093XA CN100542019C (en) | 2006-09-13 | 2006-09-13 | The output-stage circuit of operational amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101145764A CN101145764A (en) | 2008-03-19 |
| CN100542019C true CN100542019C (en) | 2009-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200610031093XA Active CN100542019C (en) | 2006-09-13 | 2006-09-13 | The output-stage circuit of operational amplifier |
Country Status (1)
| Country | Link |
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| CN (1) | CN100542019C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244501B (en) * | 2010-05-12 | 2014-06-11 | 四川和芯微电子股份有限公司 | CMFB (common mode feedback) circuit |
| CN102437820B (en) * | 2011-12-21 | 2014-11-26 | 苏州云芯微电子科技有限公司 | Clock amplifier circuit for lowering introduction of phase noise |
| CN109656298B (en) * | 2018-12-28 | 2024-07-05 | 安徽沃巴弗电子科技有限公司 | Push-pull output circuit |
-
2006
- 2006-09-13 CN CNB200610031093XA patent/CN100542019C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101145764A (en) | 2008-03-19 |
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Owner name: RDA TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: RDA MICROELECTRONICS (SHANGHAI) CO., LTD. Effective date: 20100426 |
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Free format text: CORRECT: ADDRESS; FROM: 201203 ROOM 302, BUILDING 2, NO.690, BIBO ROAD, PUDONG NEW DISTRICT, SHANGHAI CITY TO: HOUSE 22, ZHONGYIN BUILDING, MIDDLE 1ST ROAD, HONG KONG GARDEN |
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Effective date of registration: 20100426 Address after: 22 floor, Bank of China Tower, 1 Garden Road, Hongkong Patentee after: RDA Microelectronics Co., Ltd. Address before: 201203, room 2, building 690, No. 302 blue wave road, Shanghai, Pudong New Area Patentee before: RDA Microelectronics (Shanghai) Corp. Ltd. |