CN208723862U - A kind of common source and common grid amplifier system of gain suppression - Google Patents
A kind of common source and common grid amplifier system of gain suppression Download PDFInfo
- Publication number
- CN208723862U CN208723862U CN201821467635.2U CN201821467635U CN208723862U CN 208723862 U CN208723862 U CN 208723862U CN 201821467635 U CN201821467635 U CN 201821467635U CN 208723862 U CN208723862 U CN 208723862U
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- China
- Prior art keywords
- common
- amplifier
- source
- gain
- circuit
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Abstract
The utility model relates to a kind of common source and common grid amplifier systems of gain suppression, amplifier system is used for analog-digital converter, the system improves amplifier as gain using multiple one-terminal current mirror common source and common grid amplifiers, is divided into two groups and is respectively used to improve the equivalent resistance from equivalent resistance and common-source common-gate current mirror from total bank tube；Common source and common grid amplifier system is made of main operational amplifier circuit, switching capacity Commom-mode feedback circuit, the auxiliary amplifier circuit for gain raising and biasing circuit；Amplifier includes that Differential Input loads pipe, differential pair tube constant-current source, total bank tube, cascode current source, and Differential Input is NMOS tube to pipe.
Description
Technical field
The utility model relates to power amplifier field, the common source and common grid amplifier system of especially a kind of gain suppression.
Background technique
With the continuous development of integrated circuit technique, high performance operational amplifier is widely used in various circuit systems
In, it becomes the kernel cell circuit of simulation and composite signal integrated circuits design, and performance directly affects the whole of circuit system
Body performance.A/D converter is a pith of Modem simulation integrated circuit, with the proposition of digital radio scheduling theory,
It is higher and higher to the accuracy and speed requirement of analog-digital converter, thus the requirement to operational amplifier also increases accordingly.Conventional junction
The amplifier of structure is unable to satisfy the demand of A/D converter with high speed and high precision.
Utility model content
The utility model provides a kind of gain suppression cascade amplification to overcome the deficiencies in the prior art
Device system.To solve above-mentioned technical problem the utility model proposes technical solution are as follows:
A kind of gain suppression common source and common grid amplifier system, the amplifier system are used for analog-digital converter, the system
Amplifier is improved as gain using multiple one-terminal current mirror common source and common grid amplifiers, is divided into two groups and is respectively used to improve from total grid
The equivalent resistance of equivalent resistance and common-source common-gate current mirror at pipe；The common source and common grid amplifier system by main operational amplifier circuit,
Switching capacity Commom-mode feedback circuit, the auxiliary amplifier circuit and biasing circuit composition improved for gain；The amplifier
Pipe, differential pair tube constant-current source, total bank tube, cascode current source are loaded including Differential Input, the Differential Input is to pipe
NMOS pipe.
Detailed description of the invention
Fig. 1 Fig. 1 is the main circuit schematic diagram of the common source and common grid amplifier of gain suppression.
Specific embodiment
As shown in Figure 1, M0, M1 are Differential Input to pipe；M2 is differential pair tube constant-current source；M4, M5 are current source；M6, M7
For total bank tube；M8, M10, M58, M59 are the load of cascode current source.Since the carrier mobility of NMOS tube is higher, use
Amplifier gain and bandwidth can be improved as differential input stage in NMOS pipe.
Since extremely accurately bias voltage can just be such that circuit output common mode stablizes at one to common source and common grid amplifier needs
Fixed value, insertion switch capacitor Commom-mode feedback circuit, stablize the output common mode of entire circuit in desired output voltage
In common mode.
Using gain suppression technology, the DC current gain of operational amplifier can be effectively improved, and does not influence its speed.It adopts
It uses 4 one-terminal current mirror common source and common grid amplifiers to improve amplifier as gain, is divided into two groups and is respectively used to improve from total bank tube
The equivalent resistance at place and the equivalent resistance of common-source common-gate current mirror, to greatly improve DC current gain.Booster amplifier is adopted
It is inputted with electric current, determines booster amplifier from main discharge road by the ratio of input pipe size and corresponding gate device size altogether
The electric current of input.
Since many of entire circuit cascade pipe needs to provide bias, the wide amplitude of oscillation electricity of cascade is used
Stream mirror to provide biasing to these pipes, and wide swing amplitude cascode current mirror improves pendulum while guaranteeing current copy precision
Width, so that circuit keeps working normally while guaranteeing output voltage swing.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (1)
1. a kind of common source and common grid amplifier system of gain suppression, the amplifier system is used for analog-digital converter, and feature exists
In the system improves amplifier as gain using multiple one-terminal current mirror common source and common grid amplifiers, is divided into two groups and uses respectively
In the equivalent resistance for improving equivalent resistance and common-source common-gate current mirror from total bank tube；The common source and common grid amplifier system by
Main operational amplifier circuit, switching capacity Commom-mode feedback circuit, the auxiliary amplifier circuit and biasing circuit composition improved for gain；
The amplifier includes Differential Input to pipe, differential pair tube constant-current source, altogether bank tube, the load of cascode current source, the difference
Input is NMOS pipe to pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821467635.2U CN208723862U (en) | 2018-09-09 | 2018-09-09 | A kind of common source and common grid amplifier system of gain suppression |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821467635.2U CN208723862U (en) | 2018-09-09 | 2018-09-09 | A kind of common source and common grid amplifier system of gain suppression |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208723862U true CN208723862U (en) | 2019-04-09 |
Family
ID=65981573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821467635.2U Expired - Fee Related CN208723862U (en) | 2018-09-09 | 2018-09-09 | A kind of common source and common grid amplifier system of gain suppression |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208723862U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112825476A (en) * | 2019-11-20 | 2021-05-21 | 圣邦微电子（北京）股份有限公司 | Operational amplifier |
-
2018
- 2018-09-09 CN CN201821467635.2U patent/CN208723862U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112825476A (en) * | 2019-11-20 | 2021-05-21 | 圣邦微电子（北京）股份有限公司 | Operational amplifier |
| CN112825476B (en) * | 2019-11-20 | 2022-10-14 | 圣邦微电子（北京）股份有限公司 | Operational amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190409 Termination date: 20210909 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |