CN203406848U - Source electrode following circuit with high speed and high precision - Google Patents
Source electrode following circuit with high speed and high precision Download PDFInfo
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- CN203406848U CN203406848U CN201320529298.6U CN201320529298U CN203406848U CN 203406848 U CN203406848 U CN 203406848U CN 201320529298 U CN201320529298 U CN 201320529298U CN 203406848 U CN203406848 U CN 203406848U
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- pmos tube
- source electrode
- source
- high precision
- pmos pipe
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Abstract
The utility model relates to a source electrode following circuit with high speed and high precision. The circuit comprises a first PMOS tube and a second PMOS tube. The source electrode of the first PMOS tube is connected with a DC source VAA, the grid electrode of the first PMOS tube is connected with an input voltage VIN, and the drain electrode of the first PMOS tube is connected with the output terminal. The source electrode of the second PMOS tube 2 is connected with the DC source VAA, the grid electrode of the second PMOS tube is connected with the input voltage VIN, and the drain electrode of the second PMOS tube is connected with the output terminal. The source electrode of the first PMOS tube is in parallel connection with an output voltage VOUT. By employing the source electrode following circuit with high speed and high precision, the influence on the low frequency voltage by the output impedance of the PMOS tubes is reduced, the low frequency voltage gain is increased, and the linearity is good.
Description
Technical field
The utility model relates to a kind of source follower, relates in particular to a kind of high-speed, high precision source follower.
Background technology
When buffer circuit generally refers to the large load of demand motive, often with a buffer circuit, drive.It is upper that this circuit is delivered to output by the waveform of input signal, and export electric capacity and the ohmic load that enough electric currents carry out driver output point.The performance index of weighing buffering mainly contain bandwidth, the linearity, low-frequency voltage gain, and output voltage and input voltage are more approaching better, and expected gain is 1.And source follower is applied in buffering widely.
A source follower as shown in Figure 1, its major defect is, and low-frequency gain is 0.8-0.9 left and right, inapplicable to high-precision buffering, and being input to output has direct current pressure drop, and the linearity is poor, and depends on input voltage and voltage space.
In order to solve the problem of direct current pressure drop, can use two-stage source class follow circuit as shown in accompanying drawing 2 and accompanying drawing 3, but the product of the low-frequency gain that low-frequency gain is in this case two-stage only have 0.7 left and right.
When technique provides the metal-oxide-semiconductor of two kinds of different threshold voltages, can use circuit shown in accompanying drawing 4 to improve gain.M1 is the metal-oxide-semiconductor that threshold voltage is higher, and M2 is the metal-oxide-semiconductor that threshold voltage is lower.The threshold voltage difference of M1 and M2 is the source drain voltage of M1.Due to M1, the threshold voltage difference of M2 is not for substantially changing with input voltage, and the source drain voltage of M1 does not change with input voltage substantially yet, causes the output impedance of M1 pipe to diminish on the impact of low-frequency voltage, and low-frequency voltage gain becomes large.Major defect is that technique needs two kinds of different threshold voltages, and this technique is more expensive.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of and can make low-frequency voltage gain become large high-speed, high precision source follower.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions: a kind of high-speed, high precision source follower, comprise a PMOS pipe and the 2nd PMOS pipe, the source electrode of a described PMOS pipe connects DC power supply VAA, grid connects input voltage VIN, and drain electrode connects output; The source electrode of described the 2nd PMOS pipe 2 is connected with DC power supply VAA, and grid is connected with input voltage VIN, and drain electrode connects output.
Preferably, on described the first pmos source, be parallel with output voltage VO UT.
Compared with prior art, usefulness of the present utility model is: this high-speed, high precision source follower makes the output impedance of PMOS pipe diminish on the impact of low-frequency voltage, and low-frequency voltage gain becomes large, and the linearity is good.
accompanying drawing explanation:
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Fig. 1 is existing source class follow circuit structural representation;
Fig. 2, Fig. 3 are existing two-stage source class follow circuit structural representations;
Fig. 4 is the source class follow circuit structural representation that adopts two kinds of threshold voltages;
Fig. 5 is the utility model high-speed, high precision source follower structural representation.
In figure: 1, a PMOS pipe; 2, the 2nd PMOS pipe.
embodiment:
Below in conjunction with the drawings and the specific embodiments, the utility model is described in detail:
A kind of high-speed, high precision source follower shown in Fig. 5, comprise PMOS pipe the 1 and a 2nd PMOS pipe 2, the source electrode of a described PMOS pipe 1 connects DC power supply VAA, and on source electrode, be also parallel with output voltage VO UT, a described PMOS manages 1 grid and connects input voltage VIN, and drain electrode connects output; The source electrode of described the 2nd PMOS pipe 2 is connected with DC power supply VAA, and grid is connected with input voltage VIN, and drain electrode connects output.
This high-speed, high precision source follower makes the poor threshold voltage that is about a PMOS pipe 1 of the source drain voltage of a PMOS pipe 1 add the threshold voltage of the 2nd PMOS pipe 2, fundamental sum input voltage is irrelevant, output impedance diminishes on the impact of low-frequency voltage, and low-frequency voltage gain becomes large, and the linearity is good.
It is emphasized that: be only preferred embodiment of the present utility model above, not the utility model is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present utility model is done above embodiment, all still belong in the scope of technical solutions of the utility model.
Claims (2)
1. a high-speed, high precision source follower, it is characterized in that: comprise a PMOS pipe (1) and the 2nd PMOS pipe (2), the source electrode of a described PMOS pipe (1) connects DC power supply (VAA), and grid connects input voltage (VIN), and drain electrode connects output; The source electrode of described the 2nd PMOS pipe (2) is connected with DC power supply (VAA), and grid is connected with input voltage (VIN), and drain electrode connects output.
2. high-speed, high precision source follower according to claim 1, is characterized in that: on described PMOS pipe (1) source electrode, be parallel with output voltage (VOUT).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320529298.6U CN203406848U (en) | 2013-08-29 | 2013-08-29 | Source electrode following circuit with high speed and high precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320529298.6U CN203406848U (en) | 2013-08-29 | 2013-08-29 | Source electrode following circuit with high speed and high precision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203406848U true CN203406848U (en) | 2014-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320529298.6U Expired - Fee Related CN203406848U (en) | 2013-08-29 | 2013-08-29 | Source electrode following circuit with high speed and high precision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203406848U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490766A (en) * | 2013-08-29 | 2014-01-01 | 苏州苏尔达信息科技有限公司 | High-speed high-precision source electrode follower circuit |
| TWI644195B (en) * | 2016-08-05 | 2018-12-11 | 聯發科技股份有限公司 | Buffer stage and a control circuit |
-
2013
- 2013-08-29 CN CN201320529298.6U patent/CN203406848U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490766A (en) * | 2013-08-29 | 2014-01-01 | 苏州苏尔达信息科技有限公司 | High-speed high-precision source electrode follower circuit |
| TWI644195B (en) * | 2016-08-05 | 2018-12-11 | 聯發科技股份有限公司 | Buffer stage and a control circuit |
| US10613560B2 (en) | 2016-08-05 | 2020-04-07 | Mediatek Inc. | Buffer stage and control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140122 Termination date: 20140829 |
|
| EXPY | Termination of patent right or utility model |