A source follower circuit

A source-following, circuit technology, applied in the field of source-following circuits, to achieve the effect of simple circuits

Active Publication Date: 2020-02-04
PUYA SEMICON SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since Vth will change with temperature and process angle, VOUT will also change with temperature and process angle, resulting in a large deviation: at different temperatures and process angles, the maximum is about + / -0.15V ~+ / -0.2V deviation

Method used

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Embodiment Construction

[0024] The invention provides a more accurate source follower circuit, the output voltage of which does not vary with changes in temperature and process angle. The present invention is as figure 2 In the source follower circuit shown, M0 and M1 are N-type MOS tubes; M2, M3, and M4 are native MOS tubes, and the threshold voltage is close to 0V; I0, I1, I2, and I3 are bias current sources, corresponding The current value of I 0 , I 1 , I 2 , I 3 ;Resistor R0, the resistance is R 0 .

[0025] The sources of M0 and M1 are connected to the input of I1, and the output of I1 is grounded; the gate of M0 is connected to the reference voltage VREF; the drain of M0 is connected to the source of M2, corresponding to the voltage VD; the gate of M1 and its drain The pole is connected to the gate of M2 and the source of M3, corresponding to the voltage VA; the drain of M2 is connected to the power supply voltage VDD.

[0026] The input terminal of I0 is connected to the power supply ...

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Abstract

The invention relates to a source following circuit. By additionally arranging a cascode mirror image circuit and a common-source circuit, threshold voltage is overlaid on reference voltage, output voltage does not change along with variations of temperature and process corners, and deviation is small. Accordingly, output voltage of a traditional source following circuit is compensated, the problem that the output voltage of the traditional source following circuit can change along with the variations of the temperature and the process corners is solved, and the characteristics of the output voltage are improved. The circuit is simple, and the area overhead can be ignored basically.

Description

technical field [0001] The invention relates to a source follower circuit. Background technique [0002] Traditional CMOS source follower circuits such as figure 1 As shown, it includes an intrinsic MOS transistor M4, its drain is connected to the power supply voltage VDD, its gate is connected to the reference voltage VREF, its source corresponds to the output voltage VOUT, and is connected to the bias current source I3. The output voltage VOUT=VREF-Vth, because the threshold voltage Vth≈0 of the intrinsic MOS transistor, so VOUT≈VREF. However, since Vth will change with temperature and process angle, VOUT will also change with temperature and process angle, resulting in a large deviation: at different temperatures and process angles, the maximum is about + / -0.15V ~+ / -0.2V deviation. Contents of the invention [0003] The purpose of the present invention is to provide a source follower circuit that can generate a more accurate output voltage that does not vary with tem...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor冯国友
OwnerPUYA SEMICON SHANGHAI CO LTD