Common-mode level reset circuit for differential signals

A common-mode level and reset circuit technology, applied in differential amplifiers, electrical components, electronic switches, etc., can solve the problems of inability to flexibly adjust the common-mode bias voltage, and the driving ability cannot meet the needs of the lower level, so as to achieve good voltage Following characteristics, high differential linearity, and the effect of increasing the common mode level VT

Active Publication Date: 2014-06-25
无锡三聚阳光知识产权服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of common-mode transfer circuits, and the level transfer can be realized through diodes or MOS devices connected in the form of diodes combined with resistors, but

Method used

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  • Common-mode level reset circuit for differential signals
  • Common-mode level reset circuit for differential signals
  • Common-mode level reset circuit for differential signals

Examples

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[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0028] refer to figure 1 As shown, a common mode level reset circuit for differential signals includes a source follower circuit 1 , a voltage-current conversion circuit 2 , a current output circuit 3 and a common mode reset circuit 4 connected in sequence.

[0029] refer to figure 2 As shown, the source follower circuit 1 uses a pair of PMOS transistors P1, P2, the gates of P1, P2 are directly connected to the input signal, the drains are connected to ground, and the sources are connected to the power supply through resistors R1, R2 respectively. The source follower circuit 1 must have good voltage follower characteristics in the implementation process, so the source follower device PMOS must be of sufficient size, and its equivalent transconductance value must be much larger than the reciprocal of its source load resistance, ...

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Abstract

The invention discloses a common-mode level reset circuit for differential signals. The common-mode level reset circuit comprises a source follow circuit, a voltage-current conversion circuit, a current output circuit and a common-mode reset circuit, wherein the source follow circuit, the voltage-current conversion circuit, the current output circuit and the common-mode reset circuit are sequentially connected. The common-mode level reset circuit can achieve level resetting of output common-mode points, meet the requirement of the next stage input common-mode points, and maintain high differential linearity. The source follow device circuit of a PMOS tube enables the VTH of the input common-mode points to be increased, and the input common-mode points are connected with an NMOS of a following form to form the voltage-current conversion circuit, the input voltage linearity is converted into the current signals, the current signals are transmitted to the current output circuit through image currents, the common-mode level of the current output circuit is reset through the common-mode reset circuit, and finally the common-mode level of the output level VOUT and the VREF are identical. The common-mode level reset circuit achieves resetting of the differential signal common-mode level, maintains the differential linearity of the signals to the maximum degree, and is suitable for the differential signals with the medium amplitude.

Description

technical field [0001] The invention relates to a common-mode level reset circuit for differential signals, and is especially aimed at the level conversion between module circuits in integrated circuits. Background technique [0002] Integrated circuits have developed rapidly in recent years, and the process and integration level have been rapidly improved. The types and quantities of integrated circuits are increasing, and the functions are becoming more and more powerful. Among them, the types and functions of analog circuits are always on the rise. Differential signals are commonly used in small signal processing and transmission modes in analog integrated circuits, and their anti-interference properties can be used to effectively reduce interference. [0003] In integrated circuits, differential MOS pair tubes are a common way to process differential signals. When NMOS and PMOS are used as differential pair tubes, the optimal common-mode voltage may be different. In addi...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03K17/22
Inventor 杜占坤杜大勇
Owner 无锡三聚阳光知识产权服务有限公司
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