Rail-to-rail level shift circuit with high linearity

Abstract

A rail-to-rail level shift circuit with high linearity belongs to the electronic circuit field. an computing strategy comparator and two-grade digit selectors are employed to generate first A channel control signals A and second A channel control signals -A, or first B channel control signals B and second B channel control signals -B to control input voltage to access an A channel or a B channel, wherein the A channel is formed by allowing input voltage of the level shift circuit to pass through a first-grade digit selector, a voltage reduction unit, the first-grade digit selector, a boosting unit and a second-grade digit selector, and the B channel is formed by allowing the input voltage of the level shift circuit to pass through the first-grade digit selector, the boosting unit, the first-grade digit selector, the voltage reduction unit and the a second-grade digit selector. The complex circuit design and the extra power consumption demand are avoided, and an interface circuit of a common mode level through high linearity regulation of external sampling to an internal operational amplifier.

Description

technical field [0001] The invention belongs to the field of basic electronic circuits, and in particular relates to the design of a rail-to-rail level displacement circuit with high linearity. Background technique [0002] The analog signal collected from the external sampling circuit generally has the characteristics of a wide common-mode range. When the general amplifier processes this analog signal, it cannot be effectively amplified because it exceeds the common-mode input range. The general processing method is to use a rail-to-rail input amplifier structure for signal amplification, that is, to use a combination of NMOS input pair transistors and PMOS input pair transistors, and to select and conduct different pairs of transistors in different common-mode input ranges. Existing typical rail-to-rail input stage circuits such as figure 1 As shown, but the amplification effect of this amplifier will have a large difference when the common-mode input is at the center of ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the operation of analog signals with high linearity requirements in existing rail-to-rail amplifiers, avoid over-complex circuit design and additional power consumption requirements, and realize high linearity adjustment of external sampling to internal The interface circuit of the common mode level of the op amp

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