A Square Root Term Transconductance Circuit

Abstract

The invention is applicable to the field of integrated circuits, and provides a precise square root item transconductance circuit. The precise square root item transconductance circuit comprises an input voltage linear current module and a square root calculation current generating module; the input voltage linear current module is used for tracking the size of input voltage and outputting current in proportion to the input voltage; through the technological characteristic that an MOS tube works in a saturation region, the square root calculation current generating module generates output current in radical sign relationship with the input voltage. Besides, since branch circuit current of the circuit and the width-length ratio of the MOS tube can be adjusted, the proportion coefficient of square root calculation can be adjusted according to actual needs. Therefore, the precise square root item transconductance circuit is widely applied to a lot of simulation IC. The precise square root item transconductance circuit can effectively solve the problem that a system is limited by the direct current work point range, through a square root calculation circuit, the direct current work range with wide input is reduced to a narrow work range, direct current bias distortion is effectively avoided, and it is guaranteed that a wide input system can normally run in whole-range input.

Description

technical field [0001] The present invention relates to the field of integrated circuits, more specifically, to an accurate square root term transconductance circuit, which can be applied to SOC systems, audio and video analog signal processing modules, etc., and more particularly to non-linear processing in analog signal modulation module. Background technique [0002] Integrated circuit operational amplifier is the most widely used device in integrated circuits. It is not only used in signal calculation, processing, conversion, measurement and signal generation circuits, but also widely used in switching circuits, radio frequency, resonance and other circuits. The most basic operational amplifier circuit can form a simple application circuit with components such as resistors and capacitors, including non-inverting amplifiers, inverting amplifiers, and common difference, summation, integral, differential, and instrumentation amplifiers, etc., in various IC systems Has been...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems existing in the above-mentioned existing related circuits, the present invention proposes an accurate square root term transconductance circuit, which can effectively solve the problem of reducing the large span of the input area when the input voltage range is wide, and can reduce the input voltage without changing the input voltage. On the basis of the changing trend, the area span is reduced through the nonlinear expression, so as to better avoid the DC bias distortion of the circuit and make the circuit work within a reasonable DC operating point range

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