Current square switching circuit system

Abstract

The invention discloses a current square switching circuit system. A current square switching circuit comprises a fixed voltage generating circuit and a current square circuit; the fixed voltage generating circuit comprises a fixed voltage output end and a circuit output end, and is used for providing fixed voltage for the current square circuit; the current square circuit is connected with the fixed voltage generating circuit, and a square relationship is formed between an output current and an input circuit of the current square circuit. In the embodiment of the current square switching circuit system, the fixed voltage generating circuit is composed of two P-type field effect transistors and used for providing the fixed voltage for the current square circuit, the current square circuit is composed of three P-type field effect transistors, and finally, the current is output with a set of current mirrors. The current square switching circuit system is simple in circuit structure and small in chip area, and the standard CMOS technology is adopted.

Description

technical field [0001] The invention relates to the technical field of chip current square conversion circuits, in particular to a current square conversion circuit system. Background technique [0002] A variable gain amplifier (variable gain amplifier, VGA) has a wide range of applications in systems that need to process analog signals, such as hearing aids, hard disks, and communications. The triode is used in the traditional VGA design. This is because the voltage and current in the triode have an exponential relationship and can be used to realize the VGA. However, in the advanced CMOS process, the voltage and current have a square relationship, so the use of CMOS transistors cannot realize VGA like a triode, and at the same time, the triode device is no longer provided in the advanced CMOS process, so the original design method is no longer applicable, and it is urgent to use CMOS devices replace. One of the solutions is to use the Taylor series to approximate the ex...

AI Technical Summary

Problems solved by technology

However, in the advanced CMOS process, the voltage and current have a square relationship, so the use of CMOS transistors cannot realize VGA like a triode, and at the same time, the triode device is no longer provided in the advanced CMOS process, so the original design method is no longer applicable, and it is urgent to use CMOS devices replace

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