A linear transconductance conversion circuit system

Abstract

The invention discloses a linear trans-conductance converting circuit system. The linear trans-conductance converting circuit system comprises a linear trans-conductance converting circuit, wherein the linear trans-conductance converting circuit comprises a voltage input end and a circuit output end; the linear trans-conductance converting circuit is used for converting the input voltage linearity into the output current. In the system disclosed by the embodiment of the invention, the voltage signal is respectively input into a source electrode of the N-field effect tube and the grid electrode of the P-field effect tube, and the same setting is performed on the trans-conductance parameters of the N-field effect tube and the P-field effect tube, the difference of the threshold value voltages of the N-field effect tube and the P-field effect tube is utilized so as to subtract the currents on the N-field effect tube and the P-field effect tube, wherein the obtained output current and the input voltage are in linear relation. The existing system adopts the CMOS process, but the voltage and the current of the field effect tube are in a square relation in the CMOS process, so that the CMOS process can be directly used for the linear trans-conductance; the method used by the invention well solves this problem.

Description

technical field [0001] The invention relates to the technical field of chip transconductance conversion circuits, in particular to a linear transconductance 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 core circuit of VGA is the current square circuit. The output current of this circuit has a square relationship with the input current, but the input and output in VGA are voltage signals, so it is necessary to linearly convert the input voltage signal into a current signal, and then send it to Into the current square circuit, and finally the output current signal is linearly converted into a voltage signal. Contents of the invention [0003] The object of the present invention is to overcome the deficiencies in the prior art. The present invention provides a linear tra...

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Problems solved by technology

[0003] The object of the present invention is to overcome the deficiencies in the prior art. The present invention provides a linear transconductance conversion circuit system, which adopts a CMOS process, and the voltage and current of a field effect transistor in a CMOS process are in a square relationship, so it cannot be directly used For linear transconductance, the method used in the present invention solves this problem well

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