GaAs HBT high-gain broadband linear transconductance unit circuit

Abstract

The invention discloses a GaAs HBT high-gain broadband linear transconductance unit circuit comprising an input stage subcircuit, a basic transconductance subcircuit, a linear subcircuit, a negative resistance subcircuit and a mirror current source subcircuit, wherein the input stage subcircuit is used for level shift of input differential voltages IN_P and IN_N and conducts shifted signals into the basic transconductance subcircuit; the basic transconductance subcircuit is used for converting the input differential voltage signals into differential current signals; the linear subcircuit is used for improving the linearity of the basic transconductance subcircuit; the negative resistance subcircuit is used for improving the gain of the transconductance circuit; and the mirror current source subcircuit is used for providing bias current for the rest circuits. The circuit is designed and manufactured by a GaAs HBT technology and has wide operation bandwidth; the adopted linear subcircuit can effectively complement the nonlinearity of the circuit and provides excellent linearity; and the negative resistance subcircuit is adopted to effectively solve the conflict between the high-gainrequirement of circuits and transistor saturation and improves high-gain performance.

Description

technical field [0001] The present invention relates to the field of semiconductor device and integrated circuit design, in particular to a high-gain broadband linear transconductance unit designed by adopting gallium arsenide heterojunction bipolar transistor (GaAs HBT) technology to convert input differential voltage into differential output current circuit. Background technique [0002] Because of its excellent high-frequency and breakdown performance, GaAs HBT has become one of the best choices for designing and manufacturing radio frequency circuits and ultra-high-speed digital-analog hybrid circuits. Integrated circuits designed and manufactured using GaAs HBT technology have higher operating frequency and wider bandwidth, and have good device matching performance, and are suitable for large-scale digital-analog hybrid integrated circuits. The transconductance unit circuit is used to convert the input voltage signal into a current signal output, and is usually used in...

AI Technical Summary

Problems solved by technology

In addition, in order to provide high gain, according to the gain calculation formula A V =-g m · R L (where A V is the voltage gain of the transconductance circuit, g m is the transconductance, R L is the load resistance), a large load resistance is required; but a large load resistance will cause a large DC voltage drop across it, causing the transistors in the circuit to saturate and fail to work normally

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