High linearity optimization method for transconductance amplifier

Abstract

The invention discloses a high linearity optimization method of a transconductance amplifier, which is characterized by providing a transconductance amplifier with double-end input and double-end output, and the two input signals of the transconductance amplifier are Vin+=f(t+) and Vin respectively. ‑=f(t‑), the relationship between the two is: where, f(t+) and f(t‑) are both continuous functions of time. The scheme makes the double-ended input and double-ended output transconductor obtain the minimum linear distortion as a whole, and has good performance on the second-order harmonic and the third-order harmonic.

Description

technical field [0001] The invention relates to the design of the Internet of Things and related fields, and is a linearity optimization method applied to the design of a transconductance amplifier. Background technique [0002] In recent years, with the rapid development of integrated circuit design, transconductance operational amplifier (OTA) technology has been widely used in communication electronic systems such as digital-to-analog converters and filters [1]. A transconductance amplifier is a mixed-mode amplifying circuit whose input signal is voltage and output signal is current. Since there are only voltage-to-current conversion circuits and current transmission circuits inside the transconductance amplifier, there is no Miller compensation capacitance multiplication effect, the signal path is single, and the conversion rate under large signals is also high. At the same time, the circuit structure is simple, and the power supply voltage and power consumption can be ...

AI Technical Summary

Problems solved by technology

[0003] Traditional methods to achieve linear transconductance, such as source-level attenuation methods, use passive resistance or dynamic resistance to improve the linearity of transconductors, and increase the combination of two MOS transistors with different width-to-length ratios of asymmetric source-level coupling pairs. , often at the cost of changing the MOS working state or bias current, power consumption, sacrificing other performance indicators of the circuit and increasing the difficulty of circuit design, which will affect the performance of other units of the system or even the system

The commonality of these methods is based on the optimization and improvement of the specific structure of the circuit. The result of the design is to unilaterally reduce the second-order harmonic distortion or the third-order harmonic distortion. In this way, the minimum distortion of the overall circuit of the transconductance amplifier is not obtained. degree, so far there is no literature report to study the inner connection between the two, so it still has limitations in dealing with the harmonic distortion of the overall transconductor

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