Design of a Gm-C Dynamic Amplifier with High Linearity and High Temperature and Power Supply Voltage Stability

TL;DR

This paper introduces a Gm-C dynamic amplifier that achieves high linearity and stability across temperature and supply voltage variations by employing asymmetric differential pairs and a constant-gm bias circuit.

Contribution

The paper presents a novel Gm-C amplifier design with enhanced linearity and stability under varying temperature and supply conditions, using asymmetric differential pairs and a constant-gm bias circuit.

Findings

Achieves a THD of 70.5 dB.

Maintains nearly constant gain within -40 mV to 40 mV input range.

Gain variation remains within 15.1 to 16.3 across temperature and voltage fluctuations.

Abstract

This paper presents a Gm-C dynamic amplifier with high linearity and high temperature and power supply voltage stability. The main part of the amplifier employs two asymmetric differential pairs to enhance transconductance linearity. The amplifier maintains a nearly constant gain within a differential input range of -40 mV to 40 mV, and achieves a total harmonic distortion (THD) of 70.5 dB. The bias part of the amplifier adopts a constant-gm bias circuit, which improves the temperature and supply voltage stability of the amplifier's transconductance and gain. When the differential input is 1 mV, the power supply voltage fluctuates by $\pm$10%, and the temperature varies between -40$\mathrm{^\circ C}$ and 120$\mathrm{^\circ C}$, the standard deviation of the gain distribution is 262m, and the distribution range is from 15.1 to 16.3.