Journal of Guangxi Normal University(Natural Science Edition) ›› 2018, Vol. 36 ›› Issue (1): 17-24.doi: 10.16088/j.issn.1001-6600.2018.01.003

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A Novel Low-voltage Micro-power Pseudo-differential CMOS OTA

DENG Yabin,JIANG Pinqun*,SONG Shuxiang   

  1. College of Electronic Engineering,Guangxi Normal University,Guilin Guangxi 541004,China
  • Received:2017-07-08 Online:2018-01-20 Published:2018-07-17

Abstract: In this paper,a novel pseudo-differential transconductance amplifier with low-voltage micro-power high-gain high common-mode rejection ratio is designed,aimed at the problems of high power supply voltage,high power consumption in the full-differential transconductance amplifier,as well as small gain and low common mode rejection ratio in the conventional pseudo-differential transconductance amplifier. The proposed transconductance amplifier is composed of two stages. The first stage is a pseudo-differential input structure with inverter and common mode feedforward. The second stage is a self-bias current mirror output structure. The positive body bias technique and the TSMC 40nm CMOS process are adopted. Cadence Specter simulation results show that under the power supply voltage of 0.5 V,the transconductance amplifier open-loop gain is 51.8 dB,the unit gain bandwidth is 18.6 MHz,the phase margin is 70°,the common mode rejection ratio is 135dB, and the power supply rejection ratio is 107 dB,while the power consumption is only 3 μW. This amplifier has good comprehensive performance and can be used for most front-end weak signal amplifiers with higher demanding.

Key words: OTA;pseudo-differential;inverter;common mode feedforward;self-bias current mirror;positive body bias

CLC Number: 

  • TN722
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