Journal of Guangxi Normal University(Natural Science Edition) ›› 2014, Vol. 32 ›› Issue (4): 6-10.

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Novel High Gain CMOS Operational Transconductance Amplifier

FAN Dong-dong, SONG Shu-xiang, JIANG Pin-qun, CEN Ming-can   

  1. College of Electronic Engineering, Guangxi Normal University, Guilin Guangxi 541004, China
  • Received:2014-09-20 Published:2018-09-26

Abstract: A novel operational transconductance amplifier (OTA) with high and variable gain, by introducing the current multiplication and distribution technology, is proposed to solve the problem of obtaining high and tunable gain operational amplifier in a low voltage and deep sub-micron process. Under the supply voltage of 1.8 V, the OTA is simulated by Spectre in 0.18 μm standard COMS technology. Results show that the OTA gets a DC open loop tunable gain from 61 dB to 91 dB, maximum static power consumption of 434 μW and minimum common mode rejection ratio of 114 dB. Compared with traditional OTA, the proposed OTA has the advantages of high and variable gain, it can be applied to communication, electronic measurement and automatic control systems.

Key words: CMOS, OTA, current processing, high gain

CLC Number: 

  • TN721
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