CMOS REALIZATION OF CFOA BASED ON CLASS AB SUBTHRESHOLD CURRENT MIRROR OTA AND APPLICATIONS
Abstract
This paper presents a low-voltage low-power current feedback operational amplifier using bulk driven class AB subthreshold current mirror OTA followed by second generation CCII+ cell having wide input common mode range and an output buffer. The CCII+ cell uses two conventional CMOS inverters connected at the output of the OTA. This OTA circuit permits closely rail-to-rail input common mode range, high output current drive capability with low dual power supply of ± 0.25 V. This CFOA cell produces low input referred noise of 0.8 µV/sqrt Hz, dissipates ultra-low power of 485.3 nW and is suitable of low-frequency applications, such as bio-signal processing. This CFOA cells are utilized to design a SIMO type voltage mode biquadratic filter and current mode instrumentation amplifier to validate its workability. The circuit is simulated using tanner EDA tool in 180 nm n-tub CMOS process technology with low bias current of 20 nA.

Authors
Anil Kumar Gautam, Tripurari Sharan
North Eastern Regional Institute of Science and Technology, India

Keywords
Current Feedback Operational Amplifier (CFOA), Bulk-Driven (BD), Second Generation Current Conveyor (CCII), SIMO Biquadratic Filter, Instrumentation Amplifier (IA)
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Published By :
ICTACT
Published In :
ICTACT Journal on Microelectronics
( Volume: 10 , Issue: 1 , Pages: 1717 - 1726 )
Date of Publication :
April 2024
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30
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