Title :
A Highly Linear Operational Transconductance Amplifier (OTA) with High Common Mode Rejection Ratio
Author :
Rezaei, Farzan ; Azhari, Seyed Javad
Author_Institution :
Dept. of Electron., Iran Univ. of Sci. & Technol., Tehran, Iran
Abstract :
This paper presents a highly linear Operational Transconductance Amplifier (OTA) that combines two linearization techniques, one with adaptive biasing of differential pairs and second with using of resistive source degeneration. OTA has ±0.9 v power supply and consumes 456 ¿w. Improvement of adaptive bias circuit has enhanced the CMRR to 135 dB in DC. OTA has been simulated with TSMC 0.18 ¿m technology in Hspice. The simulated third order harmonic distortion (HD3) with applying a 600 mvP-P differential input, remains below -67 dB at 3 MHz frequency.
Keywords :
SPICE; operational amplifiers; CMRR; Hspice; OTA; adaptive bias circuit; differential pairs adaptive biasing; frequency 3 MHz; high common mode rejection ratio; linearization techniques; operational transconductance amplifier; power 456 muW; resistive source degeneration; size 0.18 mum; third order harmonic distortion; voltage 0.9 V; Circuit simulation; Differential amplifiers; Harmonic distortion; Linearity; Linearization techniques; Operational amplifiers; Signal processing; Tail; Transconductance; Transconductors; CMRR; Operational Transconductance Amplifier (OTA); adaptive bias circuit; linearity; source degeneration;
Conference_Titel :
Signal Acquisition and Processing, 2010. ICSAP '10. International Conference on
Conference_Location :
Bangalore
Print_ISBN :
978-1-4244-5724-3
Electronic_ISBN :
978-1-4244-5725-0
DOI :
10.1109/ICSAP.2010.39
