Title :
A pseudo-differential OTA with linearity improving by HD3 feedforward
Author :
Chien, Chao-Liang ; Hung, Chung-Chih ; Chen, Chia-Wei
Author_Institution :
Dept. of Electr. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
This paper presents a fully balanced structure of a CMOS operational transconductance amplifier (OTA) with high linearity for frequency up to 50MHz. The proposed circuit is based on a conventional pseudo-differential structure with a third-order harmonic distortion (HD3) feedforward technique to cancel out the output 3rd harmonic component. The OTA was fabricated in the TSMC CMOS 0.18 ¿m technology. The measurement results show the HD3 of -62dB with 0.4-Vpp 50 MHz input signal and the power consumption of 0.47 mW at a 1.2-V voltage supply.
Keywords :
CMOS analogue integrated circuits; VHF amplifiers; differential amplifiers; feedforward amplifiers; harmonic distortion; operational amplifiers; radiofrequency integrated circuits; CMOS operational transconductance amplifier; HD3 feedforward; TSMC CMOS technology; frequency 50 MHz; linearity; output 3rd harmonic component; power 0.47 mW; pseudodifferential OTA; size 0.18 mum; third-order harmonic distortion feedforward technique; voltage 1.2 V; CMOS technology; Circuits; Distortion measurement; Energy consumption; Frequency; Harmonic distortion; Linearity; Operational amplifiers; Power measurement; Transconductance;
Conference_Titel :
Solid-State Circuits Conference, 2009. A-SSCC 2009. IEEE Asian
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-4433-5
Electronic_ISBN :
978-1-4244-4434-2
DOI :
10.1109/ASSCC.2009.5357222
