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

fYear

2009

fDate

16-18 Nov. 2009

Firstpage

237

Lastpage

240

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 Â¿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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ASSCC.2009.5357222

Filename

5357222