15MHz wide tuning-range OTA with −69dBHD3 and its application to Gm-C filter

Author

Lin, Jun-Ye ; Chang, Wei-Hsiu ; Hung, Chung-Chih

Author_Institution

Dept. of Electr. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

fYear

2011

fDate

25-28 April 2011

Firstpage

1

Lastpage

4

Abstract

This paper presents a high linearity operational transconductance amplifier (OTA). The OTA circuit combines the techniques of the double differential pairs (DDP) and Source-degenerated current mirrors to achieve high linearity in a large GM tuning range. With the Gm values ranged from 60μS to 130μS, the HD3 of the OTA is below -69dB at 15MHz. The OTA has been applied to a fourth-order linear phase low-pass filter for high speed system. The fourth-order low-pass filter with the cutoff frequency of 15MHz has been implemented. The filter is designed by 0.18-μm CMOS process technology, the HD3 performance is about -53dB, and the group delay variation is below 5% at cutoff frequency.

Keywords

CMOS analogue integrated circuits; low-pass filters; operational amplifiers; CMOS process technology; DDP; Gm-C filter; OTA; double differential pairs; fourth-order low-pass filter; frequency 15 MHz; linear phase low-pass filter; operational transconductance amplifier; size 0.18 micron; source-degenerated current mirror; Cutoff frequency; Linearity; Low pass filters; Maximum likelihood detection; Power harmonic filters; Transconductance; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Design, Automation and Test (VLSI-DAT), 2011 International Symposium on

Conference_Location

Hsinchu

ISSN

Pending

Print_ISBN

978-1-4244-8500-0

Type

conf

DOI

10.1109/VDAT.2011.5783589

Filename

5783589