A VHF OTA-C Topology Having Low Phase Error With Gm Tuning

Author

Yadav, Kshitij ; Mandal, Pradip

Author_Institution

Electron. & Electr. Commun. Eng. Dept., Indian Inst. of Technol., Kharagpur

Volume

4

fYear

2006

fDate

25-28 June 2006

Firstpage

2327

Lastpage

2331

Abstract

In sub-micron process, while speed of device is suitable for VHF applications, phase variation at unity gain frequency of OTA-C cell with frequency tuning is high. This is mainly because of high value of channel length modulation parameter of the devices. A technique which makes the phase response robust to frequency tuning is proposed here. Based on this technique a VHF CMOS OTA-C cell is designed in a 0.18 mum CMOS process. The phase error of the cell is within 0.3deg, over a range of unity-gain frequency from 300 MHz to 1.2 GHz. The small phase error over a wide range of frequency implies the use of just one Q-tuning loop for all the integrators having unity-gain frequency within this range. Also this makes this circuit suitable for application in programmable transfer function filters

Keywords

CMOS integrated circuits; Q-factor; VHF filters; circuit tuning; operational amplifiers; programmable filters; transfer functions; 0.18 micron; 0.18 mum CMOS process; 300 MHz to 1.2 GHz; G_m tuning; OTA-C cell; Q-tuning loop; VHF application; channel length modulation parameter; frequency tuning; integrators; operational transconductance amplifier; phase error; phase response; programmable transfer function filters; submicron process; CMOS process; CMOS technology; Circuit topology; Filters; Frequency; Q factor; Robustness; Tail; Transconductance; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems Proceedings, 2006 International Conference on

Conference_Location

Guilin

Print_ISBN

0-7803-9584-0

Electronic_ISBN

0-7803-9585-9

Type

conf

DOI

10.1109/ICCCAS.2006.285143

Filename

4064390