Active-RC channel selection filter tunable from 6 kHz to 18 MHz for software-defined radio

Author

Hwang, Jin-Hong ; Lee, Mi-Young ; Jeong, Chan-Young ; Yoo, Changsik

Author_Institution

Dept. Electron. & Comput. Eng., Hanyang Univ., Seoul, South Korea

fYear

2005

fDate

23-26 May 2005

Firstpage

4803

Abstract

An active-RC channel selection filter for SDR is described whose cut-off frequency is tunable from 6 kHz to 18 MHz. This frequency tuning range is sufficient to cover from PDC (25 kHz) to IEEE 802.11a (20 MHz), including the effect of process, voltage, temperature variations. For the wide tuning range, a differential R-2R ladder has been developed which gives widely variable resistance with minimum silicon area. Wide bandwidth operational amplifier (op-amp) is designed to dissipate small power by employing a current re-using feedforward frequency compensation scheme.

Keywords

CMOS analogue integrated circuits; RC circuits; active filters; electric resistance; integrated circuit design; ladder filters; operational amplifiers; software radio; wideband amplifiers; 6 kHz to 18 MHz; CMOS technology; IEEE 802.11a; active-RC channel selection filter; current re-using feedforward frequency compensation scheme; cut-off frequency; differential R-2R ladder; filter design; process variations; software-defined radio; temperature variations; voltage variations; wide bandwidth operational amplifier; Bandwidth; Cutoff frequency; Dynamic range; Filters; Operational amplifiers; Radio frequency; Radiofrequency amplifiers; Software radio; Tuning; Voltage; CMOS; Channel selection filter; active-RC; software defined radio;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on

Print_ISBN

0-7803-8834-8

Type

conf

DOI

10.1109/ISCAS.2005.1465707

Filename

1465707