Title :
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
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;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465707
