Title :
A CMOS channel-select tunable filter for 3G wireless receivers
Author :
Alzaher, Hussain ; Tasadduq, Nomuan ; Ismail, Mohammed
Author_Institution :
Dept. of Electr. Eng., King Fahd Univ. of Pet. & Miner., Dhahran, Saudi Arabia
Abstract :
A new approach for designing digitally programmable CMOS integrated baseband filters is presented. It utilizes digitally controlled current followers and R-2R ladders to provide precise frequency characteristics that can be tuned over a wide range without components spreading. A 6-order Butterworth lowpass filter is designed for implementing the baseband channel select filter in an integrated multi-standard CMOS wireless receiver. Experimental results obtained from a 0.6μm chip show a programmable frequency response accommodating PDC, IS-54, GSM, IS-95 and WCDMA wireless standards. The proposed filter design achieves dynamic ranges of 90dB for PDC (IS-54), 89dB for GSM, 84dB for IS-95 and 80dB for WCDMA.
Keywords :
3G mobile communication; Butterworth filters; CMOS digital integrated circuits; biquadratic filters; cellular radio; circuit tuning; code division multiple access; continuous time filters; digital filters; frequency response; low-pass filters; programmable filters; radio receivers; 3G wireless receivers; Butterworth lowpass filter; CMOS channel-select tunable filter; CMOS integrated baseband filters; GSM; IS-54; IS-95; PDC; R-2R ladders; WCDMA; biquad filter; buffer circuits; continuous time filtering; digitally controlled current followers; digitally programmable filters; precise frequency characteristics; programmable frequency response; transfer current characteristic; Baseband; Capacitors; Communication standards; Digital filters; Dynamic range; Filtering; Frequency response; GSM; Multiaccess communication; Wireless communication;
Conference_Titel :
Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003 10th IEEE International Conference on
Print_ISBN :
0-7803-8163-7
DOI :
10.1109/ICECS.2003.1301939
