Title :
CMOS baseband filter for WCDMA integrated wireless receivers
Author :
Alzaher, H. ; Elwan, H. ; Ismail, M.
Author_Institution :
Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA
fDate :
8/31/2000 12:00:00 AM
Abstract :
A new second-order lowpass filter based on a single CMOS fully differential current conveyor is presented. Developed from the Sallen-Key highpass filter, the proposed filter is AC coupled and provides programmable gain. Moreover, the filter exhibits low noise, high linearity and low power, making it suitable for implementing the baseband filter of a WCDMA direct-conversion wireless receiver. A WCDMA filter having a programmable bandwidth around 2.1 MHz, a variable gain range of 50 dB and a DC notch below 2 kHz using passive components below 5 kW for resistors and 20 pF for capacitors is implemented. Experimental and simulation results obtained from fabricated chips are included
Keywords :
CMOS analogue integrated circuits; UHF filters; UHF integrated circuits; cellular radio; code division multiple access; current conveyors; high-pass filters; low-pass filters; 2.1 MHz; AC coupled filter; CMOS baseband filter; DC notch; Sallen-Key highpass filter; WCDMA integrated wireless receivers; direct-conversion wireless receiver; fully differential current conveyor; linearity; passive components; programmable bandwidth; programmable gain; second-order lowpass filter; variable gain range;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20001114
