Title :
An image-rejection down-converter for low-IF receivers
Author :
Fang, Sher Jiun ; Bellaouar, Abdellatif ; Lee, See Taur ; Allstot, David J.
Author_Institution :
Dept. of Electr. Eng., Univ. of Washington, Seattle, WA
Abstract :
Implemented in 4.1 mm2 in 130-nm CMOS, a dual-conversion image-rejection down-converter applied to the wireless code-division multiple-access (WCDMA) standard draws 13 mA from a single 1.8-V power supply. Using an IF of 2.5 MHz, the WCDMA image-rejection band is widened from 0.58-4.42 MHz to 0.48-5.2 MHz-a bandwidth ratio of 10.8-to accommodate process, voltage, and temperature variations in high-volume production. Ten samples are measured and fully characterized: average image-rejection ratio (IRR) is 46.6 dBc, gain is 12 dB, and noise figure is 10.8 dB. Typical IRR is 44.8, 46.5, and 47.5 dBc at -20degC, 25degC, and 80degC, respectively
Keywords :
CMOS integrated circuits; code division multiple access; frequency convertors; radio receivers; -20 degC; 0.48 to 5.2 MHz; 1.8 V; 10.8 dB; 12 dB; 13 mA; 130 nm; 25 degC; 80 degC; CDMA; CMOS; IF receivers; bandwidth ratio; dual conversion image rejection down converter; image rejection band; image rejection ratio; intermediate frequency receivers; wireless code division multiple access; Bandwidth; Code standards; Gain measurement; Multiaccess communication; Noise figure; Noise measurement; Power supplies; Production; Temperature; Voltage; Image-rejection down-converter; low-IF receiver; mixer; polyphase filter; quadrature local-oscillator (LO) generator; quadrature mixer; wireless code-division multiple-access (WCDMA);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2004.840759
