Title :
A 71-MHz CMOS IF-baseband strip for GSM
Author :
Orsatti, Paolo ; Piazza, Francesco ; Huang, Qiuting
Author_Institution :
Integrated Syst. Lab., Swiss Fed. Inst. of Technol., Zurich, Switzerland
Abstract :
An intermediate-frequency (IF) baseband strip for a superheterodyne GSM receiver developed in a 0.25-/spl mu/m CMOS technology is presented. It contains a 71-MHz IF amplifier, programmable between -20 and +60 dB in 2-dB steps; a quadrature demodulator; and two low-pass output filters for channel selection. Measurements show an overall maximum gain of 89 dB and a noise figure of 3.8 dB. Phase and amplitude mismatches of the demodulator are below 10 and 0.1 dB, respectively. The high linearity required by the blocking and intermodulating signals, which are not completely suppressed by the IF filter, has been achieved using 4.7 mA from the 2,5-V power supply.
Keywords :
CMOS analogue integrated circuits; cellular radio; digital radio; intermediate-frequency amplifiers; superheterodyne receivers; 0.25 micron; 2.5 V; 3.8 dB; 4.7 mA; 71 MHz; 89 dB; CMOS IF-baseband strip IC; channel selection; low-pass filter; mobile communication; programmable IF amplifier; quadrature demodulator; superheterodyne GSM receiver; Baseband; CMOS technology; Demodulation; GSM; Gain measurement; Linearity; Low pass filters; Noise figure; Noise measurement; Strips;
Journal_Title :
Solid-State Circuits, IEEE Journal of
