Title :
A CMOS channel-select filter for a direct-conversion wireless receiver
Author :
Chang, Paul J. ; Rofougaran, Ahmadreza ; Abidi, Asad A.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
fDate :
5/1/1997 12:00:00 AM
Abstract :
A highly selective and linear switched-capacitor channel-select filter is fabricated in 1-μm CMOS for a direct-conversion wireless receiver operating in the 902-928 MHz ISM band. The filter selects a 230-kHz wide channel and attenuates by at least 50 dB from 320 kHz to 57 MHz. The input IP3 is +30 dBm, the input-referred noise in the passband is 70 nV/√Hz, and the circuit takes 4.6 mA from a 3.3 V supply. Direct subsampling of the 915 MHz RF input signal by the filter front-end is also demonstrated with only a small degradation in linearity. The input noise voltage is halved in a redesign while keeping the current drain unchanged
Keywords :
CMOS analogue integrated circuits; VHF filters; biquadratic filters; elliptic filters; frequency response; frequency shift keying; integrated circuit noise; low-pass filters; radio receivers; switched capacitor filters; 1 micron; 3.3 V; 320 kHz to 57 MHz; 4.6 mA; 902 to 928 MHz; 915 MHz; CMOS channel-select filter; ISM band; direct-conversion wireless receiver; input noise voltage; linear SC filter; Active filters; Band pass filters; Degradation; Frequency shift keying; Low pass filters; Passband; Radio frequency; Receivers; Semiconductor device noise; Surface acoustic waves;
Journal_Title :
Solid-State Circuits, IEEE Journal of
