Title :
Switched-capacitor bandpass delta-sigma A/D modulation at 10.7 MHz
Author :
Singor, Frank W. ; Snelgrove, Martin W.
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
fDate :
3/1/1995 12:00:00 AM
Abstract :
Two second-order bandpass delta-sigma A/D modulators have been implemented in a 0.8 μ BiCMOS process to demonstrate the feasibility of converting a 10.7 MHz radio IF signal to digital form. The circuits, based on switched-capacitor biquads, demonstrated 57 dB SNR in a 200 kHz bandwidth when clocked at 42.8 MHz, dissipating 60 mW from a 5 V supply. The two modulators use different clocking strategies to allow evaluation of a tradeoff between active and passive sensitivities
Keywords :
BiCMOS integrated circuits; biquadratic filters; mixed analogue-digital integrated circuits; modulators; radiotelephony; sigma-delta modulation; switched capacitor networks; 0.8 micron; 10.7 MHz; 200 kHz; 42.8 MHz; 5 V; 57 dB; 60 mW; BiCMOS process; SC biquads; clocking strategies; delta-sigma A/D modulation; radio IF signal; second-order type; switched-capacitor biquads; Band pass filters; Bandwidth; Base stations; BiCMOS integrated circuits; Clocks; Delta modulation; Dynamic range; GSM; Gain control; Telephony;
Journal_Title :
Solid-State Circuits, IEEE Journal of
