Title :
A 950-MHz IF second-order integrated LC bandpass delta-sigma modulator
Author :
Gao, Weinan ; Snelgrove, W. Martin
Author_Institution :
Dept. of Electron., Carleton Univ., Ottawa, Ont., Canada
fDate :
5/1/1998 12:00:00 AM
Abstract :
A second-order integrated LC bandpass delta-sigma modulator is presented. This modulator is implemented in a 0.5-μm bipolar process and can be used for digitizing radio frequency or high intermediate frequency signals. It employs an integrated LC resonator with active Q-enhancement and two nonreturn-to-zero digital-to-analog pulse-shaping feedback loops. The modulator test chip achieves a signal-to-noise ratio of 57 dB over a 200-kHz bandwidth for converting a 950-MHz signal, and dissipates 135 mW with a 5-V supply
Keywords :
bipolar integrated circuits; circuit feedback; pulse shaping circuits; resonators; sigma-delta modulation; 0.5 micron; 135 mW; 200 kHz; 5 V; 950 MHz; LC bandpass delta-sigma modulator; active Q-enhancement; bipolar process; integrated LC resonator; intermediate frequency signals; nonreturn-to-zero digital-to-analog pulse-shaping feedback loops; radio frequency signals; signal-to-noise ratio; Analog-digital conversion; Delta modulation; Digital modulation; Feedback loop; Frequency conversion; Inductors; RF signals; Radio frequency; Resonator filters; Signal processing;
Journal_Title :
Solid-State Circuits, IEEE Journal of
