Title :
Combining subband decomposition and sigma delta modulation for wideband A/D conversion
Author :
Cormier, Ronald F., Jr. ; Sculley, Terry L. ; Bamberger, Roberto H.
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA, USA
fDate :
30 May-2 Jun 1994
Abstract :
This paper describes a method of digitizing a wide-band signal by performing subband decomposition via a bank of tuned bandpass sigma-delta modulators. Each modulator only converts a portion of the signal spectrum, increasing the effective oversampling ratio for the wide-band signal by the number of parallel modulators. A prototype bandpass ΣΔ modulator with a programmable noise null was fabricated in a 2 μm CMOS process and used to construct a four channel parallel A/D conversion system
Keywords :
modulators; sigma-delta modulation; 2 micron; A/D conversion; CMOS process; digitization; four channel system; oversampling ratio; parallel modulators; programmable noise; sigma delta modulation; signal spectrum; subband decomposition; tuned bandpass modulators; wide-band signal; Band pass filters; Bandwidth; Circuits; Delta modulation; Delta-sigma modulation; Digital filters; Digital modulation; Sampling methods; Signal resolution; Wideband;
Conference_Titel :
Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-1915-X
DOI :
10.1109/ISCAS.1994.409381
