Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/35464
Title: BANDPASS SIGMA-DELTA MODULATOR WITH ANTI-RESONANCE CANCELLATION
Authors: XU, YONG PING 
SUN, WAI HOONG
WANG, XIAOFENG
WANG, ZHE 
LIW, SEAN IAN SAXON
Issue Date: 22-May-2003
Source: XU, YONG PING,SUN, WAI HOONG,WANG, XIAOFENG,WANG, ZHE,LIW, SEAN IAN SAXON (2003-05-22). BANDPASS SIGMA-DELTA MODULATOR WITH ANTI-RESONANCE CANCELLATION. ScholarBank@NUS Repository.
Abstract: A bandpass sigma-delta modulator using acoustic resonators or micro-mechanical resonators. In order to improve resolution at high frequencies, acoustic resonators. In order to improve resolution at high frequencies, acoustic resonators or micro-mechanical resonators are utilized in a sigma-delta modulator instead of electronic resonators. The quantized output is fed back using a pair of D/A converters to an input summation device. In fourth order devices, the feed back is to two summation devices in series. Such a sigma-delta modulator is usable in a software defined radio cellular telephone system and in other applications where high-frequency and high-resolution A/D conversion is required. A cancellation circuit may remove the anti-resonance signal from a resonator. An anti-resonance cancellation circuit removes the anti-resonance from the output of the resonators by providing a signal which is subtracted from the output of the resonator. The cancellation circuit includes a capacitor which is matched to the static capacitance of the resonator. The loads of the resonator and cancellation network are also matched.
URI: http://scholarbank.nus.edu.sg/handle/10635/35464
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