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Title: Bandpass sigma-delta modulator
Authors: XU, YONG-PING 
Issue Date: 25-Apr-2006
Citation: XU, YONG-PING (2006-04-25). Bandpass sigma-delta modulator. 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 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.
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