发明名称 |
BANDPASS SIGMA-DELTA MODULATOR WITH ANTI-RESONANCE CANCELLATION |
摘要 |
<p>Bandpass Sigma-Delta Modulator With Anti-Resonance Cancellation 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.</p> |
申请公布号 |
SG146443(A1) |
申请公布日期 |
2008.10.30 |
申请号 |
SG20060027809 |
申请日期 |
2002.11.13 |
申请人 |
NATIONAL UNIVERSITY OF SINGAPORE |
发明人 |
XU, YONG PING;SUN, WAI HOONG;WANG, XIAOFENG;WANG, ZHE;LIW, SEAN IAN SAXON |
分类号 |
H03H9/02;H03H9/46;H03H9/54;H03H9/64;H03M3/02;(IPC1-7):H03H9/25;H04M3/00;H03H7/12 |
主分类号 |
H03H9/02 |
代理机构 |
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代理人 |
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地址 |
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