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A Study to Realize a 1-V Operational Passive Σ-Δ Modulator by Using a 90 nm CMOS Process

Toru CHOI, Tatsuya SAKAMOTO, Yasuhiro SUGIMOTO

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Summary :

A 1-V operational sigma-delta modulator with a second-order passive switched capacitor filter is designed and fabricated by using a 90 nm CMOS process. No gate-voltage bootstrapped scheme is adopted to drive analog switches, and the voltage gain of a comparator is chosen to be 94 dB. The experimental results show that the peak SNR reached 68.9 dB with a frequency bandwidth of 40 kHz when the clock was 40 MHz.

Publication
IEICE TRANSACTIONS on Electronics Vol.E90-C No.6 pp.1304-1306
Publication Date
2007/06/01
Publicized
Online ISSN
1745-1353
DOI
10.1093/ietele/e90-c.6.1304
Type of Manuscript
Special Section LETTER (Special Section on Analog Circuits and Related SoC Integration Technologies)
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