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Dual-Band Sigma-Delta Modulator for Wideband Receiver Applications

Jen-Shiun CHIANG, Pao-Chu CHOU, Teng-Hung CHANG

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Summary :

This work presents a new sigma-delta modulator (SDM) architecture for a wide bandwidth receiver. This architecture contains dual-bandwidth for W-CDMA and GSM system applications. Low-distortion swing-suppressing SDM and interpolative SDM cascaded units are used together. Using the low-distortion swing-suppressing technique, the resolution can be improved even under non-linearity effects. The interpolative SDM extends the signal bandwidth and represses the high-band noise. The SDM used in the W-CDMA and GSM applications was designed and simulated using 0.25-µm 1P5M CMOS technology. The simulated peak SNDR of W-CDMA and GSM are 72/70 dB and 82/84 dB in Low-IF/Zero-IF standards.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E87-A No.2 pp.311-323
Publication Date
2004/02/01
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
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