Method and circuit for reducing quantizer input/output swing...

Details Method and circuit for reducing quantizer input/output swing... Method and circuit for reducing quantizer input/output swing...

2005-09-06

2005-09-06

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S156000, C341S176000

Reexamination Certificate

active

06940438

ABSTRACT:
Disclosed is a circuit and method for reducing output swing in a sigma delta modulator. The quantizer output swing reduction circuit and method of the present invention advantageously enables the modulator to have a larger input/output swing range without degrading the SNR and SFDR performance. One embodiment of the present invention comprises a conventional sigma-delta modulation circuit (100) and a quantizer swing reduction block (210). The quantizer swing reduction block (210) comprises an input signal Vx (216), a signal processing block (214) with transfer function H3and another signal processing block (215) with transfer function H2*H3.

REFERENCES:
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patent: 5654711 (1997-08-01), Fujimori
patent: 6111531 (2000-08-01), Farag
patent: 6271782 (2001-08-01), Steensgaard-Madsen
patent: 6400297 (2002-06-01), Tucker
patent: 6696998 (2004-02-01), Ying et al.
patent: 6762703 (2004-07-01), Tabatabaei
patent: 6809672 (2004-10-01), Gupta

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