Three-order sigma-delta modulator

Details Three-order sigma-delta modulator Three-order sigma-delta modulator

2006-07-11

2006-07-11

Chin, Stephen (Department: 2631)

Pulse or digital communications

Pulse code modulation

Differential

C375S354000, C341S143000, C341S177000

Reexamination Certificate

active

07075995

ABSTRACT:
A three-order sigma-delta modulator having a feedback and a feedforward configuration. The three-order sigma-delta modulator includes: an analog-to-digital converter; a digital-to-analog converter; a first integrating network; a second integrating network connected in series to the first integrating network; a third integrating network connected in series to the second integrating network; and an adder, to combine a feedforward gain signal generated by passing the first output signal from the first integrating network through a feedforward gain unit with a modulation signal that is generated by passing the third output signal from the third integrating network through a modulation gain unit and to generate a desired noise transfer function.

REFERENCES:
patent: 5513209 (1996-04-01), Holm
patent: 5623263 (1997-04-01), Kuo et al.
patent: 5673044 (1997-09-01), Pellon
patent: 5682160 (1997-10-01), Ribner et al.
patent: 5859603 (1999-01-01), Noguchi et al.
patent: 6057793 (2000-05-01), Gong et al.
patent: 6275177 (2001-08-01), Ho et al.

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