ΣΔ-analog-to-digital modulator and digital...

Details ΣΔ-analog-to-digital modulator and digital... ΣΔ-analog-to-digital modulator and digital...

2007-11-20

2007-11-20

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

11389426

ABSTRACT:
A ΣΔ analog-to-digital converter has a ΣΔ modulation section which executes ΣΔ modulation, and a digital filter which filters a digital signal output from the ΣΔ modulation section. The digital filter has gain properties that one of dips of a gain of the digital filter corresponds to a noise frequency which is, for example, the commercial frequency 60 Hz. Especially, the lowest frequency of the dips corresponds to the noise frequency.

REFERENCES:
patent: 4939516 (1990-07-01), Early
patent: 5349352 (1994-09-01), Saleh
patent: 5451949 (1995-09-01), Gundry
patent: 6418228 (2002-07-01), Terai et al.
patent: 5-37385 (1993-02-01), None
patent: 2004-247930 (2004-09-01), None

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