A/D Conversion circuit with carrier frequency removing feature

Details A/D Conversion circuit with carrier frequency removing feature A/D Conversion circuit with carrier frequency removing feature

2008-07-08

2008-07-08

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

07397406

ABSTRACT:
The present invention is intended to fully remove a carrier-frequency component despite a compact low-cost configuration. An A/D conversion circuit with a carrier frequency removing feature includes: an A/D converter including a voltage comparator that compares a first signal with a feedback signal and a voltage feedback circuit that produces the feedback signal; a one-input N-output demultiplexer that receives the feedback signal; N integrators that calculate the respective integrals of N output signals of the demultiplexer; an N-input one-output multiplexer that receives the outputs of the N respective integrators; a subtractor that produces a difference between an analog signal and the output signal of the multiplexer; an amplifier that amplifies the output signal of the subtractor to produce the first signal; and a switching control circuit that cyclically switches the input terminals of the multiplexer and the output terminals of the demultiplexer synchronously with a carrier wave.

REFERENCES:
patent: 4081800 (1978-03-01), Amemiya
patent: 4195283 (1980-03-01), Ishikawa
patent: 4754257 (1988-06-01), Takahashi
patent: 5561425 (1996-10-01), Therssen
patent: 5999574 (1999-12-01), Sun et al.
patent: 6483867 (2002-11-01), Mannermaa
patent: 6873272 (2005-03-01), Pezzini
patent: 2006/0215541 (2006-09-01), Kwun et al.
patent: 2004-057525 (2004-02-01), None

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