Delta-sigma A/D converter

Details Delta-sigma A/D converter Delta-sigma A/D converter

2011-07-19

2011-07-19

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000, C341S144000

Reexamination Certificate

active

07982647

ABSTRACT:
An object of the present invention is to provide a highly accurate delta sigma A/D converter. Disclosed is a delta sigma A/D converter including: a first integration circuit to generate a first signal on the basis of an input signal and a first feedback signal from an output side; a first signal conversion circuit to convert the first signal into a first converted signal; a loop delay compensation circuit to generate a compensation signal and then to output the compensation signal in response to a second feedback signal fed back from the output side at a timing earlier than that of the first feedback signal; an adder circuit to add the first converted signal and the compensation signal; and a comparator to generate a digital signal on the basis of an output signal from the adder circuit. The loop delay compensation circuit includes a compensation signal conversion circuit to generate the compensation signal. The compensation signal conversion circuit and the first signal conversion circuit have the approximately same rate of change in conversion coefficient depending on a temperature.

REFERENCES:
patent: 7495593 (2009-02-01), Wang
patent: 7545301 (2009-06-01), Kim et al.
patent: 2006-41992 (2006-02-01), None
Shouli Van and Edgar Sanchez-Sinencio, “A Continuous-Time ΣΔModulator With 88-dB Dynamic Range and 1.1-MHz Signal Bandwidth, ” IEEE Jouirnal of Solid-State Circuits, Jan. 2004, vol. 39, No. 1, p. 75-86.

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