ΔΣ-type A/D converter

Details ΔΣ-type A/D converter ΔΣ-type A/D converter

2011-05-31

2011-05-31

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S131000

Reexamination Certificate

active

07952506

ABSTRACT:
There is provided a technique for reducing the adverse effect of idle tones in the channels in a ΔΣ-type A/D converter including a plurality of channels for converting analog input signals into digital signals. The ΔΣ-type A/D converter includes an L channel for converting a left analog input signal into a digital signal and an R channel for converting a right analog input signal into a digital signal. Each of the L channel and the R channel includes a DC dither circuit for generating a DC addition voltage for shifting the frequency of an idle tone. In the L channel and the R channel, DC addition voltages generated by DC dither circuits are different from each other.

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Schreier, Richard et al., “Understanding Delta-Sigma Data Converters,” IEEE Press, 2005, pp. 41-49 with English Translation.

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