Adaptive-type sigma-delta A/D converter

Details Adaptive-type sigma-delta A/D converter Adaptive-type sigma-delta A/D converter

2006-06-13

2006-06-13

Nguyen, Linh V. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S172000

Reexamination Certificate

active

07061416

ABSTRACT:
A sigma-delta A/D converter includes an A/D converter configured to output a digital signal, a signal-magnitude detecting circuit coupled to the output of the A/D converter to output a control signal responsive to a magnitude indicated by the digital signal, a D/A converter coupled to the output of the A/D converter and the output of the signal-magnitude detecting circuit to output an analog signal having a signal level responsive to the digital signal and the control signal, a differential circuit coupled to an external analog input and the output of the D/A converter to output a differential between the external analog input and the analog signal, and a filter circuit to couple between the output of the differential circuit and an input of the A/D converter, wherein the D/A converter is configured to control, in response to the control signal, a capacitance of a capacitor that discharges following charging of electric charge to supply an electric current of the analog signal.

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“Adaptive Sigma-Delta Modulation with One-Bit Quantization”, Zierhofer,IEEE Transactions on Circuits and Systems II: Analog to Digital Signal Processing,vol. 47, No. 5, pp. 408-415, May 2000.

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