Gain scaling of oversampled analog-to-digital converters

Details Gain scaling of oversampled analog-to-digital converters Gain scaling of oversampled analog-to-digital converters

1987-10-02

1989-07-25

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

375 28, H03M 302

Patent

active

048518417

ABSTRACT:
Method of operation of an A/D converter having an oversampling front end quantizer coupled to a digital decimation filter. The method includes setting an effective feedback reference voltage to a value that is a predetermined factor greater than a specified maximum analog input voltage; and increasing the gain of the digital decimation filter by an amount substantially equal to the predetermined factor. In accordance with another aspect of the invention, an A/D converter includes a delta-sigma modulator wherein the full-scale analog input voltage is set below a maximum effective feedback reference voltage by a predetermined factor; and, the impulse-response coefficients of a digital decimation filter coupled to the output of the delta-sigma modulator are selected to provide full-scale digital output when a full-scale analog input voltage is applied to the analog voltage input.

REFERENCES:
patent: 4439756 (1984-03-01), Shenoi et al.
J. D. Everard; "A Single Channel POM Codec"; International Conference on Communications, Toronto, Canada; June 1978.

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