Gain scaling of oversampled analog-to-digital converters
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United States of America Patent
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Jul 25, 1989
Grant Date -
N/A
app pub date -
Oct 2, 1987
filing date -
Oct 2, 1987
priority date (Note) -
Expired
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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.
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