High resolution analog-to-digital converter
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United States of America Patent
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Aug 8, 1989
Grant Date -
N/A
app pub date -
Oct 14, 1987
filing date -
Oct 14, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus to convert an input analog signal into a high resolution digital signal in a short conversion time. The device utilizes a high resolution feedback circuit to reduce the high clock generally necessary for high resolution analog-to-digital conversion. Such a device utilizes a low resolution analog-to-digital circuit, which is the only component that must operate at a high clock rate. The device amplifies the difference between the input signal and the feedback signal to obtain a first high resolution digital signal. The device further improves the resolution by combining a dither signal with the amplified difference between the feedback signal and the input digital signal to update the first high resolution digital signal. This updated digital signal is successively added in an accumulator to obtain a higher resolution digital signal.
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