Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1987-10-14
1989-08-08
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341118, 341131, H03M 112
Patent
active
048557455
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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Van de Plassche, A Sigma-Delta Modulator as an A/D Converter, IEEE Transactions of Circuits and Systems, vol. CAS-25, No. 7, Jul. 1978, pp. 510-514.
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Hoff Marc S.
Shoop Jr. William M.
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