Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1991-05-20
1992-09-15
Logan, Sharon D.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341145, H03M 114, H03M 168
Patent
active
051481693
ABSTRACT:
A method for converting a sampled signal of an analog input signal to a digital output signal that is L data bits in length is provided. The method includes the steps of: a) converting the sampled signal to a digital reference signal of M<L data bits in length only during a sampling period that is a portion of a work cycle; b) maintaining the digital reference signal until a subsequent sampling period; c) converting the digital reference signal back to an analog reference signal; d) subtracting the analog reference signal from the sampled signal to form a difference signal but suppressing the subtracting step if a level of the sampled signal falls below a minimum quantization level for converting the sampled signal to a digital reference signal; e) amplifying and converting the difference signal to a digital partial signal of N data bits in length, where M<N<L; and f) summing the digital reference signal and the digital partial signal to yield the digital output signal having L data bits, the output signal having most significant bits formed by the digital reference signal and least significant bits formed by the digital partial signal, wherein a sum of a number of data bits of the digital reference signal and the partial signal is not less than a number of data bits of the digital output signal.
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Bustance C. David
Lancaster John
Lidbetter Paul
Logan Sharon D.
Siemens Aktiengesellschaft Osterreich
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