Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1993-08-05
1995-02-21
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341155, 364825, 333166, H03M 304
Patent
active
053920422
ABSTRACT:
A sigma-delta (.SIGMA..DELTA.) analog-to-digital converter (ADC) accepts band-limited analog signals, and subtracts an analog replica of an output pulse- or amplitude-density modulated (ADM) signal therefrom to produce an error signal. The error signal is processed by an analog filter or resonator with a nondelayed forward path and a tapped nonaccumulating delay line, and summed feedback and feedforward weights coupled to the taps, to thereby produce a resonated signal. An ADC processes the resonated signal, and produces the ADM signal. The ADC undesirably produces quantization noise. A digital-to-analog converter (DAC) noiselessly converts the PDM signal into the analog replica, to aid in forming the error signal. In a particular embodiment of the invention, the resonator includes a recursive analog transversal filter with delays and linear weighting elements for linearity and high operating speed. The ADC may be in a high-speed system such as a radar.
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Martin Marietta Corporation
Meise W. H.
Nieves C. A.
Williams Howard L.
Young S. A.
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