Analogue-to-digital converter

Details Analogue-to-digital converter Analogue-to-digital converter

1988-03-10

1989-12-26

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341118, H03M 1300

Patent

active

048901075

ABSTRACT:
An analogue-to-digital converter in accordance with the invention comprises a feed-forward arrangement in which, in a first stage, the analogue input signal is applied via a filter to a subtractor along a first path and is applied via a second path to an analogue-to-digital converter followed by a digital filter and then converted back into analogue form to be applied via a bandpass filter to the subtractor. The output of the subtractor is therefore an error signal representative of the difference between the analogue input signal and the predicted signal in analogue form. The error signal is applied to an analogue-to-digital converter and is combined with the predicted signal in digital form taken from the output of the digital filter via another filter to produce the digital output signal. Control means are provided to provide phase and gain matching between different parts of the circuit. The digital filter is such that its output noise spectrum is arranged to be shaped so as to include a null around the quarter sampling frequency, enabling the following D-A converter to be of low resolution.

REFERENCES:
patent: 3967269 (1976-06-01), Fletcher
"Notes on Analog-Digital Conversion Techniques", Alfred K. Susskind, 1957, pp. 1-6, The Technology Press, M.I.T.

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