Switched capacitor filter for use with a digital-to-analog (D/A)

Details Switched capacitor filter for use with a digital-to-analog (D/A) Switched capacitor filter for use with a digital-to-analog (D/A)

1987-04-20

1990-11-06

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341122, 341144, H03M 166

Patent

active

049689894

ABSTRACT:
The output of a digital-to-analog (D/A) converter is coupled to the input of a filter. The D/A converter is initialized each time a new digital word is applied to the D/A converter for conversion, whereby each data conversion cycle (T.sub.D) includes an initialization interval (T.sub.I) followed by a conversion interval (T.sub.C). During T.sub.I the output of the D/A converter is driven to a reference level and during T.sub.C to the output of the D/A converter corresponds to the value of the input signal. The input section of the filter stores the D/A output just prior to initialization and, for during T.sub.I, coupling the stored value within the filter for processing while inhibiting the coupling to the filter of the reference level present at the D/A output.

REFERENCES:
patent: 3051938 (1962-08-01), Levy
patent: 3597761 (1971-08-01), Fraschilla et al.
patent: 4363025 (1982-12-01), Jackson
patent: 4483017 (1984-11-01), Hampel et al.
patent: 4573033 (1986-02-01), Kolodin
patent: 4584559 (1986-04-01), Penney
patent: 4633223 (1986-12-01), Senderowicz

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