Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1988-04-04
1988-11-01
Miller, Charles D.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
H03M 166
Patent
active
047823232
ABSTRACT:
A switched capacitor circuit for use in a digital-to-analog converter, an analog-to-digital converter, or other digitally controlled circuit is disclosed. The switched capacitor circuit includes first and second arrays (30, 40) of switched capacitors of substantially identical value, each capacitor having a switched terminal. The switched capacitor circuit further includes a decoding circuit (20) responsive to a digital input having a decimal value N for providing control signals for each of the capacitor arrays. Logic circuitry (33, 43, GC(I)) responsive to the control signals is included for sequentially switching the switched terminals of L and M capacitors respectively of the first and second switched capacitor arrays in a predetermined sequence so as to maintain the geometrical centroid of the switched capacitors at a substantially constant location, where the sum of L and M is equal to N.
REFERENCES:
patent: 3995304 (1976-11-01), Pease
patent: 4029949 (1977-06-01), Dew
McCreary "IEEE Journal of Solid-State Circuits" vol. sc-10, No. 6, Dec. 1975, pp. 371-379.
Maddox "Electronics" Apr. 4, 1974 pp. 125-130.
Float Kenneth W.
Hughes Aircraft Company
Karambelas A. W.
Miller Charles D.
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