Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1986-06-27
1989-08-15
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341118, H03M 174
Patent
active
048579300
ABSTRACT:
A switched capacitor array (20) for use in a digital-to-analog converter (10), an analog-to-digital converter (60), or other digitally controlled circuit is disclosed. The array includes a plurality of switched capacitors (C(0) through C(15)) of substantially identical value, each having a switched terminal. Logic circuitry (17) responsive to a digital input signal (A) having a value N provides a logic output signal indicative of the digital input signal. Gating circuitry (40) responsive to the logic output signal switches the switched terminal of a selected switched capacitor to an analog signal provided by a digital-to-analog converter stage of lesser weight, and sequentially switches the switched terminals of a predetermined number of the switched capacitors to a predetermined voltage. The selected capacitor and such predetermined number of capacitors are determined by the value N of the digital input signal.
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Yee, Adaptive Reference Voltage Adjustment for an Analog-To-Digital Converter, IBM Tech. Discl. Bull., vol. 19, No. 6, 11/1976, pp. 2360-2362.
Timbie et al., Principles of Electrical Engineering, J. Wiley & Sons, Inc., 1922, pp. 310 & 311.
Gudmestad Terje
Hoff Marc S.
Hughes Aircraft Company
Meltzer Mark J.
Shoop Jr. William M.
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