Analog-to-digital converter signal storage capacitor perturbatio

Details Analog-to-digital converter signal storage capacitor perturbatio Analog-to-digital converter signal storage capacitor perturbatio

1996-06-17

1998-02-10

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341156, H03M 112

Patent

active

057173966

ABSTRACT:
There is disclosed an integrated circuit in accordance with an illustrative embodiment of the present invention, method of operating a digital converter includes a capacitor on which a sampled analog signal is stored. The capacitor has a first element and a second element. The second element is capable of being referenced to more than one potential. The analog-to-digital converter includes a voltage gradient and a comparator for comparing the sampled analog signal to selected voltages of the voltage gradient to indicate which is larger. Each of the voltages developed along the voltage gradient corresponds to a digital code representative of the voltage. The method includes storing a sampled analog signal on the capacitor with the second element of the capacitor referenced to a first potential, comparing the sampled analog signal to at least one selected voltage developed along the voltage gradient to develop a comparison signal indicative of the relative magnitudes of the sampled analog signal and the selected voltage, and referencing the second element of the capacitor to a second potential in response to the comparison signal.

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"Analog-Digital Conversion Handbook", Third Edition, by the Engineering Staff of Analog Devices, Inc., published by Prentice-Hall, Englewood Cliffs, NJ 07632, Edited by Daniel H. Sheingold, 1986, pp. 218-219, 355, 420-426.

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