Method of controlling analog-to-digital converter

Details Method of controlling analog-to-digital converter Method of controlling analog-to-digital converter

1997-07-07

1999-03-02

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341122, H03M 134

Patent

active

058777199

ABSTRACT:
A method of controlling an analog-to-digital (A/D) converter for converting an input voltage into digital data. The conversion process includes charging a capacitor with the input voltage to be converted into a digital data, and disconnecting the input voltage from the capacitor. A reference voltage, generated according to digital data, is furnished by a control circuit to a digital-to-analog (D/A) converting unit. The reference voltage is applied to the capacitor by turning on a switch connected between the D/A converting unit and the capacitor. New digital data to be furnished by the control circuit is determined according to a charged voltage on the capacitor. The D/A converting unit causes the reference voltage to be delivered to the capacitor to change to a new value according to the new digital data from the control circuit. Before the reference voltage begins a transition to a new value, the switch is turned off and kept off until the reference voltage from the D/A converting unit becomes stable at the new value.

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