Method and apparatus for analog-to-digital conversion

Details Method and apparatus for analog-to-digital conversion Method and apparatus for analog-to-digital conversion

H - Electricity

03

M

354/81

H03M 1/00 (2006.01)

Patent

CA 1234219

ABSTRACT OF THE DISCLOSURE One analog signal is selected out of a plurality of analog signals by a multiplexer and a capacitor is electrically charged through such a switch as adapted to be closed/opened by a start signal, and thereafter the capacitor is caused to discharge with a constant current with the switch opened. A level discrim- inating signal is led out when a voltage of the capacitor dis- charging goes below a predetermined discriminating level after the switch is opened. A stop signal is generated as a result of a logical operation of the analog signal and the level discrimi- nating signal by an AND gate. A processing circuit accepts the stop signal and calculates a digital value corresponding to a time period from the time that the switch is opened to the time that the level discriminating signal is generated, and then moves to a subsequent processing operation.

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