Analog to digital converter and method of calibrating same
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United States of America Patent
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-
Aug 10, 1982
Grant Date -
N/A
app pub date -
Nov 21, 1979
filing date -
Nov 21, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A single slope analog to digital converter uses a DAC to trim the discharge current of a capacitor during calibration thereof. A method of calibrating the analog to digital converter is provided which iterates required steps to obtain a correct current setting within a short period of time. The analog to digital converter discharges a capacitor through a high impedance to obtain a linear discharge. The time to discharge the capacitor appears in a counter and is indicative of the voltage across the capacitor at the beginning of the discharge period once the analog to digital converter has been calibrated.
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