Logarithmic analog to digital converter
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United States of America Patent
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Nov 25, 1986
Grant Date -
N/A
app pub date -
Sep 28, 1984
filing date -
Sep 28, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for converting an analog input signal to a digital output signal equal to the logarithm of the ratio of the input signal to a reference signal includes a method and apparatus for counting the cycles from a fixed frequency source for the time required for a capacitor to discharge through a resistor from a reference voltage to a calibration voltage; storing the result; counting the cycles from the same fixed frequency source for the time required for the capacitor to discharge through the resistor from the reference signal to the input signal and dividing the result by the stored result.
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