Method and apparatus for tuning a continuous time filter
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United States of America Patent
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Jun 22, 1999
Grant Date -
N/A
app pub date -
Aug 8, 1997
filing date -
Aug 8, 1997
priority date (Note) -
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Abstract
A tuning circuit for generating a digital code to be used to calibrate a capacitor array of the type used in active RC filters is comprised of a single-slope A/D converter with fixed reference voltages as inputs and an output value which is dependent on the RC product of a resistor and capacitor within the converter. A decoder converts the RC product as measured by the A/D converter into a digital code which, when applied to the appropriate capacitor array, sets the array capacitance to compensate for the difference between the measured RC product and the nominal design value.
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