Method and apparatus for tuning a continuous time filter

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

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Details

327552, 333172, 330305, H03K 500, H03M 112

Patent

active

059146338

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.

REFERENCES:
patent: 5245646 (1993-09-01), Jackson et al.

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