Parasitic capacitance compensation in CMOS-switched active filte

Details Parasitic capacitance compensation in CMOS-switched active filte Parasitic capacitance compensation in CMOS-switched active filte

1980-02-13

1981-11-17

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, H03F 134

Patent

active

043014194

ABSTRACT:
Method and apparatus for compensation of switched resistance active filters o maintain a relatively constant Q and voltage gain by switching additional resistors in and out of the filter circuit. Solid state circuitry provides signals for activating switches to switch the compensating resistances as the operating frequency of the filter is altered. Compensation depends essentially on the number of open switches in the frequency selecting resistance array rather than on frequency of operation. An approximate approach reduces the number of resistances and switches needed for compensation, yet provides minimal error.

REFERENCES:
patent: 3715678 (1973-02-01), Reichard

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