Integrated filter circuit with variable frequency characteristic

Details Integrated filter circuit with variable frequency characteristic Integrated filter circuit with variable frequency characteristic

1985-04-10

1987-05-19

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307320, 328167, 328149, H03K 500, H03K 320, H03B 100

Patent

active

046671200

ABSTRACT:
A filter integrated circuit having a reference level generator circuit for attenuating its input signal and generating a reference level signal, a pseudofilter circuit including resistors and a variable capacitor as filter elements, and an error amplifier unit for comparing the level of the output signal of the reference level generator circuit with the level of the output signal of the pseudofilter circuit and for generating an automatic adjustment control signal in accordance with the level difference between the output signals. The automatic adjustment control signal is supplied to the pseudofilter circuit to change the capacitance value of the variable capacitor in the pseudofilter circuit so that the output signal level of the pseudofilter circuit may become equal to the level of the reference signal. The automatic adjustment control signal is also supplied to at least one filter circuit to change the capacitance of a variable capacitor included therein. As a result, the deviation in the filter characteristics caused by deviations in the resistance of a resistor and in the capacitance of the capacitor is corrected.

REFERENCES:
patent: 3562675 (1971-02-01), Urell
patent: 3761741 (1972-06-01), Hoeft
patent: 3946249 (1976-03-01), Nagami et al.
patent: 3969678 (1976-07-01), Asahara et al.
patent: 3986154 (1976-10-01), Yamada et al.
patent: 4316108 (1982-02-01), Rogers, Jr.

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