Active filter for providing improved notch and band pass filters

Details Active filter for providing improved notch and band pass filters Active filter for providing improved notch and band pass filters

1978-02-09

1979-05-29

Dahl, Lawrence J.

Amplifiers

Signal feedback

Frequency responsive feedback means

330 85, 330108, H03F 136

Patent

active

041568532

ABSTRACT:
An active filter is disclosed for providing improved notch and band pass filters. The output to input frequency response of an active filter is mathematically expressed as a ratio of two polynominals in the Laplace operator S. In any notch filter, the coefficient of the S term in the numerator must be reduced to zero, while in any band pass arrangement the coefficient of the S term in the denominator is reduced to zero. The improved notch filter provides an input circuit for the operational amplifier portion of the filter which eliminates the S term in the numerator so that adjustments to reduce this term are unnecessary. Similarly, in the improved band pass filter, the S term in the denominator is eliminated in the feedback circuit provided for the operational amplifier, so that adjustment is unnecessary to eliminate the coefficient of S.

REFERENCES:
patent: 3356962 (1967-12-01), Morgan

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