Pole quality factor (Q) enhancement technique for notch filters

Details Pole quality factor (Q) enhancement technique for notch filters Pole quality factor (Q) enhancement technique for notch filters

1979-05-09

1980-12-30

Mullins, James B.

Amplifiers

Signal feedback

Frequency responsive feedback means

330101, H03F 134

Patent

active

042426421

ABSTRACT:
An enhanced pole quality factor (Q) notch filter section circuit includes an active biquadratic notch filter section and a pole quality factor enhancement amplifier responsive to the output of the biquadratic notch filter section for providing at the input of the biquadratic notch filter section negative feedback in pass and stop bands of frequencies and positive feedback in the transition range of frequencies between the pass and stop bands of frequencies.

REFERENCES:
patent: 3223941 (1965-12-01), Schroeder et al.
Valley et al., Vacuum Tube Amplifiers, vol. 18, Published 1948, McGraw-Hill, pp. 391-397.
Revankar et al., "A New High-Q Active Bandpass Filter with Low-Gain Stages," International Journal of Electronics, vol. 42, No. 2, Feb. 1977, pp. 111-116.

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