Enhanced quadrature notch filter

Details Enhanced quadrature notch filter Enhanced quadrature notch filter

1985-12-10

1988-03-15

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307512, 328139, 333176, H03B 100, H03K 500

Patent

active

047315873

ABSTRACT:
An enhanced quadrature notch filter which is capable of rejecting an undesired signal component of an input signal, generally comprising a quadrature phase splitter for producing first and second reference signals which have substantially the same frequency as the undesired signal component but which are 90.degree. out of phase with each other, a pair of amplitude control loops for adding the first and second reference signals to the input signal in amplitudes which will cancel the undesired signal component, and a phase locked loop circuit for maintaining a predetermined phase relationship between the undesired signal component and one of the first and second reference signals.

REFERENCES:
patent: 3202990 (1965-08-01), Howells
patent: 3353147 (1967-11-01), Meeker, Jr.
patent: 3355668 (1967-11-01), Boensel et al.
patent: 3633117 (1972-01-01), Reilly, Jr.
patent: 3659212 (1972-04-01), Saliga
patent: 3912916 (1975-10-01), Grun et al.
"Adaptive Arrays-An Introduction", by William F. Gabriel, Proceedings of the IEEE, vol. 64, No. 2, Feb. 1976.

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