Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1990-02-23
1994-07-19
Barron, Jr., Gilberto
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333 171, 333176, 307521, H03H 701, H03H 1702
Patent
active
053312996
ABSTRACT:
An automatic tracking notch filter system tracks a large-magnitude narrow band signal through frequency effectively eliminating it. A frequency variable notch filter is responsive to a control input at which is applied a small amplitude AC dither signal. The resulting fluctuation in frequency of the notch filter causes corresponding fluctuations in the magnitude of the notch filter output. The output signal is rectified and band pass filtered around the dither frequency before being demodulated with the dither signal to provide a DC error signal indicating the magnitude and direction in frequency of the filter misalignment. The error signal is integrated and input to the control input of the notch filter with the dither signal such that the notch filter tracks the narrow band signal in response to the feedback signal provided at its control input.
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W. B. Bridge et al., Coherent Optical Adaptive Techniques, Feb. 1974, vol. 13, No. 2, Applied Optics, pp. 291-300.
Barron Jr. Gilberto
Massachusetts Institute of Technology
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