Wave transmission lines and networks – Automatically controlled systems
Patent
1989-09-22
1990-08-28
Gensler, Paul
Wave transmission lines and networks
Automatically controlled systems
333215, 03H 1104, H03H 1104
Patent
active
049528912
ABSTRACT:
A filter circuit (2) is automatically tuned so that the positions of the poles and zeros of its frequency response characteristic are maintained in substantially fixed ratios to an input frequency (f.sub.r). The arrangement comprises a frequency discriminator (1) having its output (5) coupled to a controllable element (8) of a resonant circuit included therein, so that the resonant frequency of the resonant circuit is maintained equal to the input frequency. The output 5 also controls a counterpart (13) to element (8), which counterpart is included in an auxiliary circuit (3). The filter circuit is tuned by controlling an element (10) included therein, which element also has a counterpart element (14) included in the auxiliary circuit, both of these elements (10,14) being controlled by the auxiliary circuit output signal. The auxiliary circuit output signal is determined by the ratio between parameters of the respective counterpart elements (13,14), which correspond to parameters of the tuning elements (8,10) which govern the tuning frequencies, and acts to maintain this ratio, and hence the aforementioned ratios, substantially constant.
REFERENCES:
patent: 3783409 (1974-01-01), Polson, Jr.
patent: 3997856 (1976-12-01), Canning et al.
Franzblau Bernard
Gensler Paul
U.S. Philips Corporation
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