Adjustable and selective electrical filters and methods of tunin

Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters

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Details

328167, 331138, 333171, H03H 707, H03H 709, H03H 1104, H03B 526

Patent

active

044172206

ABSTRACT:
A notch filter is provided with an ancillary circuit including a non-inverting amplifier and a coupling which enables the filter to form part of an oscillatory loop of which the frequency of oscillation corresponds to the frequency of maximum rejection by the notch filter. Measurement of that frequency facilitates the tuning of the notch filter, which includes capacitors constituted by varactor diodes. The gain of the ancillary circuit may be adjusted to change its mode of operation from oscillation to that of a tuned amplifier so that a sweep of the center frequency of the notch filter through a range of interest facilitates a search for an unknown interfering frequency and the simultaneous tuning of the notch filter to reject that interference.

REFERENCES:
patent: 3072868 (1963-01-01), Lucka et al.
patent: 3193774 (1965-07-01), Clapper
patent: 3193777 (1965-07-01), Carter et al.
patent: 3249876 (1966-05-01), Harrison
patent: 3535649 (1970-10-01), Szabo
patent: 3684977 (1972-08-01), Viles
patent: 3838351 (1974-09-01), Hekimian

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