Filter circuit arrangement

Details Filter circuit arrangement Filter circuit arrangement

1980-04-28

1981-09-15

Gensler, Paul L.

Wave transmission lines and networks

Negative resistance or reactance networks of the active type

Simulating specific type of reactance

330109, H03H 1108

Patent

active

042900360

ABSTRACT:
In a filter circuit a reactance is simulated by a voltage amplifier the input of which is connected across a reactive element and the output of which is connected in series with that element, thereby enabling, for example, the series arrangement of a pair of inductances to be simulated by a single capacitively-loaded gyrator (15, 16, 7) and a voltage amplifier (15, 8). The circuit shown simulates a series-resonant circuit fed via a series inductor and is suitable for use as a sound trap in a television receiver. A current proportional to the voltage across the unloaded port (8) of the gyrator (15, 16) generates a corresponding voltage across a load resistor (12) and this voltage is injected effectively in series with any voltage present across a pair of input terminals (1, 2) by means of a differential voltage amplifier (13).

REFERENCES:
patent: 3559105 (1971-01-01), Kurth

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