Signal attenuator

Details Signal attenuator Signal attenuator

1990-12-31

1992-06-30

Gensler, Paul

Wave transmission lines and networks

Attenuators

4552491, H03H 725

Patent

active

051267039

ABSTRACT:
A first PIN diode is connected to the input side of a tuner at the front end of an FM receiver, in an AC coupled fashion parallel to the tuner. A correction inductance is connected parallel to the first PIN diode in an AC coupled fashion. The tuner is connected, at its output side, parallel to a series-connected circuit of a correction capacitor and a second PIN didode. The anodes of the first and second PIN diodes are supplied with an automatic gain control (AGC) voltage. When the AGC voltage varies, the resistances of the first and second PIN diodes vary in a manner to adjust the degree to which the correction inductance and the correction capacitor affect the resonance in the tuner.

REFERENCES:
patent: 3534278 (1970-10-01), Bodtmann
patent: 4019160 (1977-04-01), Kam
patent: 4378536 (1983-03-01), Schwaremann
patent: 4494076 (1985-01-01), Rinderle

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