Wave transmission lines and networks – Attenuators
Patent
1975-12-05
1977-04-19
Gensler, Paul L.
Wave transmission lines and networks
Attenuators
325319, 325387, 330 29, 330145, H03H 724, H03G 300, H04N 552
Patent
active
040191605
ABSTRACT:
In a tuner for a television receiver, an attenuator circuit coupling a signal input to a signal output network includes a series connected controllable impedance and amplifier stage connected to a source of AGC potential whereby increased signal strength causes an increased AGC potential which reduces current flow through and increases the impedance of the controllable impedance while reducing the gain, and consequently the noise, of the amplifier stage coupled to the signal output network.
In another aspect of the invention, a second attenuator circuit includes a second controllable impedance series coupling a signal input to the attenuator circuit and a third controllable impedance coupling the junction of the first and second controllable impedances to circuit ground for effecting an additional increased attenuation of a received signal.
REFERENCES:
patent: 3428910 (1969-02-01), Webb
patent: 3624561 (1971-11-01), Tongue
patent: 3800229 (1974-03-01), Backwinkel et al.
patent: 3813602 (1974-05-01), Van Dijum et al.
Buffton Thomas H.
Gensler Paul L.
GTE Sylvania Incorporated
O'Malley Norman J.
Orner Robert T.
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