Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1975-02-25
1977-02-08
Claffy, Kathleen H.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
179 16F, 330 86, H04B 336
Patent
active
040073408
ABSTRACT:
Apparatus for electrically communicating between a given location and a variably spaced apart remote location, the locations being connected via electrical conductors. A variable gain amplifier is connected in series between the spaced apart locations for variably amplifying the signals communicated therebetween. A gain control signal that is a function of the separation between the locations is generated and applied to the variable gain amplifier to vary the gain of the amplifier in accordance with the distance between the locations. The gain control signal is proportional to the effective resistance of the electrical conductors extending between the locations. The gain of the amplifier is varied by varying the transconductance of a transconductance amplifier connected in the amplifier feedback circuit in accordance with the gain control signal.
REFERENCES:
patent: 3578914 (1971-05-01), Simonelli
patent: 3689704 (1972-09-01), Wadding
patent: 3731012 (1973-05-01), Shaffer
patent: 3781481 (1973-12-01), Shaffer et al.
patent: 3903378 (1975-09-01), Lee et al.
Claffy Kathleen H.
Edison Control Corporation
Eslinger Lewis H.
Myers Randall P.
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