Variable gain amplifiers

Details Variable gain amplifiers Variable gain amplifiers

1977-06-10

1978-07-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330291, 330294, 333 18, 333 28R, H03G 330

Patent

active

041032470

ABSTRACT:
An automatic equalizer is described including a first transistor to the input of which a cable is coupled and which is branched in common emitter configuration and a second transistor branched in common collector configuration a collector of the first transistor being coupled to the base of the second transistor and the emitters of the transistors being intercoupled through a positive feedback circuit. In variation by small variation of a variable which is substantially independent from active parameters of the transistors results in a gain variation which is independent of the cable length in the lower frequency region and utilizes no coils.

REFERENCES:
patent: 3665331 (1972-05-01), Wiarda et al.

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