Amplifier arrangement with variable gain factor

Details Amplifier arrangement with variable gain factor Amplifier arrangement with variable gain factor

1979-02-26

1981-09-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345, H03G 330

Patent

active

042900255

ABSTRACT:
An amplifier arrangement with a variable gain factor comprising a first and a second emitter-coupled transistor and a third and a fourth emitter-coupled transistor. The collector electrodes of the first and third transistor are coupled to an output of the amplifier arrangement. Between the interconnected base electrodes of the first and the fourth transistor and the interconnected base electrodes of the second and the third transistor a control signal can be applied. A signal current is applied to the interconnected emitter electrodes of the first and the second transistor and to the interconnected emitter electrodes of the third and the fourth transistor by means of a first and a second voltage-current converter, respectively, at least one of the two converters comprising a signal input and both converters having negative feedback to the output of the amplifier arrangement.

REFERENCES:
patent: 3750042 (1973-07-01), Peil et al.

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