Variable gain amplifying circuit

Details Variable gain amplifying circuit Variable gain amplifying circuit

1995-02-23

1996-07-02

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, H03F 345

Patent

active

055326447

ABSTRACT:
A variable gain amplifying circuit is disclosed, which comprises a first transistor pair whose bases are connected to input terminals, a PN junction pair with bias currents that are collector currents of the first transistor pair, a second transistor pair with a common emitter that is a base input of a voltage difference of the PN junction pair, the common emitter having a current source, and a third transistor pair whose collectors are connected to corresponding emitters of the first transistor pair, whose bases are connected to the corresponding collectors, whose emitter are connected through a resistor, and whose emitters are connected to a current source for supplying bias currents, wherein outputs are obtained from the collector of the second transistor pair.

REFERENCES:
patent: 4216436 (1980-08-01), Lefferts
patent: 5091701 (1992-02-01), Butler
"Precision Differential Voltage-Current Convertor", Raimondo Caprio, Electronics Letters, 9(6):147-148 (1973) (No Month).

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