Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

2005-04-12

2005-04-12

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000

Reexamination Certificate

active

06879210

ABSTRACT:
A variable gain amplifier includes one transistor and the other transistor which configures a differential transistor pair. An output signal voltage is taken out from a collector terminal of the one transistor. A first gain control signal to control a gain is supplied to the other transistor. The amplifier also includes a first voltage/current converter connected to a common emitter terminal of the one transistor and the other transistor, the first voltage/current converter having an input signal voltage supplied thereto, a power circuit which applies a constant bias voltage to a base terminal of the one transistor, and a capacitor connected to at least a base terminal of the other transistor.

REFERENCES:
patent: 6046640 (2000-04-01), Brunner
patent: 6215989 (2001-04-01), Otaka
patent: 6614303 (2003-09-01), Nentwig
patent: 54-147761 (1979-11-01), None
patent: 2000-196386 (2000-07-01), None

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