Variable gain amplifying circuit

Details Variable gain amplifying circuit Variable gain amplifying circuit

2007-02-08

2009-02-10

Shingleton, Michael B (Department: 2815)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S260000, C330S291000, C330S254000, C330S296000

Reexamination Certificate

active

07489195

ABSTRACT:
A variable gain amplifying circuit comprises two stages, a first stage and a second stage with a common voltage-to-current converter. Each stage comprises two BJTs, two voltage controlled current sources, a variable resistor with a variable resistance, and the common voltage-to-current converter. The two BJTs construct a differential amplifier for amplifying a pair of differential signals. The variable resistor with the variable resistance is connected between the emitters of the two BJTs wherein the variable resistance of the variable resistor is represented as RE. The variable resistance REis controlled by a control voltage Vctrl. The two voltage controlled current sources are respectively connected between the corresponding emitter of BJTs and ground. The currents respectively through the voltage controlled current sources are equal to each other and represented as IE. The current IEis controlled by the common voltage-to-current converter according the control voltage Vctrl. The variable resistance REand the current IEof the voltage controlled current sources can be varied simultaneously by the control voltage Vctrlso as to rapidly adjust the gain of the variable gain amplifying circuit.

REFERENCES:
patent: 7034606 (2006-04-01), Caresosa et al.
patent: 7084704 (2006-08-01), Sowlati
patent: 7262659 (2007-08-01), Caresosa et al.
patent: 7295068 (2007-11-01), Capofreddi et al.

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