Gain control circuit

Details Gain control circuit Gain control circuit

1985-05-10

1986-04-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330294, H03G 330

Patent

active

045830509

ABSTRACT:
Disclosed is a gain circuit which comprises a transistor for amplifying a high-frequency signal, a variable impedance element connected with an emitter of the transistor and having an impedance variable in accordance with an amount of current flowing therethrough, a control circuit for controlling the amount of current flowing through the variable impedance element, a series circuit composed of a coil and a resistor connected in series with each other, and another resistor connected between the series circuit and a power supply terminal, the variable impedance element and the series circuit being connected in parallel with each other.

REFERENCES:
patent: 3023369 (1962-02-01), Horowitz
patent: 4019160 (1977-04-01), Kam
patent: 4255716 (1981-03-01), Takada

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