Gain control circuit

Details Gain control circuit Gain control circuit

1993-01-19

1994-07-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330311, H03G 330, H03F 345

Patent

active

053270975

ABSTRACT:
There is provided a gain control circuit which comprises a circuit unit composed of a transistor Q.sub.11, a first gain control unit 12 including transistors Q.sub.12 and Q.sub.13 having emitters connected to each other and a choke coil L.sub.1 having an end connected to the collector of the transistor Q.sub.12 and the other end connected to the collector of the transistor Q.sub.13 for checking a high frequency signal current, and a second gain control unit 15 including transistors Q.sub.14 and Q.sub.15 having emitters connected to each other. Then, the transistor Q.sub.11 of the circuit unit is connected to the node where the emitters of the first gain control unit 12 are connected to each other and the node where the transistor Q.sub.13 of the first gain control unit 12 is connected to the choke coil L.sub.1 is connected to the node where the emitters of the second gain control unit 15 are connected to each other, and a high frequency is input to the base of the transistor Q.sub.11 of the circuit unit. With this arrangement, a power consumption is reduced and the distortion of an output signal is improved.

REFERENCES:
patent: 4480337 (1984-10-01), Graziadei et al.

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