Transmission output amplifier

Details Transmission output amplifier Transmission output amplifier

1993-11-12

1994-12-13

Sikes, William L.

Amplifiers

With semiconductor amplifying device

Including gain control means

330285, 330129, 330284, 330302, H03G 300, H03G 900, H03G 100

Patent

active

053732510

ABSTRACT:
It is an object of the invention to control a bias current of each of the amplifying elements of an exciting section and a power amplifying section in accordance with a magnitude of an amplitude control signal. A value of a control signal which is supplied to a control signal input terminal is adjusted in accordance with a magnitude of a signal to be generated which is given by an amplitude control signal. Bias currents of transistors are adjusted by the control signal. Thus, an output voltage of the exciting section is variably controlled by a control signal. Further, gate voltages of transistors are adjusted by a voltage which is applied to a gate voltage terminal. Electric power, which can be output from the power amplifying section, is variably controlled.

REFERENCES:
patent: 4870370 (1989-09-01), Hedberg et al.
patent: 4994757 (1991-02-01), Bickley et al.
patent: 5121081 (1992-06-01), Hori
patent: 5150075 (1992-09-01), Hietala et al.
patent: 5179353 (1993-01-01), Miyake
patent: 5182527 (1993-01-01), Nakanishi et al.
patent: 5214393 (1993-05-01), Aihara

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