Amplifier circuit and method of controlling output power thereof

Details Amplifier circuit and method of controlling output power thereof Amplifier circuit and method of controlling output power thereof

1989-01-24

1990-03-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330 51, H03G 300

Patent

active

049104780

ABSTRACT:
A multistage amplifier (1) consists of unit amplifiers (1a-1c) connected in series. A .lambda./2 strip line (20) is connected in parallel to the last stage unit amplifier (1c), so that a signal may bypass the last stage unit amplifier. When the last stage unit amplifier is disenabled, the signal bypasses the last stage unit amplifier, and the output power is reduced without a decrease of power efficiency in the other unit amplifiers. When all of the unit amplifiers are enabled and the strip line is grounded at the central point thereof, the output power is increased.

REFERENCES:
patent: 3636463 (1972-01-01), Ongkiehong
patent: 3919685 (1975-11-01), Haill
patent: 4357577 (1982-11-01), Smither
patent: 4598252 (1986-07-01), Andricos

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