Amplifier

Details Amplifier Amplifier

2005-05-24

2005-05-24

Shingleton, Michael B. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

C330S310000, C330S311000, C330S307000, C330S296000, C330S297000

Reexamination Certificate

active

06897732

ABSTRACT:
The amplifier includes two or more amplification stages. The rear amplification stage amplifies an output signal of a front stage transistor is comprised of two or more transistors connected in parallel. Bias point of the front stage transistor and a first rear stage transistor is class AB. Base bias of a second rear stage transistor is controlled according to an RF input by a rear stage DC bias control circuit. As a result, the second rear stage transistor is turned on when the output power is high, whereas it is turned off when the output power is low or medium.

REFERENCES:
patent: 4555672 (1985-11-01), Segal
patent: 5982236 (1999-11-01), Ishikawa et al.
patent: 6130579 (2000-10-01), Iyer et al.
patent: 06053761 (1994-02-01), None

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