Power amplifier having input ends combined in series and...

Details Power amplifier having input ends combined in series and... Power amplifier having input ends combined in series and...

2008-06-05

2009-10-06

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

C330S311000

Reexamination Certificate

active

07598810

ABSTRACT:
A power amplifier includes a first transformer, a first transistor, a first resistor, a second transformer, a second transistor, a second resistor, and a bias circuit. The first transformer drives the first transistor. The second transformer drives the second transistor. The first transformer is connected in series with the second transformer. The first transistor is connected in series with the second transistor. Therefore, the power amplifier has input impedance and output power both greater than those of a conventional power amplifier.

REFERENCES:
patent: 3134913 (1964-05-01), Pederson
patent: 3542953 (1970-11-01), Munch, Jr.
patent: 3652947 (1972-03-01), Hollingsworth
patent: 7486141 (2009-02-01), Do et al.
patent: 7511578 (2009-03-01), Dupuis et al.

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