Power amplifier transmission line transformer

Details Power amplifier transmission line transformer Power amplifier transmission line transformer

2007-03-22

2008-09-02

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

C330S310000

Reexamination Certificate

active

07420424

ABSTRACT:
Disclosed herein is a power amplifier which is used in a wireless communication system and is capable of improving efficiency in an entire output power range and extending the dynamic range without additional switches, by including a drive amplification unit and a power amplification unit, connecting the drive amplification and the power amplification unit to a matching circuit, and a power coupler included in a transmission line transformer such that the drive amplification unit drives the power amplification unit, or directly outputs power to an output terminal, through the transmission line transformer, that is, the output power of the drive amplification unit is outputted to a load by switching on/off the power amplification unit and the drive amplification unit.

REFERENCES:
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patent: 6262629 (2001-07-01), Stengel et al.
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patent: 7221221 (2007-05-01), Bouny
patent: 7372335 (2008-05-01), Komijani et al.
patent: A 2000-165115 (2000-06-01), None

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