Method and arrangement for adjusting an output impedance of...

Details Method and arrangement for adjusting an output impedance of... Method and arrangement for adjusting an output impedance of...

2007-10-09

2007-10-09

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S296000

Reexamination Certificate

active

11224702

ABSTRACT:
The invention relates to power amplifiers having an adjustable output impedance. A power amplifier according to the invention can be used, for example, for feeding a radio frequency transmission signal into an antenna of a mobile communication device. The real part of an output impedance of a power amplifier according to the invention is matched with the real part of an impedance loading the power amplifier by adjusting an operating point of an output stage transistor301of the power amplifier.

REFERENCES:
patent: 6133792 (2000-10-01), Hansson
patent: 6289205 (2001-09-01), Pollanen et al.
patent: 6597244 (2003-07-01), Tichauer
patent: 6643497 (2003-11-01), Kouyama
patent: 6670864 (2003-12-01), Hyvonen et al.
patent: 7116173 (2006-10-01), Tsutsui et al.
patent: 2004/0212434 (2004-10-01), Nagamori et al.
patent: 1298810 (2003-04-01), None

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