Composite power amplifier

Details Composite power amplifier Composite power amplifier

2004-09-21

2008-08-12

Pascal, Robert J. (Department: 2817)

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

C330S295000

Reexamination Certificate

active

07411449

ABSTRACT:
A PAMELA-type of composite power amplifier is configured in such a way that a single power amplifier is operated at low output voltage amplitudes by prohibiting a pair of outphasing power amplifiers to produce any current. Preferably, at output voltage amplitudes above the maximum voltage of the single power amplifier is to be reached, the pair of outphasing power amplifiers is taken into operation providing currents phase shifted by substantially 180 degrees. When also the outphasing power amplifiers reach their maximum voltages, an outphasing operation is performed.

REFERENCES:
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patent: 5025225 (1991-06-01), Tajima et al.
patent: 5786727 (1998-07-01), Sigmon
patent: 6252461 (2001-06-01), Raab
patent: 6262629 (2001-07-01), Stengel
patent: 6472934 (2002-10-01), Pehlke
patent: 7071775 (2006-07-01), Gailus et al.
patent: 7221219 (2007-05-01), Hellberg et al.
patent: 7262656 (2007-08-01), Shiikuma
patent: 7279971 (2007-10-01), Hellberg et al.
patent: 2003/0076166 (2003-04-01), Hellberg
Swedish Patent Office, International Search Report for PCT/SE2004/001357, dated Sep. 21, 2004.

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