Power amplifier system provided with improved protection...

Details Power amplifier system provided with improved protection... Power amplifier system provided with improved protection...

2008-05-20

2008-05-20

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

C330S296000, C330S20700P, C330S051000

Reexamination Certificate

active

07375589

ABSTRACT:
The present invention provides a power amplifier system that includes a power terminal, a ground terminal, an output terminal, a ripple terminal, a control terminal, a power amplifier circuit connected between the power terminal and the ground terminal, a negative potential detection circuit connected to the output terminal, a bias start-up circuit that is controlled by an input of the control terminal, an output of the negative potential detection circuit, and the potential of the ripple terminal, and controls a bias start-up signal, a power amplifier IC that has a bias circuit which is controlled to be started up by the bias start-up signal, and has its output node for outputting a power amplifier bias voltage connected to the ripple terminal, and a ripple filter capacitor externally connected to the ripple terminal of the power amplifier IC.

REFERENCES:
patent: 4402029 (1983-08-01), Fujita
patent: 5543760 (1996-08-01), Honda et al.
patent: 5847610 (1998-12-01), Fujita
patent: 6097254 (2000-08-01), Yamamoto
patent: 6469575 (2002-10-01), Oki et al.
patent: 2005/0231287 (2005-10-01), Wong et al.
patent: 2001-7659 (2001-01-01), None
patent: 2004-112019 (2004-04-01), None

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