Portable telephone

Details Portable telephone Portable telephone

1995-09-22

1998-06-30

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

455115, 455117, H04B 104

Patent

active

057747970

ABSTRACT:
The present invention discloses a portable telephone which is free from overheat of power amplifier module and also capable of a stable transmission even in the condition that it is unable to amplify the power enough. The portable telephone incorporates a power amplifier module which contains power FET's for amplifying transmission signals. A supply voltage monitoring means detects a supply voltage of a power supply. A control-voltage setting table stores a plurality of commands to set a control-voltage of the power amplifier module. A control-voltage selecting means selects a relevant command out of the control-voltage setting table with reference to the detected supply voltage. A control-voltage control means controls the control-voltage of the power amplifier module according to the command selected by the control-voltage selecting means. The control-voltage will be thereby reduced when the supply voltage is high. This results in reduction of a current flow in the power amplifier module, and an overheat of the power amplifier module can be avoided.

REFERENCES:
patent: 4989260 (1991-01-01), Meade
patent: 5081713 (1992-01-01), Miyazaki
patent: 5192919 (1993-03-01), Wieczorek
patent: 5239694 (1993-08-01), Toyoshima

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