Control of a power amplifier stage of a portable transceiver

Details Control of a power amplifier stage of a portable transceiver Control of a power amplifier stage of a portable transceiver

1995-08-31

1998-06-23

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455127, 330277, 330296, H04B 116

Patent

active

057714703

ABSTRACT:
A portable radio transceiver has a gallium arsenide depletion mode n-channel field-effect transistor as the transmitter power supply amplifier which needs a negative supply applied to its gate to establish the correct working point. A positive power supply provides the power input to the gallium arsenide transistor and a high side switch in the form of a PMOS enhancement mode transistor is used to switch the transmitter on and off. The negative supply is also used to forward bias the gate of the PMOS transistor when conducting so as to reduce its forward conduction resistance thereby enabling a smaller transistor to be used which can be integrated with other low power devices used by the transceiver.

REFERENCES:
patent: 5235289 (1993-08-01), Kunimoto
patent: 5327583 (1994-07-01), Yamada et al.
patent: 5465400 (1995-11-01), Norimatsu
patent: 5548247 (1996-08-01), Ogino et al.
patent: 5559471 (1996-09-01), Black

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