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...http://www.google.com/patents/US5771470?utm_source=gb-gplus-sharePatent US5771470 - Control of a power amplifier stage of a portable transceiver
