A circuit for compensating a radio-frequency output level of a portable radio transceiver which full-duplex communicates by a power of battery is disclosed. The circuit includes a radio-frequency signal compensating device having a second power amplifier for power-amplifying an input radio-frequency...http://www.google.com.au/patents/US5511234?utm_source=gb-gplus-sharePatent US5511234 - Radio-frequency output level compensating circuit of portable radio transceiver
