| 摘要 |
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 inputted radio-frequency signal up to a transmitting level corresponding to an inputted automatic power control voltage level, second transmitting circuit coupled to an output terminal of the second power amplifier for radiotransmitting the amplified radio-frequency signal, second transmitting output control circuit for supplying a second automatic power control voltage to the second power amplifier in response to the input voltage of the predetermined output level, a second battery, and second power driving circuit for regulating the second battery voltage to the voltage of predetermined level and supplying the regulated voltage as an operational voltage Or the respective units in the radio-frequency signal compensating device and a connecting circuit for connecting the voltage of predetermined output level to the second transmitting output control circuit and connecting an output of the first transmitting circuit to an input of the second power amplifier, and at the same time, providing a connection detecting signal to the first transmitting output control circuit.
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