| 摘要 |
A transmitter for a mobile communications terminal and a transmitting method thereof capable of operating at least two transmission modes are provided to improve a communication standard of high dynamic range and improve the battery usage time of a personal portable communication device. A transmission circuit is directly driven as a polar transmitter as a direct modulation transmitter. A control circuit controls the operation of the transmitting circuit according to the size of the output signal. If the size of the output signal is greater than middle range power, a polar transmitter is driven. If the size of the output signal as to the transmitting circuit is or greater than the middle electric power, it is driven as the polar transmitter. The transmitting circuit is comprised of a baseband processor(100), a phase signal transducer(140), a size signal transducer(170), a power amplifier(180) and ADC(190). It is generated the analog baseband signal from the baseband processor. It is generated the phase between signals from the phase signal transducer in response to the baseband signal. It is generated the magnitude signal from the size signal transducer in response to the baseband signal. The class is controlled with the control of the control circuit. The output signal is fed back in ADC to the control circuit.
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