TRANSMISSION DEVICE AND RADIO COMMUNICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a transmission device having a preferable power efficiency and a wide control range of transmission output power.

SOLUTION: At the pre-stage of a high-frequency power amplifier 105 for changing the amplitude of a high-frequency phase modulation signal S4 according to a base band amplitude modulation signal S2 and a gain control signal S12, there is provided a variable gain amplifier 201 for changing the amplitude of the high-frequency phase modulation signal S4 according to the base band amplitude modulation signal S2 and the gain control signal S12, so that the base band amplitude modulation signal S2 is supplied to a variable gain amplifier 203 via a linear-log conversion unit 206.

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