| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow transmission power control in which cost increase and power consumption are suppressed without separately requiring an exclusive mounting space, and a back off amount is reduced as much as possible while approximately exactly satisfying ACPR (Adjacent Channel leakage Power Ratio) characteristics. <P>SOLUTION: A transmission IC circuit part 40 converts a transmission signal of a base band into a transmission signal with a transmission frequency, adjusts transmission power of the transmission signal to output it from an antenna 10. A reception IC circuit part 20 converts the signal with a reception frequency, received by the antenna 10 into a reception signal in the base band. The reception IC circuit part 20 is controlled so that the reception frequency approximately equals to the transmission frequency by a reception IC control signal from the control part. A modem part provided at a rear stage of the reception IC circuit part 20, obtains an RSSI (Received Signal Strength Indicator) value from the reception base band signal, and transmits the RSSI value to the control part. The control part presumes the ACPR characteristics from the RSSI value, and generates transmission AG control voltage for controlling an AGC amplifier 42 of the transmission IC circuit part 40 according to the ACPR characteristics. <P>COPYRIGHT: (C)2010,JPO&INPIT |
