| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal amplifier device capable of securing stable output characteristics, without causing increase in power consumption. SOLUTION: The signal amplifier device comprises a first amplifier unit with variable gain which amplifies an input signal; a second amplifier unit with a fixed gain which further amplifies the signal amplified by the first amplifier unit; an output power detector which outputs the output power of the second amplifier unit; a source voltage control unit which detects the power consumption of the second amplifier unit and calculates a source voltage correction amount obtained from the difference between the detected power consumption and reference power consumption, corresponding to a transmission power specification value input from outside to control the source voltage to be supplied to the second amplifier unit, based on the source voltage correction value; and an automatic power control unit which calculates a power correction value from an output power value detected by the output power detector and the transmission power specification value, adjusts the transmission power specification value, based on the calculated power correction amount and source voltage correction amount for controlling the gain of the first amplifier unit, according to the adjusted transmission power specification value, and supplies the signal amplified by the second amplifier unit to a load. COPYRIGHT: (C)2009,JPO&INPIT
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