| 摘要 |
PROBLEM TO BE SOLVED: To obtain the amplifier from which a stable amplifier characteristic at a high frequency can be obtained against an ambient temperature change. SOLUTION: The amplifier is provided with a semiconductor amplifier element 1, a bias terminal 2 of the semiconductor amplifier element 1, a 1st resistor 3 that is used to connect the bias terminal 2 to a bias power supply, and a 2nd resistor 4 that connects a connecting point between the 1st resistor 3 and the bias terminal 2 to the ground, and a resistance of the 1st resistor 3 or the 2nd resistor 4 has a high positive temperature coefficient of resistance. Since the resistor having the high positive temperature coefficient of resistance can control a change in a bias terminal voltage of the semiconductor amplifier element when an ambient temperature is subject to change and reduce a change in an idle current of the amplifier, a distortion change at a high frequency can be reduced.
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