| 摘要 |
PROBLEM TO BE SOLVED: To improve efficiency and reduce a noise by a stable performance in a high-frequency power amplifier. SOLUTION: A bias voltage DC is applied through a resistor R1 to the base of a transistor Q1, and a high frequency signal RF is inputted through a capacitor C1. The bias voltage DC is applied through a resistor R2 to the base of a transistor Q2. The bias voltage DC is applied through a resistor R3 to the base of a transistor Q3, and a high frequency signal RF is inputted through a capacitor C3. A band stop filter F12 is provided between the base of the transistor Q1 and the base of the transistor Q2. A band stop filter F23 is provided between the base of the transistor Q2 and the base of the transistor Q3. Moreover, the respective collectors of the transistors Q1-Q3 are commonly connected, and the respective emitters thereof are all grounded. COPYRIGHT: (C)2007,JPO&INPIT
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