| 摘要 |
A radio-frequency amplifier having its input side well isolated from its output side comprises a radio-frequency amplifier circuit and a printed-wiring board. The RF amplifier circuit includes a first capacitor (39) coupled between an input terminal (20) and a grounding terminal (21) on the input side for compensation of frequency characteristics. The RF amplifier circuit also includes a second capacitor (40) coupled between an output terminal (22) and a grounding terminal (23) on the output side for similar purposes. The printed-wiring board has electrically conductive paths for connecting various grounding terminals, and includes an electrically conductive path (54) which exhibits inductance at high frequencies. The equivalent circuit of the amplifier when the input terminal is viewed from the output terminal forms a trap circuit in the form of a bridged-T network. <IMAGE> |
