| 摘要 |
PROBLEM TO BE SOLVED: To provide a bias circuit for a high frequency amplifier capable of obtaining the high frequency power amplifier with favorable distortion characteristics while acquiring high output electric power efficiency. SOLUTION: A transistor 12 for current supply is constituted such that a collector terminal (node N1) is connected with a power supply terminal T3 via a resistance 16, and an emitter terminal (node N2) is used as an output terminal of a bias. If the output electric power of a transistor 111 for high frequency amplification declines, the potential of the node N1 rises so that it may be fed back to a node N3 by a resistance 17 to raise also the potential of the node N3. Thus, the operation of the transistor 111 for high frequency amplification is approached from class B operation to class A operation. COPYRIGHT: (C)2007,JPO&INPIT
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