| 摘要 |
PROBLEM TO BE SOLVED: To provide a bias circuit capable of suitably carrying out both threshold voltage dispersion compensation and temperature fluctuation compensation. SOLUTION: The bias circuit for applying a voltage to a control terminal 106 of a first active element 104 for amplifying an RF signal includes: first and second temperature compensation circuits; and a threshold voltage dispersion compensation circuit. The first temperature compensation circuit is provided with at least one diode 118 or more. The threshold voltage dispersion compensation circuit comprises the interconnection between a second active element 113 and a resistor 111. The second temperature compensation circuit comprises at least one diode 117 or more and applies temperature compensation to a voltage applied from the threshold voltage dispersion compensation circuit to the control terminal 106 via the first temperature compensation circuit. COPYRIGHT: (C)2005,JPO&NCIPI
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