| 摘要 |
PROBLEM TO BE SOLVED: To provide a bias circuit of low power consumption in which linearity can be enhanced while keeping stable and optimal bias conditions depending on the input signal. SOLUTION: A mirror circuit is constituted by a circuit composed of a grounded emitter bipolar transistor Q1 for signal amplification and a bias bipolar transistor Q2, and a circuit composed of a bipolar transistor Q3 for generating a reference voltage and a bipolar transistor Q4 for generating a reference voltage. Furthermore, a capacitor C1 is provided having one electrode connected with the base of the bias bipolar transistor Q2 and the other grounded. COPYRIGHT: (C)2008,JPO&INPIT
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