| 摘要 |
A bias voltage supply circuit of a radio-frequency amplification circuit has a constant-voltage power supply generating a constant voltage higher than the bias voltage, a rectifier transistor and a constant-current power supply supplying a constant current to the rectifier transistor. The rectifier transistor is connected between a supply point of a bias voltage connected to an input terminal of the radio-frequency amplification transistor via an element for bias supply and a power supply voltage supply line, wherein a control terminal is kept by a constant voltage that the constant-voltage power supply generates. Since descent of electric potential of the input terminal of a radio-frequency signal does not arise because of circuit composition, the radio-frequency amplification circuit has a saturation characteristic superior than a prior art.
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