| 摘要 |
An amplifying circuit having a bias voltage setting mechanism includes: a first amplifying element that amplifies an input signal and outputs the amplified signal as an output signal; a bias voltage setting unit that generates a bias voltage from the output signal on the basis of a control signal, such as an AGC voltage; and a high impedance element (third resistor) by which the bias voltage is applied to an input portion of the first amplifying element and which, when a component for bias voltage setting, such as a fourth resistor, is externally provided in the bias voltage setting unit, prevents a capacitive component of the component for bias voltage setting from being equivalently connected with respect to the input portion.
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