| 摘要 |
In the existing technique in which the attenuation characteristic of an attenuator is adjusted by a voltage value, there are problems that a scale of a circuit of the attenuator increases because a new circuit for supplying voltage such as a step-down circuit becomes necessary, and that a thermal noise and a shot noise are mixed in an output signal of the attenuator. To solve the above-mentioned problems, provided is an attenuator comprising a T-type two terminal pair network including first and second circuits connected in series, and a third circuit connected in shunt between these first and second circuits. A shunt capacitor is connected between the first and second circuits independent from the third circuit.
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