| 摘要 |
A grounded-emitter circuit is composed of a transistor, a first impedance circuit, and a second impedance circuit. The transistor is an NPN transistor, and the base of the transistor is an input terminal of the grounded-emitter circuit. The emitter of the transistor is grounded to GND via the second impedance circuit. The collector of the transistor is connected to a reference voltage source via the first impedance circuit, and is an output terminal of the grounded-emitter circuit. Further, the second impedance circuit is composed of a parallel resonance circuit consisting of an inductor and a capacitor. With this, it is possible to provide a grounded-emitter circuit capable of being built in an IC, and capable of removing an image frequency signal in a simple circuit configuration.
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