| 摘要 |
There is disclosed an impedance circuit which realizes negative impedance with ease, and a power supply device having negative output impedance. An impedance circuit 1 connected to an external circuit comprises: a current inverter circuit 11 having an input terminal connected to outside; a passive circuit 10 having an input terminal connected to an output terminal of the current inverter circuit 11 ; and a current inverter circuit 12 having an input terminal connected to an output terminal of the passive circuit 10 and an output terminal connected to outside. The current inverter circuits 11 and 12 work in cooperation with each other, to make magnitude of impedance of the impedance circuit 1 proportional to impedance of the passive circuit 10 , and to invert the polarity of the impedance of the impedance circuit 1.
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