Bi-state two terminal impedance circuit?

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esd2008

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Is there a bi-state two-terminal impedance circuit that has following characteristics?

1. Current < 10nA if V < Vx
2. Impedance < 1Mohm if V>Vx

Vx is in the range of 1.8~5V. The circuit shall be self-powered and does not need power supply pins.

Thanks,


---Ryan
 

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