Hi,
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i have been interested in bipolar NDR devices similar to the Lambda-Diode and did some basic simulations which i can share later, if there is interest.?
I can also recommend the publications by Chua, where he identifies dozens of these circuits:
Negative resistance devices
Negative resistance devices: Part II
Bipolar - JFET - MOSFET negative resistance devices
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For now, try this link:
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Best,
Nils
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