History
In early research it was noticed that arc discharge devices and some vacuum tube devices such as the dynatron exhibit negative differential resistance effects. Practical and economic devices only became available with solid state technology. The typical true negative impedance circuit—the negative impedance converter – is due to John G. Linvill (1953) and the popular element with negative differential resistance—the tunnel diode – is due to Leo Esaki (1958).
Read more about this topic: Negative Resistance
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