Background of my Tunnel Diode Blog - Part 2 (Definition of Terms)

 Background of my Tunnel Diode Blog - Part 2 (Definition of Terms)

It is the following EE SE Q&A that aroused my interest in negative resistance and tunnel diode.  I heard about Tunnel Diode long long time ago, but I have never spent time to study the details.

So this time I would like to answer the following questions:

(1)  What is the principle and operation the the tunnel diode?

(2)  What exactly is negative resistance?

(3)  Can we use MOSFET to implement negative resistance?

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References

(1) Differential Resistance vs. R = UI - @Marc, Physics SE, Asked 2018apr17, Viewed 805 times

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Appendix A - EE SE Question on Negative Resistance

Negative resistance from MOSFET circuit - @kepsek, EESE, 2020nov20

From the following IEEE 1979 paper: 

Integrated A-Type Differential Negative Resistance MOSFET DeviceResistance

I'm trying to understand this MOSFET circuit which creates negative resistance. 

Whilst the paper explores how it works, I'm not really understanding it. 

I've tried simulating it in SPICE however I'm not really seeing the negative resistance effect, i.e negative current is proportional to voltage. 

A general overview of this circuit would be greatly appreciated as well as some indication of how to recreate it in LTSpice would be handy.

Equally any more examples of MOSFET based negative resistance would be helpful to understand it deeper. ...

Comments

@tlfong01 Nov 12 

(1) To understand "negative resistance", you must first define it, 

(2) To define something, you must first define the "terms" used, 

(3) For (1) and (2), I would suggest to Wki, 

Negative resistance - Wikipedia 

(4) To test if you do "understand" negative resistance, you should close the "book" and tell me a couple of critical terms/definitions you have just read in the Wiki. For example you might start your list with with the term "differential", and use you own words to define it (with the book closed, :), ... 

(5) Forget the IEEE 1948 paper for now, because you first need to understand the 70 year old terms and conditions used there, which are outdated/obsolete. 

(6) To understand why the three N-FET circuit is dynamically, dfferentially negatively resistive, you need to understand thoroughly the N-FET characteristic and operation, 

(7) Again, after studying the circuit, you must list some critical ideas "between the lines", or more precisely, "among the circuit symbols in the schematic". 

Let me ask you an example question: (a) Why Q1' G and S are shorted? Explain in a couple of sentences pls, ... :) 

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