Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [negative-resistance]

28 questions
13
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1 answer

Stability of input filter in SMPS - Theoretical explanation

I read the Application note Wurth Electronics ANP008c about negative resistance of a SMPS input and how to avoid oscillation when using an input LC filter. I'm asking for a theorethical clarification on the following: In the document, it is stated…
Alessio Caligiuri
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6 answers

Negative resistance, impact on voltage source?

According to this, if \$R_1=R_2=R\$ then input resistance is \$R_{in}=-R_3\$, and if we assume that op amp is ideal. So negative resistance is in parallel with voltage source \$V_s\$. Am I understand this well, in this case ideal voltage source is…
Zippi
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4
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4 answers

0 current in a circuit using tunnel diode

Suppose we have a diode with negative differential resistance of -40 ohm in the region of 0.3-0.5 V and we put it in parallel with a 40 ohm resistor: simulate this circuit – Schematic created using CircuitLab Now Rt = R1*R2/R1+R2 = -1600/0 =…
Jun Seo-He
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4
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4 answers

Magical uses of tunnel diodes

I am studying the working principle of tunnel diode and I am reading for a voltage range it creates a negative differential resistance. If we have a current source supplying the circuit with some current, if the current is inside the negative…
Miss Mulan
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4
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4 answers

How to make/describe an element with negative resistance of minus 1 Ohm?

How do I make/describe an element with negative resistance of minus 1 Ohm? It's I–V characteristic should then be \$I = -U\$ Is this possible? I need exactly what I wrote. No compromises. The negative resistance should not be used…
Dims
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4
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2 answers

Negative resistance from MOSFET circuit

From the paper https://ir.nctu.edu.tw/bitstream/11536/5095/1/A1979JE36000027.pdf 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…
kepsek
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4
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5 answers

Is negative resistance possible?

I was reading Hayt Kemmerly Engineering Circuit Analysis Book,(I tried others, but this is the most comprehensible to me.), And I came across this circuit. I understand the first two, but I don't understand how, in the 3rd circuit (c), there is…
Angular Orbit
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1 answer

Compensate potentiometer wiper resistance with negative resistance (LM358)

I'm trying to cancel wiper resistance of a 10 kΩ DiGiPot that controls output voltage of a switching power supply. I'm using MCP4131-103 that has 120 Ω wiper resistance @0% pot position. This wiper resistance limits the max voltage that I can get…
AKTanara
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3
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2 answers

Circuit LTspice implementation not working

I stumbled upon on Chua circuit and tried to implement it LTspice. This was allegedly supposed to be a double scroll, however upon simulating it in LTspice I achieve a different result. Here you can see the current across C2 against the voltage…
kepsek
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3
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Negative resistance circuit

The circuit is inputted with a 200Hz sine wave and the amplitude is varied. I believe the circuit is operating with negative feedback. But also the 8.2K resistor is then switched to an 18K resistor in which it is then operating in positive feedback.…
mwilliams25
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4 answers

Negative resistance in a regenerative radio receiver?

Why is an amplifier with a tuned circuit and positive feedback, such as a regenerative radio receiver, said to exhibit or have negative resistance?
hotpaw2
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Compensate potentiometer wiper resistance with negative resistance

Is it possible to compensate a digital potentiometer's 75 ohm wiper resistance with a negative resistance amplifier?
user3476707
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Oscillator circuit with a Negistor

I am trying to do some experiments with the following oscillator circuit extracted from http://jlnlabs.online.fr/cnr/negosc.htm based on Esaki oscillator. I am using 2N2222 and a 10mH inductor instead due to the availability of components, but not…
Pojj
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Powering a negative resistance converter with an Arduino power pin

I want to build a negative resistance converter and the only voltage source I have is a 5 V Arduino power pin. I am afraid the reverse current (Is) flowing through the power pin will destroy my Arduino and render it useless for future projects. Are…
Reinhardt Walzer
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Is it possible to reduce the resistance of a voltage source (coil)? If yes, how can I do that?

First, I should inform you that I am a mechanical engineer, so this is an adventure to me. What can sound as basic to you, is like a new discovery for me. Second, I would like to introduce you the context I am going to use this: I have set up an…
Willian MK
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