# Questions tagged [negative-resistance]

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### Why can't the following configuration be considered negative feedback?

In the following circuit I have kept the resistor ratio such that beta factor of negative terminal (part of output will come on inverting terminal by voltage division), is higher than that of positive ...
1 vote
189 views

### How does a signal get amplified? [closed]

Say I send an analog electric signal through a telephone wire. If that wire is long enough then the resistance will eventually make the amplitude of the signal close to zero. How do electric signals ...
• 349
2k views

### Creating a circuit with negative differential resistance

Is it possible to construct a circuit with negative differential resistance by only using components that have no negative differential resistance (e.g., resistors, diodes, BJTs, etc)? If possible, ...
• 193
232 views

### Using tunnel diode to cancel out armature resistance

Can we use tunnel diodes to cancel out armature resistance? A tunnel diode when it is in its negative differential region under DC shifted AC(AC with some DC offset) and if the Vp-p of the AC is very ...
20 views

### NIC network circuit with grounded output?

My class was given a series of circuit networks to calculate the transmission of the system. One of those networks is this type of Negative Impedance Converter with the common ground output. How can I ...
1 vote
139 views

### 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 ...
153 views

### 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 ...
• 291
37 views

### How to add a voltage control to this frequency dependent negative resistor circuit?

I would like to control the filter frequency with a control voltage. I assume that resistors R17,18,19 and 24 must be replaced with a adequate sub circuit. Could someone advice me where should I start ...
• 1,413
245 views

### Negative resistance - crystal

Why do we have the negative resistance concept in a crystal? How does the crystal exhibit negative resistance? I've read this Link and it seems to say that the amplifier is the one that causes the ...
745 views

### 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 ...
• 491
466 views

### Why does this negative impedance converter (NIC) circuit work in an LTspice simulation but not in an actual circuit?

I've been trying to invert the phase response of a non-inverting low pass filter by using a "negative resistor" (-5000 ohms,) which is achieved by the simulation below (bode plot + circuit): ...
3k views

### 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 ...
259 views

Why is an amplifier with a tuned circuit and positive feedback, such as a regenerative radio receiver, said to exhibit or have negative resistance?
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1k views

### 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 ...
• 535
709 views

### 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 ...
• 75
1k views

### 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, ...
• 75
541 views

### How is this circuit a negative resistance oscillator

I found these oscillator configurations(all are similar) at various sites on the web, but here and here the author says its a negative resistance oscillator. It's a popular oscillator among amateur ...
• 849
3k views

### 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 ...