Questions tagged [negative-resistance]
The negative-resistance tag has no usage guidance.
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
user220456
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4
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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 ...
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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):
...
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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 ...
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4
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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?
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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Compensate potentiometer wiper resistance with negative resistance [duplicate]
Is it possible to compensate a digital potentiometer's 75 ohm wiper resistance with a negative resistance amplifier?
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How was this equation derived for a L-C negative resistance oscillator?
I'm looking over some old notes and saw this series of equations for a L-C oscillator. The first step is just writing a KCL equation for the circuit:
$$
\frac{V}{-R}+SCV+\frac{V}{SL+r}=0
$$
Where \$S=...
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Attenuating op-amp circuit with offset
I am designing a non-inverting op-amp circuit that maps an input signal (V3) 0-3.3V to an output signal (Vo) 0.2-2.4V. I opted to offset the output up by 0.2V and then used a second op-amp circuit as ...
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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 ...
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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 ...
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Is it possible to reduce the resistance of a voltage source (coil)? If yes, how can I do that? [closed]
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 ...
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Is static negative resistance practically available?
I learned that negative resistance (NR) could be simulated by involving active devices like op-amps and others. I'm interested in the static/absolute NR rather than the differential NR.
My question is ...
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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 ...
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UJT Negative Resistance and Ohm's Law
A Unijunction Transistor has a negative resistance region where voltage drops with an increase in current. This was explained to me as a situation where "Ohm's Law is broken". This doesn't sit well ...
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Negative-Gm Oscillator Biasing Conditions
I have some questions regarding the circuit below. I need to ensure two conditions are met. The output is taken from the drains of the cross-coupled pair. I think the drain voltages (1.198V) are not ...
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Negative Effective Resistance
Assume that we have a circuit that is connected with components that have positive resistance. At this point the effective resistance between every two node is positive. (below is an example of such ...
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How does a magnetic ballast (large inductor) stabilize a negative resistive circuit (such as a fluorescent light)?
When reading about fluorescent lights, I noted many sources stating that a large inductor (the magnetic ballast) in series with a negative resistor (the light, in this case) will stabilize it by ...
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Neon lamps in parallel DC
I am making a nixie clock and wanting to use 2 neon lamps in parallel for each colon. However in my test circuit I can only get one to strike at a time.
The supply voltage is 170Vdc in order to power ...
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How to simulate adjustable 'negative resistance' with active components?
I'm building a decade resistance box using 2W resistors, from 10x1M ohm to 10x0.1 ohm. However, due to some contact resistance, the 0.1 to 1 ohm resistance will likely turn out to be ~1.1 ohm to 2 ...
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A questions about negative resistance?
I would like to look at negative resistance from a practical point of view, not just theory. Would you answer my questions,please?
The op-amp, R1, R2, and R3 behave as a negative resistance: Rn = - ...
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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 ...
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