Questions tagged [non-linear]

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9
votes
1answer
871 views

Simulating Chua's circuit in LTspice with a saturating transformer-based nonlinear resistor

Chua's circuit is one of the simplest circuits known to exhibit chaotic behavior. It consists of resistors, capacitors, an inductor, and an active nonlinear resistor. One implementation of this ...
6
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2answers
1k views

If there exists a cascade of op amps, does the previous op amp's slew rate affect the later op amp's slew rates?

All op amps used are the same Texas Instrument LM348n. The datasheet says the op amp has a nominal slew rate of 0.5 V/µs, but gives no tolerance. I have a square signal with an amplitude of 500 mV ...
6
votes
1answer
2k views

Nonlinear equation solvers in SPICE simulators

We have an assignment at the Parallel processing class, the target is to implement a Non-linear Equations solver on cuda based on Newton Raphson method and to interface this solver with an application ...
6
votes
2answers
5k views

Transformer with hysteresis in LTspice

I would like to model a transformer in LTspice with hysteresis and saturation (or just hysteresis would be nice). I have already tried the Chen model which I don't like and tried to model a regular ...
6
votes
4answers
372 views

How can I realize this nonlinear resistor?

I want to know if it's possible to realize a circuit described by the equation $$I = \sin(w V)$$ where \$I\$ is the current, \$V\$ the potential and \$w\$ a variable which characterizes the single ...
4
votes
2answers
197 views

Determine the output voltage

I'm trying to solve the following question: Determine the output-tuned circuit voltage in Fig. 4.P-7. The tuned circuit is resonant at \$\omega_0\$ and has \$Q_T = 20\$. My try: I don't know how to ...
4
votes
1answer
2k views

How Exactly Does a Push-pull Pair Cancel Even Harmonics?

I've been studying cassette tape circuits recently and the same bias oscillator circuit keeps cropping up time and again. This one from a copy of Practical Electronics (circa 1960): ...and this one ...
4
votes
2answers
184 views

When a signal has an interharmonic, is the signal periodic or non-periodic?

I have some questions regarding interharmonics. What I'm going to do is first ask just a few, and then as people answer them I would expand this post or create a new question. Harmonics are sinusoids ...
4
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2answers
543 views

What are those nonlinear loads in real microgrids/grids?

I have read in literature that nonlinear loads can impact on the operation of the so called microgrids. However, when I heard nonlinear loads I think in electronic devices such mobile phones or ...
3
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3answers
3k views

Thevenin equivalent in a nonlinear circuit

Is it possible to use the Thevenin equivalent of a voltage divider driving an emitter follower? simulate this circuit – Schematic created using CircuitLab In general, when is it safe to use ...
3
votes
2answers
4k views

Is voltage and current sources linear or nonlinear?

From the circuit theory it is known that an element whose response is linear is called linear element such as resistor, capacitor. For example, in case of resistor the slope between V and I is a ...
3
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1answer
604 views

Solving Schmitt trigger circuit using the superposition theorem

In order to solve a Schmitt trigger circuit implemented with an op-amp (or a comparator) connected in positive feedback, this wikipedia page uses the superposition theorem. My question is : why can ...
3
votes
1answer
98 views

How to even start solving multi-diode problems?

For example, in the circuit below there are 5 diodes constant-voltage-drop diodes, I could have 2^5 circuits to solve. Is there something I'm not paying attention to, that would greatly simplify this ...
3
votes
2answers
301 views

Linearizing hall effect sensors outputs

I'm trying to find a robust solution to linearize four hall effect sensors outout to obtain a signal that I can use in a PID control scheme. The output data is collect via 4 ADC channels on an ...
2
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6answers
887 views

Prove that in a *nonlinear* circuit, adding resistor between equipotential terminals draws no current

If a circuit is linear, then you can use Thevenin equivalence to prove that if a port of a circuit has an open-circuit voltage of 0 V (the two terminals are at the same potential), then the resistor ...
2
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1answer
75 views

Book to understand BJT non-linearity [closed]

Can someone please suggest a good book to understand low and high frequency non-linearities like beta, gm, cbe, cbc and rb present in bjt. Thanks
2
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3answers
114 views

Simple examples of higher order circuits and the cause of non linearity

In my previous question, I learned that resistance, capacitance, and inductance are not enough to capture the behavior of all circuits. This led me to the question, what are some examples of 'simple' ...
2
votes
2answers
442 views

effects of feedback on noise and non-linearities

This video lecture (start at 32:01), the professor showed a demo about the effects of feedback on noise and non-linearities. The graph below is a system with input signal which is applied directly ...
2
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3answers
714 views

Electrical System Harmonics

I'm a mechanical engineer so I don't know much about electric circuits and power generation to begin with. Can somebody explain what a harmonic is in the power grid and what is the reason why it is ...
2
votes
2answers
685 views

Non-linear Inductor LTSpice

I am trying to implement a non-linear inductor in LTSpice and to get it to saturate. I am using the following directive between N1 and N2 as advised in the help files: L1 N1 N2 Hc=12 Br=0.2 Bs=0.4 A=...
2
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3answers
516 views

SAR ADC has non-linearity around the middle of the range

I'm using a SAR ADC in STM32L433 chip and it exhibits a strange nonlinearity around the middle of the range which I can't explain. It's a 12bit ADC with 64x oversampling and 2 bit shift which ...
2
votes
1answer
58 views

Ian Fritz - Chaos - Cubic non linearity

I was reading Ian Fritz overview on chaotic circuits. As an example of non-linear circuit, he presents the following schematics This circuit is said to output a signal of the form x.(1-x^2) where x ...
2
votes
1answer
543 views

Variable-Gap Capacitors in LTSpice

I have seen several blog posts that discuss the concept of a nonlinear capacitor (or inductor) here, here, and here. Thanks to a concerned citizen for the references. I'm still struggling with the ...
2
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1answer
141 views

LTSpice light bulb nonlinear current

I'm in a lab and for some reason I cannot replicate my results on LTSpice. I have gathered data from an experiment where I built the circuit shown in Figure 1. I then took that data, plotted it in ...
2
votes
2answers
322 views

Temperature sensing with ADS1115

I am using an ADS1115 as an analog to digital converter to measure temperature. I am using an RTD100 temperature sensor to measure a temperature range of -40 to 150 degree celsius but the resistance ...
2
votes
2answers
598 views

Why linearise around an equilibrium point?

In the control theory dealt in class I was taught to always linearise a nonlinear system around an equilibrium point, i.e., where $$\dot x = 0$$ However, linearization is a Taylor series expansion, ...
2
votes
2answers
48 views

Voltage of IN pin of voltage regulator

A voltage regulator has a constant output voltage regardless of the load so it can been seen as a voltage dependent resistance but I am wondering what will happen in this case: simulate this circuit &...
2
votes
1answer
209 views

A question about non-linearity of an in-amp gain

I'm observing nonlinearities in microvolt range inputs on an instrumentation amplifier. Here is the amplififer datasheet and its gain is supposed to be: G = 1 + (49.4 kΩ/Rg) And the inputs to this ...
2
votes
1answer
586 views

Transistor Differential Amplifier Non-linearity

In The Art of Electronics 3rd Edition, the authors comment on how the grounded-emitter amplifier has a highly non-linear response, because the gain is related to the intrinsic emitter resistance (\$...
2
votes
1answer
766 views

What is the syntax for modelling a non-linear element in Spice?

Suppose I have the following circuit. My question is how do I write the net-list in LTSpice such that f(i) = i^2 + 2 (for example) ? I couldn't find the syntax on the internet.
2
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0answers
67 views

Nonlinear circuit and RLC

I'm trying to solve the following question from "Communication Circuits: Analysis and Design" by Donald T. Hess: For the circuit shown in Fig. \$1.P1\$, determine an expression for \$v_o(t)\...
2
votes
1answer
77 views

If interharmonics are defined for periodic signals, aren't interharmonics misleading?

Before explaining my question, I'm going to assume that 1) interharmonics, just like harmonics, are sinusoids; and 2) to analytically represent the interharmonics of a signal, we sum them to the ...
2
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0answers
86 views

tracking error state space, linear control example

I am trying to understand a detail from an example, from the control textbook Slotine and Li (1991) "Applied Nonlinear Control", Prentice-Hall, Example 6.4, pag. 220. A linear system is given: $$\...
1
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3answers
290 views

what is the load line and operating point used for in practical?

I have a hard time understanding what an operating point and load line represent and why do we need them at all. After reading some wikibedia, What I got is this load line represent response of the ...
1
vote
2answers
199 views

What is the behavior of circuit with multiple Q points?

On Q-Point of a circuit The top answer says that if you use DC current source, then the Q point is the "solution" of the circuit. I interpret this as, if you use a DC current source of I amps, then ...
1
vote
3answers
472 views

Stuck on a simple piecewise linear element problem

See the schematic of interest on a picture. \$V_S = 5 \,\rm{V}\$, \$R_S = 4700 \,\Omega\$, \$R_P = 5800 \,\Omega\$. The cucumber-shaped element is a nonlinear element. The only thing we know about it ...
1
vote
2answers
188 views

How Do Intermodulation Products Manifest in Transmitting Equipment?

What I Understand Already: Intermodulation products manifest in receiving equipment as a result of several near-by transmitters, each operating at different carrier frequencies, mixing at the ...
1
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1answer
1k views

(LM2902N based) Variable gain for a Instrumentation amplifier

I'm trying to build a Instrumentation amplifier that would do a 10uV -> 10mV amplification. The motivation is to measure uA ...
1
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2answers
115 views

Discontinuity in the charging of an inductor

I have a buck converter without the output capacitor connected so I would able to see the current of the inductor by the voltage at the load. I'm using a IR2110 to drive the mosfet. simulate this ...
1
vote
1answer
694 views

S-curve using linear potentiometer without huge power drain

The following circuit uses a linear potentiometer and two resistors as a voltage divider to create a very steep non-linear S-curve as the potentiometer is adjusted. However, the low resistances ...
1
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1answer
53 views

Non linear DC voltage conditioning

I do not want to use any adc or dac. I want to see if this is possible by pure analog circuit. Any google links or book names are welcome. From 0 to 1000mV output should be 0 to 100mV. Then from ...
1
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3answers
222 views

Bandwidth and stability of nonlinear circuit

I'm designing an antilog amplifier which produces an exponential output (0.4 mV to 4 V) for a 50 Hz sawtooth input waveform (4 mV to 4 V ramp). If this were a linear circuit, I could determine the ...
1
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1answer
2k views

Is it possible to calculate a diode's V-I curve?

the other day I was confused because I din't get how an led has different voltage drop's depending on the resistance of a resistor and the voltage supplied by the battery. But then someone answered my ...
1
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1answer
85 views

How is constant on time control better than voltage mode control for transient response?

I am trying to understand the benefits of constant on time control (COT) over voltage or current mode control. In voltage mode control, during a load transient (increase in load) an aggressive control ...
1
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1answer
892 views

Significance of Linearity in RF Power Amplifiers

I have started studying the topic of "RF" Power Amplifier (PA) operation, and so far I have come across description like, if PAs are non-linear, it does not form a straight line and rather it has a ...
1
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3answers
1k views

Why does the current waveform become non-linear in a bridge rectifier?

This is my bridge rectifier circuit, and I'm trying to understand why the current waveform of the source deforms the way it does when you approach an ideal capacitor. Source V1 is 9VAC. I simulated ...
1
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2answers
41 views

Signals and systems - Does y(n-1) affects when I check the system for linearity?

I have the following system: $$ y[n] = \frac{x[n]}{3}+ 2x[n-1] -y[n-1] $$ And I have to check its linearity, but I don't know if i'm supposed to evaluate y[n-1] as if it was a x[n-1], or if I have to ...
1
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1answer
109 views

non linear inductors characteristics

I have the following question: I have the characteristic of 2 non linear inductors and i want to find the equivalent for the following connections my problem is with the series one, i know that the ...
1
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1answer
109 views

Linearization of IR sensor GP2Y0A21YK

How do I linearize the graph analog output voltage against distance for IR sensor [GP2Y0A21YK][1]? This is the non- linear graph, I’m not sure how to make it linear? [1]: https://media.digikey.com/...
1
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3answers
174 views

Performing small signal ac analysis with non-linear components

I have written a circuit simulator that uses Kirchoff's voltage and current laws to solve linear circuits containing capacitors, resistors, inductors and op-amps (where the op-amps are assumed to be ...