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Questions tagged [non-linear]

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Solving power flow equations: subsets of variables, parameters, and equations

At each bus \$i\$ in a power grid, there are four quantities of interest \$V^i\$, \$\theta^i\$, \$P^i := P_g^i - P_d^i\$ and \$Q_g^i - Q_d^i\$. The power flow equations provide two equations \$P_{\...
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66 views

What is the importance of Lyapunov stability for non linear control?

I understand that studying stability gives a particular region from which if we start it will converge to an equilibrium point. But why is the study important specifically for designing non linear ...
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56 views

Transfer function_Approximation of second order system for a linear actuator

I am trying to approximate a transfer function of a system. The system is a linear actuator, connected to a feedback potentiometer. The actuator has a mass on it. The following figure is a step ...
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1answer
40 views

How to plot response of a non-linear state space model in Simulink?

I am trying to plot a non-linear model in order to compare it with it's linearized counterpart. I am following this paper Nonlinear Model & Controller Design for Magnetic Levitation System and ...
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0answers
30 views

2 tone test with RF mixer

I am designing a system that uses RF to probe the nonlinearity of a target. It works as follows. Transmitter sends out 2 RF frequencies, such as 900 and 910MHz. The target/reflector has a ...
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1answer
88 views

DC motor driver response [closed]

I have some trouble about the response of the L298N DC motor driver. After some experiments, I have noticed that the output response of the L298N isn't linear. In particular, if i give a ramp input ...
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0answers
39 views

Analyzing a non linear circuit with two sources [duplicate]

I want to analyze this circuit. V1 is a) +15V b) +10V c) -5V I need V2, V3, I1, I2, I3 Uz=6,8V UF=0,7V And I hate to say this, but I'm absolutely lacking any approach. I don't know how to manage V1....
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1answer
55 views

Problems with analyzing a simple, non linear circuit

I have some problems with analyzing this pretty simple circuit (or more precisely with understanding the solution): The task is to find the characteristic curve for $$|U_E| \le 5V$$ My first ...
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33 views

Is the V_t in this document regular Thermal voltage?

I have been looking at this short document. https://pdfs.semanticscholar.org/c490/4c04a7be1d675e360409178da71a1253f6d8.pdf It uses V_t and defines it as thermal voltage of a transistor. It does not ...
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1answer
108 views

Solution for a set of non-linear equations

I am trying to solve the following equations for \$\delta\$ and \$K\$. I have tried Matlab function fsolve, but unsuccessfully. I also tried Wolfram Alpha and, ...
6
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1answer
254 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 ...
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2answers
526 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 ...
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1answer
59 views

Is the gain from IIP3 curves wrong?

Suppose I have an unknown system and I would like to know its linearity. I am confused by the proper measurement of the IIP3. The gain is defined as "total output power" divided by "total input power"...
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1answer
87 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, ...
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1answer
281 views

Linear and non linear phase FIR filter

I am a confused about linear and non linear fir filter. I have this depiction of the solution space for linear-phase and nonlinear-phase FIR filters for a given set of specifications. Region 1 ...
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0answers
87 views

Timestep error for Logistic Map in LTSPICE

I am building a logistic map circuit in LTSPICE. So far, I've prepared this: The factor of 25 after the second AD633 is for increasing the scope of the parameter values. However, this circuit always ...
1
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1answer
76 views

What are the mechanism and effects of non-linearity in an attenuating barrier in the presence of a high-strength EM field?

It's my understanding that in electromagnetics, if an attenuating device is functioning linearly, it means that 1) input and output signal strengths are proportional; and 2) input f = output f. How ...
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1answer
142 views

Linear and non-linear attenuator

[edit 3/2/18] There are problems with the title and wording of this question. I would edit, but to do so would alter the relationship between the question and the answer that I accepted. So, I have re-...
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0answers
64 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: $$\...
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2answers
164 views

Overshoot Before Transition

First of all, a little bit of context: I'm designing a single-supply Howland current source using the OPA357 (rail-to-rail 200MHz OPAMP) to delivery 100uA of AC current up to 1MHz. In one of my ...
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2answers
80 views

Photodiode + Op-Amp Acting Nonlinearly

I've built a laser power meter based on a photodiode (likely a ThorLabs FDS10X10), a simple op-amp circuit (op-amp is TLV2462, max 12V), and a microcontroller+screen: Internally, I've built the ...
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0answers
57 views

Nonlinear system general representation

I am fairly new with non linear systems. I understand that a general representation of a nonlinear system is: $$ \dot{x} = f(x) + g(x)\cdot u $$ where \$x\$ is the state variable, and \$u\$ the input....
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1answer
64 views

Good book on system identification for non-linear systems? [closed]

Can anyone suggest a good book that describes how to experimentally identify and describe non-linear behavior in real world systems? I have had good success analyzing systems using linear methods such ...
0
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1answer
33 views

Highly integrated RF front-end chipset RFX8055 issues

In this datasheet of RFX8055 (CMOS 5GHz WLAN 802.11a/n/ac RFeIC WITH PA, LNA, AND SPDT switch), they mention "5GHz Power Amplifier with Low-Pass Harmonic Filter". If this filter is meant for ...
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2answers
262 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 ...
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1answer
170 views

Part name in Pspice

I was working on some simulations in logistic map in MATLAB, and need to verify some results in a virtual circuit of a logistic map. I found this circuit diagram for the logistic map. However, I am ...
2
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3answers
213 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 ...
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1answer
99 views

Numerical calculation of non-linear LRC circuit

I’m trying to solve a circuit using Excel and numerical calculations. Unfortunately, I’m a slightly stuck at the starting line and was hoping for some assistance here. The circuit is presented below; ...
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4answers
99 views

Nonlinearities in Fully Differential Op Amp

I am trying to construct an amplifier circuit using a fully differential op amp (THS4503) to interface with an ADC (ADS5232). I will be reading a 0-5V sensor, which needs to be converted to a 1Vpp ...
0
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1answer
54 views

Harmonic balance Michael Steer derivation?

I was going through harmonic balance method and one of the references I used was Microwave and RF design Systems Approach by Michael Steer . In one of the examples provided , he derives the current ...
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1answer
889 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 ...
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3answers
440 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 ...
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2answers
75 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 ...
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1answer
168 views

State Space model for a MIMO, coupled system

I came across a non-linear MIMO system with coupled inputs which is to be modelled in state space form. The kinematics are as follows: $$ \ddot{x} = F_Ecos(\psi)sin(\theta) + F_Esin(\psi)cos(\theta) +...
3
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1answer
135 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 ...
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1answer
109 views

varistor with reverse operaton

Varistors are known to use for over-voltage protection, as they have high electrical resistance at low voltage which decreases as the voltage is raised.(wikipedia). But is there any electrical ...
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2answers
428 views

IP2 1dB compression point representation and formula

I'm trying to calculate the 1dB compression point in a second order interception. I did find many examples using third order, however, for a second order, I couldn't find much. In Matlab I could ...
2
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2answers
268 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 ...
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2answers
2k 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 ...
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0answers
162 views

Nonlinear circuit v(i) function for I-V plot

I'm trying to understand how to theoretically derive the equation that could be used for plotting the I-V graph. The points of interest are Out + and ...
1
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1answer
586 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 ...
0
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2answers
135 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 ...
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2answers
249 views

Why non linear amplifiers are more battery efficient than linear ones? [closed]

I was going through a document on GMSK modulation where it is specified that it is immune to distortion from non linear amplifiers.Also it was mentioned that non linear amplifiers are more battery ...
4
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1answer
903 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 ...
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1answer
862 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 ...
6
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2answers
2k 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 ...
2
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1answer
357 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 (\$...
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1answer
377 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.
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1answer
635 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 ...
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1answer
87 views

Zener VI Characteristics, noise reduction

Consider RIN = 1K, VI=9.5, vi=50m, given Zener characteristics by the graph. I have to find VO(DC output) and vo(small signal output. Case 1: RL = 2k for DC voltage : ...