Questions tagged [non-linear]

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Using a non-time domain equation for a nonlinear equation based device in QUCS

I'm trying to model a magnetron oscillator source in QUCS. I am only interested in the output of the magnetron, not how it is powered. Traditionally a magnetron is modeled the same as many oscillators,...
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1answer
73 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 ...
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3answers
113 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' ...
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1answer
57 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 ...
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37 views

What's wrong with my experiment to observe harmonics caused by receiver saturation and non-linear behavior?

I've been trying to devise an experiment to produce a third order harmonic in radio receiver that's been saturated, but I'm not seeing the expected results. My understanding of the theory is that when ...
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0answers
112 views

How do I simulate an RF mixer in PSS or harmomic balance with an autonomous local oscillator?

I am designing a CMOS RF downconversion signal chain comprised of a local oscillator and mixer (the LNA is not yet included) using the Cadence Virtuoso Circuit Design Suite with ADE XL as my simulator....
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0answers
204 views

Transient buildup of capacitively coupled transistor amplifier

I'm trying to understand the following section from "Communication Circuits: Analysis and Design" by Donald T. Hess: Here \$W(t)\$ is defined by $$W(t) = e^{\frac{q(v_i(t) - v_{imax})}{kT}}...
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1answer
91 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 ...
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2answers
189 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 ...
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0answers
66 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)\...
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0answers
39 views

Correcting non-linear response of 5050 RGBW LED strips

I'm a non-engineer asking this question. I'm using a so-called 5050 RGBW LED stips for a project. The level of each colour is controlled by a mosfet transistor (IRLZ34N) which is in turn modulated by ...
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6answers
883 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 ...
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0answers
24 views

timestep too small error with non-linear capacitor - how to handle possible discontinuous points

I am using LT spice to simulate a thermal problem involving a phase-change material (a paraffin). [ with the paraffin modeled as a non-linear capacitor and resistor (the capacitor represents the heat ...
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45 views

Single balanced mixer, multi-tone analysis

I realized the circuit shown below on ADS. Schematic of the mixer can be shown below. As can be clearly seen from the figure below, to perform a multi-tone analysis RF signal is feeded with two ...
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0answers
15 views

Is Image Based Visual Servoing a non-linear controller?

Is Image Based Visual Servoing a non-linear controller? I think it is as the Image Jacobian has square terms of u & v (image-plane coords). Where \$p_u, p_v\$ are the width & height of each ...
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1answer
62 views

Modelling a non-linear resistor on ADS

How can I model a non-linear resistor whose current changes according to the equation shown below on Advanced Design System (ADS) or AWR Microwave Office? $$i(t)=v-v^2-v^3$$ Where v is voltage ...
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1answer
97 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 ...
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1answer
103 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 ...
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2answers
87 views

What is the physical meaning of reactive power in non-sinusoidal steady-state (with harmonics)?

In sinusoidal steady-state (linear loads, no harmonics), I understand what is reactive power \$Q = V_{\text{rms}} I_{\text{rms}} \sin{(\theta)}\$ where \$\theta = \theta_v - \theta_i\$: its absolute ...
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1answer
47 views

Difference between THD equation and design circuit current

Why does the summation of design circuit current equation (Ib) start with 1 while for calculating THD the summation starts with 2?
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1answer
114 views

Colpitts oscillator bypass capacitors importance

A Colpitts oscillator makes use of the common emitter configuration, and the indicated amplifier configuration is known to be a linear circuit. How come do we call the stated oscillator a nonlinear ...
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1answer
71 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 ...
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50 views

Linearization of nonlinear plant with system identification in Matlab

I hope this question fits in here and there is someone who can maybe help me. I am new to control theory and I have a very complex Simulink model which is nonlinear. I want to have a linear ...
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2answers
165 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 ...
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2answers
263 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 ...
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1answer
70 views

Does a wide-band, high-current, inline ammeter circuit already exist?

I have an application where I would like to measure currents up to 1000 A, inline, but am also interested in using the same circuit for a low current part of the cycle. The thought is that if I can ...
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1answer
438 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 ...
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1answer
157 views

Oscillator circuit using comparator and opamps

All opamps are ideal and Rx = 2R in the figure. The comparator is a nonlinear block which operates as follows: if its input Va < 0, its output is +1V. If Va > 0, its output is -1V. To simplify ...
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2answers
70 views

distance between linear and non-linear function of op-amp system

I have a circuit which I have taken a picture of as you can see, in which i have values of $$R1=1k\Omega,R2=10k\Omega,R3=10k\Omega.R4=10k\Omega,R5=20k\Omega$$ and sine input signal with off-set value=...
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2answers
154 views

Why is the Hybrid-PI model like that?

The BJT and MOSFET can be modeled using the Hybrid-pi model. I only know that the transistor can be modeled with linear elements like that, but I don't know why. There are a lot of things that confuse ...
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229 views

DAC "aliasing" of harmonics

While reading articles and application notes regarding DACs and their output spectrum, I stumbled across aliasing of higher harmonics to the first Nyquist band. For example, when generating a single ...
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1answer
58 views

Linearization of nonlinear system

I have a nonlinear system described by: $$\begin{align} V\,\dot x_1 &= Q_1 C_1 - (Q_1+u)x_1 \\ V\,\dot x_2 &= C_2\,u -(Q_1+u)x_2 \\ y &= -\frac{\log{\left[(x_1-x_2)+|x_1-x_2|+4K\right]}...
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3answers
225 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 ...
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3answers
93 views

Linear or nonlinear

Please is this graph for voltage against distance linear or nonlinear
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1answer
90 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/...
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3answers
451 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 ...
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1answer
140 views

How can the maximum average power transfer be negative in a power delivery circuit?

It is possible that the Thevenin resistance \$R_{Th}\$ of a circuit is negative. This occurs in non-linear circuits. Likewise, in AC circuits, the real part of \$Z_{Th}\$ can be negative. For AC ...
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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 ...
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2answers
290 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 ...
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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 ...
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2answers
630 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=...
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459 views

How to make a non-linear potmeter more linear

I have an "Expression pedal" that worked fine on my old keyboard (Gem WX2+) but works almost like a digital switch on my new keyboard (Roland VR-09). The recommended expression pedal is a Roland EV-5 ...
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1answer
48 views

Normalizing a nonlinear plant in system identification in control

I have calculated the "active power" and the "the reactive" power of a system in dq axis in nonlinear form and I am doing system identification on this "nonlinear" plant as a MIMO system. The problem ...
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3answers
172 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 ...
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3answers
206 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 ...
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1answer
306 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
252 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
106 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
388 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
41 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....