Questions tagged [non-linear]
The non-linear tag has no usage guidance.
1
vote
3answers
87 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
vote
0answers
14 views
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_{\...
0
votes
0answers
67 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 ...
0
votes
0answers
64 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 ...
0
votes
1answer
46 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 ...
1
vote
0answers
32 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 ...
0
votes
1answer
100 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 ...
1
vote
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....
1
vote
1answer
59 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 ...
0
votes
0answers
34 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 ...
0
votes
1answer
113 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
votes
1answer
282 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
votes
2answers
575 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 ...
0
votes
1answer
60 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"...
1
vote
1answer
90 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, ...
0
votes
1answer
333 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 ...
0
votes
0answers
96 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
vote
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 ...
-2
votes
1answer
152 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-...
2
votes
0answers
70 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:
$$\...
0
votes
2answers
175 views
Overshoot Before Transition
First of all, a little bit of context: I'm designing a single-supply Howland current source using the OPA357 (rail-to-rail 200MHz OPAMP) to delivery 100uA of AC current up to 1MHz. In one of my ...
0
votes
2answers
84 views
Photodiode + Op-Amp Acting Nonlinearly
I've built a laser power meter based on a photodiode (likely a ThorLabs FDS10X10), a simple op-amp circuit (op-amp is TLV2462, max 12V), and a microcontroller+screen:
Internally, I've built the ...
1
vote
0answers
58 views
Nonlinear system general representation
I am fairly new with non linear systems. I understand that a general representation of a nonlinear system is:
$$
\dot{x} = f(x) + g(x)\cdot u
$$
where \$x\$ is the state variable, and \$u\$ the input....
-3
votes
1answer
67 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
votes
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 ...
4
votes
2answers
281 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 ...
1
vote
1answer
177 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
votes
3answers
235 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 ...
-1
votes
1answer
100 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;
...
0
votes
4answers
103 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
votes
1answer
59 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 ...
5
votes
1answer
949 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 ...
2
votes
3answers
462 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 ...
1
vote
2answers
79 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 ...
0
votes
1answer
182 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) +...
2
votes
1answer
138 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 ...
1
vote
1answer
120 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 ...
1
vote
2answers
453 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
votes
2answers
288 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 ...
3
votes
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 ...
0
votes
0answers
169 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
vote
1answer
653 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
votes
2answers
140 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 ...
0
votes
2answers
261 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
votes
1answer
940 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 ...
1
vote
1answer
905 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
votes
2answers
3k 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
votes
1answer
369 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
404 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.
1
vote
1answer
668 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 ...
