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Why does my MATLAB calculation/simulation differ greatly from my LTspice...
Here is my circuit in LTspice.The frequency AC is here:This is DC with .op command.--- MOSFET Transistors ---Name: m1Model: nmos-shId: 1.91e-04Vgs: 7.96e-01Vds: 9.03e-01Vbs: 0.00e+00Vth: 4.00e-01Vdsat:...
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Why doesn't the divider ratio appear in the closed loop?
In chapter 3 of the book Designing Control Loops for Linear and Switching Power Supplies: A Tutorial Guide, there is a figure 3.59:The expression of the divider ratio is as...
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Transfer function of the below circuit
How to find the transfer function of the below circuit?Please specify the steps, as i would like to learn.For anlysis, i consider V1 = 0 and all capacitor open. Thus,Req = 14.7k // 14.7k = 7.35k, as R1...
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Finding the transfer function of an op-amp filter circuit
I have the following third-order filter circuit:simulate this circuit– Schematic created using CircuitLabAnd I know that the transfer function looks...
View ArticleReal/Complex Zeros for Filter Transfer Function
So I've been reading into filter design and came across how to determine the transfer function of a filter, when given it's poles and zeroes. I've come across the following question that has me a bit...
View ArticleWhy is the frequency domain representation of an integrator 1/s?
I am taking a linear systems and signals course and we are currently looking at system transfer function realization. The textbook states the following, A transfer function \$H(s)\$ can be realized by...
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Trouble calculating transfer function of 3rd order RC lowpass filter
I am working on simulations of a 3rd order RC filter.Cascaded first order RC lowpass X3 with:R = 100 ohms,C = 3.3 nF.When I perform the calculations for the transfer function I get a result that is...
View ArticleTime constants to include in Transfer function derivation of third-order...
Concerning the problem of calculating the transfer function of a third-order filter; see Help deriving the transfer function of an LC circuit?A method kindly explained by Verbal Kint is 'FACTs', which...
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How can a power converter small signal model predict transient behaviour...
I see small signal model being used to predict the Overshoot/Undershoot of output voltage due to a load step.How do we justify this approach, since the basic assumption of small signal modelling is the...
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Clarification of the loop response of a TPS54350 buck converter (LTspice)
I've modeled the equivalent model for the TPS54350 shown on page 14, Figure 23, using component values from application circuit on page 15, Figure 24.I'm feeling quite rusty on my controls knowledge so...
View ArticleHow to plot Nyquist plots?
By using the open loop transfer function for a control system, how would you then sketch the Nyquist plot by hand?I'm aware you'd substitute any \$s\$ term for \$j\omega\$ and then rationalise the...
View ArticleTransfer Function Magnitude, how to deal with 'j'?
I have the simple transfer function of an RC filter:\$ H(s) = \frac{sRC}{1 + sRC} \$In order to find the magnitude, square the previous equation and take the square root:\$ (H(s))^2 =...
View ArticleHow can a signal be reconstructed by time features extracted from it and...
I have 50 time signals (observation)with the length of each signal being 160 samples. 5 time features have been extracted from each signal. Therefore, the feature vector matrix is 50x5. Now I want to...
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Poles of system seem counter intuitive
I have a system with the three poles 0+8i, 0-8i, and -0.5. When I input a sinusoidal signal, this is the output:Based on the poles, -0.5 is in the left side of the plane so it should be stable. +8i and...
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Op-amps circuit with diodes
I am a beginner at electronics and I am trying to solve my first problems with diodes and opamps. I have to find and draw the output voltage uο related to the input voltage ui knowing that the voltage...
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Transimpedance amplifier with parallel RC
Consider this circuit.Since a constant current source is present, the output voltage will always be $$V_o=i_sR_f$$However, you can also drive $$i_s=i_c+i_R=C\frac{dv_c}{dt}+v_c/R$$Then you can say that...
View ArticleFinding coefficients for a PID controller that minimize the integral of the...
The problemThe problem is to find the coefficients for the P, I and D terms of a PID controller used to regulate the object that minimize the the integral of the squared error (ISE):$$Q = \int_0^\infty...
View ArticlePower converter: Why is audio susceptibility named so?
In power converter, audio susceptibility refers to line-to-output transfer function. ( Line= Input voltage ) [ Ref : Fundamentals of Power electronics: Erickson ]Why is it named so-...
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Find a model with transfer function and real data
I am currently trying to create a model using a transfer function and my data. Here is my schematic:Here is my transfer function:My input signal is 2.5V for 10s, after which I decrease the voltage to...
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Second-order RLC transfer function
I solved the exercise in the picture with Laplace:Not being familiar with systems theory yet, I do not understand one thing (circled in pink in the picture.)The transfer function found with the black...
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