10
votes
Sine generator - Bubba Oscillator
It does oscillate, you can see that it does on the right side of the plot. If you zoom in on the left side you should also see the oscillation but at a much smaller amplitude.
Your misconception ...
- 80.2k
10
votes
How to design EMI filter if you don't have the actual physical circuit ready?
I can only speak to my experience in space applications, but I wouldn’t be surprised if this applies to other industries as well.
Is this how actual EMI filters are always designed ? After the actual ...
- 2,189
7
votes
Accepted
How to use Voltage Measurement in Matlab Simulink?
Your model is not built in simpowersystem environment so you can not use the voltage measurement block. The correct way to measure the voltage, is by using "voltage sensor" from Simscape>foundation ...
- 1,084
6
votes
How to design EMI filter if you don't have the actual physical circuit ready?
In answer to you questions as they appear in your post. I am assuming you are asking about conducted emissions (CE) on the input power lines.
No, they are not always designed after the actual circuit ...
- 9,717
5
votes
Sine generator - Bubba Oscillator
Just to add yet another post on this. Here's a circuit that should actually work, using a quad LT1631 and a single power supply rail:
simulate this circuit – Schematic created using CircuitLab
...
- 77.2k
5
votes
How to design EMI filter if you don't have the actual physical circuit ready?
The best EMI filter is the one that you don't need. So you'd typically start by running the circuit in SPICE, and add parasitic properties of key elements. E.g. decoupling capacitors have ESR and ESL (...
4
votes
How does a Delta-Sigma DAC work?
The DAC is simply the feedback portion of the ADC. The basic concept is illustrated here:
simulate this circuit – Schematic created using CircuitLab
The contents of the dashed boxes is ...
- 169k
4
votes
Accepted
4
votes
Is it appropriate to model a DC/DC converter as a variable resistance if I have input voltage and current datapoints?
The easiest way to model a regulating dc-dc converter is to use a constant power source. It can be modeled as a voltage-controlled current source. The instantaneous current depends on the power ...
- 20.5k
3
votes
Accepted
Building a Shunt active power filter in the synchronous reference frame
Well as usual, I'm answering my own question,
The block i was looking for is a LPF : Low Pass Filter.
The idea is that we have both the Harmonics and the fundamental together and we need to separate ...
- 125
3
votes
What is causing this long tail in the transient reponse?
The slow oscillating behavior in the system results from a pole with real part close to zero and, by looking at your step response, with a frequency close to \$0.1 \; \text{Hz}\$ \$\; (0.62 \; \text{...
- 2,527
3
votes
Accepted
Truth table with logical gates for a traffic light
YELLOW = \$B\$.
RED = \$\bar A\$.
GREEN = \$\overline {RED + YELLOW}\$
Purple is the implied logic for the red light, orange is the implied logic for the yellow light and green is for the green ...
- 437k
3
votes
Accepted
Boost converter achieving over-unity efficiency
I'm measuring the input and output power in this manner:... The
multimeters are used to measure the input and output voltage and
current, the product block is used to multiply voltage and current and
...
- 55.6k
3
votes
How to design EMI filter if you don't have the actual physical circuit ready?
You can just do in models, what you would have done in real life.
Make a model of the LISN (with test points) and attach it to your Simulink model. You would then be able to see what the test points ...
- 11.9k
3
votes
Accepted
Need help with simulation of three-phase active rectifier on LTSPICE
Break down the problem: separately, plot each controlling source, and compare it with Simulink. When all 6 match, then you know the controls are good. Then make sure the controlling pulses are at ...
- 21.2k
3
votes
Accepted
Is it possible to simulate entire circuit designs before physically building the circuit?
Yes, its possible. The FAN7392 spice model is available. I'd use LT spice, it is simple and saves time. You can import other spice models into LT spice You don't really simulate the micro controller, ...
- 76.4k
3
votes
Simulink question: How was this response obtained if the input is zero?
As the text right above the two figures says, "x has an initial condition". This means that the integrator is initially "charged" to a value x0 at time t=0. It is subsequently ...
- 14.9k
2
votes
Object tracking project
(Answering this despite broad scope because this is clearly a student capstone project... I'm treating this as a question about how a university student should approach capstone project management.)
...
- 14.5k
2
votes
Accepted
Problem in FSK demodulation
Well, if you can stabilize the PLL a bit more this is going to provide better pay-back when it comes to recovering the data but, in the absense of any improvement, you could try passing the signal ...
- 437k
2
votes
Inferring RAM ALTERA from vhdl of HDL CODER
The Quartus synthesizer has some serious issues. It's extremely particular about inferring RAMs as well as performing certain constant elaboration (i.e. initializing a RAM with a trig function such ...
- 40.7k
2
votes
Accepted
How can I plot the voltage across any component by Matlab?
What you can do in MATLAB is the following:
Make a Bode plot like this:
...
- 8,155
2
votes
Transfer function of a rotary encoder
A rotary encoder produces a discrete output, not a continuous one so would perhaps the Z-transform be more appropriate. This book chapter gives a more thorough analysis (section 4.2.4 of Digital ...
- 470
2
votes
How to set threshold above or below which the signal turns zero
Begin with a window comparator: -
The one above works with a positive supply rail but is easily reconfigured for a split rail supply that allows the full negative and positive input range desired.
...
- 437k
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