# Tag Info

### Decent MOSFET for a beginner to learn from?

Four parameters to look for: $R_{DSon}<0.1\Omega$ for $V_{GS}>3V$ The Miller plateau voltage $V_M < 3 V$. Find this on the gate-voltage vs gate-charge graph. $V_{DSbreakdown}>30V$ ...
• 16.9k

### Decent MOSFET for a beginner to learn from?

Mosfets are more diverse than transistors. Transistors have been around for much longer and common transistor part numbers are manufactured by multiple vendors with very similar names. A common Mosfet ...

### Decent MOSFET for a beginner to learn from?

Enclosed you find a link to a list with MOSFETs from the German forum mikrocontroller.net. The list contains the most essential parameters of each MOSFET including the housing type. Prices may not be ...
• 101
Accepted

### How can I simulate an RF signal as received by an antenna in LTspice?

Yes, to all, with the caveat that (4) will take a very long time as transient simulation proceeds incrementally, as discussed in another recent question. And consequently might not be very accurate (...
• 39.4k

### Beat frequency - Square signal

Made with microcap v12 The text in the picture shows the "equivalence" of the 2 formulas.
• 14.4k
1 vote

### LTspice - Beat frequency

Made with microcap v12 The text in the picture shows the "equivalence" of the 2 formulas.
• 14.4k

### Why did I get different simulation results for the same transistor model in LTspice?

Note that the SUBCKT (between the .SUBCKT and .ENDS cards) contains the statements, ...
• 39.4k

### LTspice - Beat frequency

The right side of the equation is a product of cosines, not a sum. If you multiply the right side out, you'll find that your waveform is comprised of two signals: cos(2$\pi f_1 t$) and, or plus, cos(...
• 4,002
Accepted

### LTspice - Beat frequency

The frequencies are 100 kHz and 120 kHz on the FFT. There is no frequencies at (f1+f2)/2 and no frequencies at (f1-f2)/2. And there should be none. The wikipedia article doesn't claim that there ...
• 96.7k

### Is there any way to speed up simulation in Ltspice?

For a 'stiff' circuit (meaning there are multiple widely differing timescales which are important), a transient (.TRAN) analysis will always take a long time. Basically the circuit (simulator) has to ...
• 19.4k
Accepted

### Beat frequency - Square signal

I'd say the result you got for the two sine waves is logical: you can only create new frequencies using nonlinear operations, and addition is a linear operation. So, a beat frequency can't arise from ...
• 96.7k
Accepted

### Does the FFT in LTspice not work properly?

Made with microcap v12 FFT is calculated on a "number" of points. If you change this number, then it should be ok. I make the test with using 1024 points ... and 1 048 576 points where it is ...
• 14.4k

### How to define the initial charge of a capacitor in SPICE

For a capacitor you can simply do, in the field of the cap value something like this: 1u, IC=3 and this appears to work. But not for an inductor, for some reason...
• 1
Accepted

### I am Seeking Help to Adjust DC Motor Simulation Parameters in LTspice for Accurate Current Modeling

I initially considered deleting my question, but I think sharing an answer based on my experience is more beneficial. Estimating all six parameters required for a close approximation proved very ...
• 63
1 vote

### Iterative Simulation LTspice Model using Python

You can call ltspice from the command line: XVIIx64.exe -Run -b examplecircuit.asc So you would need to modify the .asc file and then run it. You can also run netlist files which are easier to ...
• 84.7k

### LTspice simulating varying capacitance in cap-to-voltage simulation

With LTspice, this is probably easier in an AC analysis as shown in the example below. You can do this in a Transient analysis if clipping is of interest. Use the .step command to change the value of ...
• 10.3k

### LTspice simulating varying capacitance in cap-to-voltage simulation

1 V for the sine input is too "large" ... I used 10 mV. The opamp used is LT1037. Don't have ADA4610 in my database. The opamp shows some "instability" with square wave input. That ...
• 14.4k
Accepted

### How does the leakage inductor distribute over multiple coupled inductors?

With a factor like kc=0.9, energy should be low, and bandwidth should be "low" ... You should use "inductor" something like this. Simulated with "AC Analysis" with ...
• 14.4k
1 vote
Accepted

### How to simulate a uniform distribution around zero in LTSpice?

This works, the tolerance is directly in Volts (flat distribution of +/- 10 mV in that case) (For the copy-paste: {mc(1,tol)-1} ðŸ˜‰)
• 314
Accepted

### Pi-Filter Simulations Comparison

You need to use Wurth's SPICE models, however, the peak response I get using Wurth's models is different from the Wurth modeler. Perhaps Wurth has better models for their modeler. The general form of ...
• 10.3k
1 vote
Accepted

### Is there a way to automatically bring up a plot in LTspice?

Just name your .plt file like your .asc file for the plot settings to become the default ones (both files need to be in the same folder) If you know a way to change this with .op please let me know. ...
• 26
Accepted

### Non buffered CMOS logic gates working under load when using real components (LTSpice Sim)?

Your assumption abort default models MOS is wrong. Rds will not be zero. In fact, the default Kp parameter is very very low $K_P = 20\mu \left[\frac{V}{A^2}\right]$ compared to the real MOSFET that ...
• 15.1k
Accepted

### How can i check what pin is configured to what netlist order from the SPICE model?

I've never used the auto-generate capability. Not once. And now that I see how you used it and what you got out of it, I probably never will use it. This is how I've been creating symbols using the ...
• 11.2k
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### Why does LTC6253-7 not perform properly on LTspice?

It's quite simple. You are using the device outside it's prescribed limits as stated in the data sheet: - ...
• 465k
Accepted

### What is this pin for on LTC6253-7

It is a pin to disable the op-amp. Looking at the datasheet: on page 13 it can be left open or tied high to enable the amplifier. When pulled low, the output is high impedance allowing simple ...
• 16.9k