All Questions
46
questions
0
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0
answers
33
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Extracting equation/formula of drain current for the circuit model
I have simulated this circuit model in LTspice. Now I want to do an experimental fit for the graph for transient analysis of Id. Can anyone help me solving this circuit for Id? Or give me an ...
1
vote
2
answers
173
views
Building SPICE models of optocouplers
Looking through this answer about the 6N137 optocoupler I wonder where one can get all those paramaters like Is, Rs, N, various internal resistances, etc. that are used to simulate the optocoupler. I ...
- 13
5
votes
2
answers
522
views
LTspice: weird behavior of simple RC circuit
I try to model a simple RC circuit with input of 2 A DC and I get an out voltage (Vc) of 2 TV. I am not sure what I am doing wrong.
EDIT:
This is for MacOS
- 235
0
votes
0
answers
52
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Build simple LTspice MOSFET model for textbook examples
I am trying to build a simple MOSFET model (very simple, no parasitic capacitance, gate leakage, ohmic contact...) using LTspice to simulate school textbook example, but I don't know how to switch ...
- 623
9
votes
1
answer
406
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Why are these commercial MESFET model parameters unrecognized by LTspice?
I am trying to add a commercial GaAs FET model (ATF34143) in LTSpice XVII for simulation. The model is provided on this website (http://www.hp.woodshot.com/hprfhelp/design/SPICE/fets.htm#ATF34). ...
3
votes
1
answer
489
views
Can I model a diode with higher than usual junction voltage in LTspice using the "Eg" and "Vj" parameters?
I want to model a GaN transistor and include a diode to simulate its reverse conduction above ~2 V with an adjusted diode using the following model statement:
...
- 22.5k
1
vote
1
answer
720
views
How to model reverse recovery diode in LTSpice?
I wanted to update this subject as LTspice has evolved from this post: How does LTSpice model reverse recovery time?
To sum up the above post answered by Ste Kulov:
As Ste Kulov said, LTspice allows ...
- 2,478
1
vote
1
answer
295
views
LTspice, modeling line driver with propagation delay (LH0063)
Question
I'm trying to make a component model for the LH0063 single ended line driver in LTspice... The propagation delay is the dominant parameter for the frequency response but I'm having a hard ...
- 683
1
vote
0
answers
532
views
MOSFET model in LTspice with Miller Theorem
I want to make a MOSFET model in LTspice with a current source and the input capacities to see what happens in the switching process.
I'm not 100% sure but I think it works.
Below is the formula I ...
2
votes
1
answer
1k
views
Digital Potentiometer LTSpice Model
I'm looking to simulate a circuit in LTSpice which uses a U/D-style digital potentiometer like the Analog Devices AD5220. Is there an existing component model with this type of functionality?
If not, ...
0
votes
1
answer
437
views
Photodiode Modelling
I want to model an Avalanche Photodiode (APD) in LTSpice. Is the below an appropriate representation?:
simulate this circuit – Schematic created using CircuitLab
If so, why is the diode ...
- 21
3
votes
1
answer
413
views
How lossy is a ferrite bead in its "capacitive" regime?
When using ferrite beads in spice, I often have the impression that they are not lossy enough compared to the real thing. In particular, the conventional model of RLC all in parallel is basically a ...
- 22.5k
2
votes
2
answers
964
views
Different levels of SPICE models
I wanted to model some components operated in a switching boost power converter at LTspice and i realized that different levels are available for power mosfets.
Do all components have different levels ...
- 735
0
votes
1
answer
280
views
Differential Square Current generator LTspice
I am trying to model a square wave differential current generator in LTSpice for MAX30001 IC, refer page 6 for the specs.
Specifications: Differential Square wave, Amplitude : 8 to 96 uApk and ...
- 121
0
votes
0
answers
49
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How to add transistor model to LTspice? [duplicate]
So, I'm an absolute beginner at LTSpice(I just started today).
I want to know how to add the model of transistor(say model ZTX300 or BC108) to my schematic.
I can't find the model in the standard.bjt ...
- 1