All Questions
252
questions
0
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answers
25
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Is this LTSpice simulation of arduino's command for relay corrrect?
Here is a LTspice simulation for based on the video Design Relay module PCB using Altium designer
To me, it seems ok, but i am lacking of experiences.
What is your opinion on this LTSpice simulation ...
- 129
0
votes
1
answer
66
views
LTspice sofware Zener diode model 3bdc missing [closed]
I cannot find any models for LTspice for Zener diode breakdown voltage of 3 V. I need Zener diode because I am trying to get simple voltage stabilizer and my load cannot handle more than 3 V. I cannot ...
- 45
2
votes
1
answer
121
views
LTspice and ngspice simulation results differ by 5-6GHz
I simulated a basic CMOS inverter based 3 stage ring oscillator in both LTspice and ngspice, using the same model files (using NCSU's freepdk45 models (VTG slow slow corner)). I expected there to be ...
- 505
0
votes
1
answer
70
views
LTSpice Unknown SPICE device type "N" [closed]
I try to use the model for the BFR106 transistor in LTSpice, which I got from here
https://www.infineon.com/cms/en/product/rf/rf-transistor/high-linearity-rf-transistors/bfr106/?tab=~%...
1
vote
1
answer
99
views
OpAmp Offset Null Pins in LTSpice
I'm simulating the following circuit, where the Op Amp is an LM741:
The LM741 is an 8-pin device, and this design calls for using 7 of them. From the datasheet, here are the pin connections:
I have ...
- 13
0
votes
0
answers
68
views
How to solve the LTspice error "Questionable use of curly braces in xxx."?
When I set up the following circuit, I ran into a question about the use of braces({})
The following are error messages：
Why can't the first V be recognized by LTspice, or is something else wrong?
- 1
1
vote
2
answers
177
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
2
votes
2
answers
192
views
Clipping of output waveforms in a push-pull amplifier circuit with op-amps, how to fix?
I don't know what the circuit is called; I found it in the suggested schematics of a Resolver to Digital Converter IC.
The circuit is an amplifier circuit that has two push-pull amplifiers and a bunch ...
- 21
2
votes
1
answer
98
views
How would I create an analog block function in LTSpice?
I'm trying to create a small-signal model of a PSFB converter in LTSpice. The blocks in red are what I am trying to create, essentially a multiplier block which computes various .PARAM parameters that ...
- 73
1
vote
0
answers
807
views
How do I properly import a .lib description into a LTspice symbol?
I am trying to simulate the TI part TPS62808 in LTspice, Pspice for TI, and Tina TI. I managed to easily run the simulation in the latter two simulators, but the models were specifically made for them,...
3
votes
2
answers
171
views
Wrong LTspice simulation results when circuit has a large common mode potential to ground node
I'm trying to simulate the effects of a common mode signal on an optically isolated analog input circuit. I was seeing terrible common mode rejection ratios no matter what changes I made, and ...
- 8,661
0
votes
1
answer
168
views
LTspice - auto-transformer impedance ratio
Can you please clarify what formula is used by LTspice to calculate the auto-transformer impedance transfer ratio for the equivalent circuits below?
Both circuits resonate on the same frequency. I ...
- 13
2
votes
1
answer
112
views
VOM617AT SPICE model not working
I downloaded the VOM617AT (optocoupler) SPICE model from the following address:
https://www.mouser.com/ProductDetail/Vishay-Semiconductors/VOM617AT?qs=9vrc9xEJKyxW%252B%2FlvaQ%252BSPg%3D%3D
I am not ...
- 133
1
vote
0
answers
182
views
Flyback converter simulation in LTspice: discrepancy between Switching model and Averaged Switch model
I´m trying to make a Averaged Switch Model of a flyback converter for transient and AC simulation in LTspice. I´m following the document "Advances in Averaged Switch Modeling and Simulation" ...
- 11
1
vote
0
answers
78
views
Difference between Kelvin and Celsius in dynamic thermal behavior of MOSFETs
I am trying to understand the temperature behavior at the junction level and this Application Note "AN_201712_PL11_001" from Infineon describes the process.
The problem is that I have a hard ...
- 103