1. mehmet.kl

    LT8316 Flyback Bode Plot

    Hi everyone I am tryig to obtain the gain and frequency plots of a flyback converter controlled with LT8316. LTspice does not provide any frequency response feature but I use middlebrook's method to obtain frequency response. However, result is too weird :( I simply insert a small ac signal...
  2. G

    LTSpice Error Log Unknown Parameter Using Vishay FET Model

    I am hoping an LTSPICE expert can help me with a model. I downloaded a SPICE model from Vishay's website to test a PFET in a power supply design, specifically Vishay SQJ431EP. The model is attached as "SQJ431EP_HS.TXT". If I run this in my design, LTSPICE takes much longer than normal and...
  3. Yourint

    LTspice simulation on 4th order active bandpass filter using multiple feedback and Sallen-Key topologies didn't go as I expected

    First of all, thanks for reading this, I tried to replicate this research as my project (not aim to publish or anything just for study purpose) Reference: https://www.iasj.net/iasj/download/ceca8bad4ee05e7c Now I tried to guess and do what I can do about this circuit and the result is this...
  4. R

    Unknown Subcircuit after creating a custom model

    I'm trying to model a simple mechanical switch that closes at a set time, remains closed for a set duration, and opens again. I am doing this with a behavioral resistor, but I want it to be clear from the schematic that what I mean is a switch, so I created a new symbol. When I attempt to use...
  5. sbya1875

    LTSpice Simulation error with added 3rd party spice model

    Hi everyone, I was simulating a simple RC circuit to find it's frequency response using the following two third party Murata capacitor models GRM155C71H104JE19 and GRM155C71H103JE19 in the following circuit. I received the following error message: Multiple instances of "C1"...
  6. T

    741 Op-amp LTSpice Simulation

    Hi, I am trying to plot frequency response of 741 op-amp by LTSpice. No matter I tried, I can't get the plot to be shown. I am a newbie as I just started with LTSpice yesterday. I have attached the file below, please help me to inspect what did I do wrong. Thank you so much.
  7. O

    How Can I measure MOSFET ro(output resistance), ID(DC current) at LTSpice?

    Viewed 1 time 0 The subject is to make ro=500k, ID=100u by setting VG3,VG4 and W/L of MOSFET. And I got the exact values from Hand-calculation, and am trying to test it by using LTSpice. I did make this schematic. and DC currents of two mosfet was around 74uA (I don't know it is right way to...
  8. the machinist

    I'm getting different results with the LTspice simulation

    Hi, There was an example from my book and I wanted to build the same circuit on LTspice to test the results. However, when I create to simulate the circuit in the LTSpice environment you see below with the different outcome values. and here my ltspice results: I could not find the same voltage...
  9. S

    LTspice circuit problem

    Hello! I'm using LTspice and I'm not quite sure how I'm supposed to do the dependent source as it isn't dependent on a component. The circuit reference and my attempt (which turned out wrong) are attached below: Thanks in advance :)
  10. A

    Sycnhronous converter design in Ltspice

    Dear all, I am trying to simulate my synchronous buck converter and I managed to implement complementary signals to driver two different transistor. The issue is as follows: 1- I inserted dead-time (green circle) but the problem is that at the start of the period two signals overlap...
  11. L

    Why does mutual Coupling changes self resonant frequency and alters frequency response?

    Hello all. I am conducting a simulation based report on resonant inductive coupling. I intend to calculate power transferred as a function of input frequency. For this I used the formulae for self resonant frequency and calculated a SRF of 3.283MHz using 10mH, 235pF and 0.25Ohms as my values...
  12. Veek

    LTSpice - what programming language does it use and how do directives hang together?

    1. So Vim has vimscript, Emacs uses Lisp - what is LTSpice doing? 2. You can use .step to update a {R} for .meas and calculate MAX/MIN etc - how is the data being passed and how do the various directives influence each other? Note in the schematic, he uses {R} and 'r' and R1 and they are all...
  13. K

    LTspice Error

    I am simulating the triac control on example circuit. Alhtough the simulation run sucesfully, I got: in the SPICE Error log at the begging of the simmulation. Do not know where is the line 18 mentioned in the error mesage.I don't know too, how to enable the sweep resistor legend to display...
  14. Z

    2:1 MUX in LTSpice using CMOS Transmission Gates, implementation

    Hello. I am trying to create, for a project, a 2:1 Multiplexer using CMOS Transmission gates. This MUX requires 2 transmission gates, so 4 total transistors. I have seen some implementations use an inverter when connecting the Select bus. I am pretty bad at electronics. Take a look at my...
  15. E

    MOSFET gate , offset PWM questions

    Hello! A little about me , i haven't formally studied electronics, i do not own or have access to an oscilloscope. I have been researching about MOSFETs to use an IRLZ44N as a switch in a basic boost converter, on the IRLZ44N datasheet Vgs(th) = 1v to 2v, as i undertand this Vgs(th) is the V...
  16. hungry

    LTspice ECG

    Hello. Thank you for clicking on my article. I'm from Korea and a college student. I'd like to find a solution. My circuit simulation speed is too slow. So I want to speed up. I saw what other people did at Google and made it. I want to speed up the simulation. I'd appreciate your help.
  17. P

    Triac Simulation Question

    Hello all, New to the forum and came here to get some more information about simulating mains voltage Triac circuits. My issue is the following; I have an opto-isolated TRIAC control circuit for a resistive load (water boiler). I know that Triacs generally have a junction voltage drop of ~1-3V...
  18. Veek

    How do you load a PSpice netlist into LTSpice and run an analysis/generate a schematic?

    So I have this simple resistor divider circuit in PSpice/from a book/NGSpice - how do I load it in LTSpice/Linux/Wine? (I'm reading from SPICE A Guide to Circuit Simulation but I am also reading from Passive Circuit Analysis with LTSpice. The former has the example) I tried manual loading in...
  19. Younes Thabet

    How to import a third-party SPICE model in LTSpice that doesn't have a generic component!?

    Hello all, I don't know if i am supposed to ask this kinda questions in this thread but i am going to anyway! Tried importing a spice model for BAV70 (Dual-diode SOT23 package) after seeing some tutorials, all of them use a a generic component that represents the symbol of the SPICE model...
  20. M

    Simulation of a three phase voltage meter: MOV error (Analysis: Step time too small) LTSPICE

    Hi, I was hoping someone can help me to solve my error on LTspice. I am designing a three phase voltage sensor using voltage divider resitors and a isolated differential amplifier. The voltage range I need to measure is max 440V_rms. I want to add protection by adding a thermistor and MOVs. I...
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