ltspice

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    How to use a voltage controlled switch with Ltspice

    Hi, I would like to make a simulation with 3 voltage controlled switches with Ltspice. Below, the circuit : But, there is a problem. If I put 1V or 0V, like in the picture, in input of the switch there is something in both output. I don't understand why. Any ideas ? Thank you in advance.
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    LTSpice amplifier oscillation. Why DC and AC analysis don't match?

    Hello. I'm simulating a simple amplifier to be used as input and VAS stages for an audio power amp. It uses negative feedback. The gain is 20, fixed by the ratio of R4 / R3. I know this kind of circuits usually need some kind of frequency compensation to avoid oscillations. The circuit is...
  3. Measuring LCL and OVP thresholds in LTSPICE

    Hi there! I've been given a group of circuit schematics for testing and I must measure the current and voltage thresholds on a Latching Current Limiter and Overhead voltage Protector respectively. I know how to simulate and measure currents and voltages in LTSPICE but something about the...
  4. LTSpice - Move horizontal axis to center of plot

    Is it possible to move the horizontal axis so that it matches the vertical axis' 0 in LTSpice? Instead of: https://imgur.com/eYcBMe3 (horizontal axis at -5!) it would look something like https://imgur.com/geqv2B3 (horizontal axis at 0) It's really annoying, because when plotting a function...
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    Simulating IGBT in LTSpice

    Hi all Can anyone help me to simulate an IGBT in LTSpice I am trying to create a model for the IGBT in the datasheet attached I am not 100% how I go about doing this in LTspice I know that in the new version of LTSpice there are nIGBT's but I am not sure which parameters I need to add to this...
  6. LTspice model for CD4060B 14-stage binary clock/counter

    Attached are LTspice simulation model files I made for this popular IC. The model is not a stand-alone one; it requires use of input filter and output driver models found in the CD4000.lib and CD4000_v.lib libraries freely downloadable from the Yahoo LTspice User Group. The model is a...
  7. HSPICE to LTSPICE

    Guys, can somebody help me with converting HSPICE library to LTS? Actually i have 2 types of model HSPICE and ISPICE, i just need to convert one of them to LTSpice, or PSpice. I need to converse only one component. 470pF 100V 0805 TY.
  8. Singular Matrix Error Sometimes in LTSpice

    Hi, I've been looking all over the internet for an answer, but can't seem to find one for my problem. I have a rather large circuit (switch mode power supply) that I'm simulating in LTSpice, but in order to get the simulation started, I must hit stop and start multiple times to get past the...
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    LTspice Thin Film Resistor Simulation

    Alright, my question is pretty simple to ask but perhaps rather difficult to solve. I am modelling in LTspice a channel of previous design and analysing various noise figure across the channel. Currently I am using the stock resistors supplied in LTspice. I was wondering if there is a way to...
  10. Post-Processor for LTspice

    Hi All, Recently wrote this little script for Octave/Matlab and thought I'd share it here in case it is of any use. I had a look to see if there was a native way to extract the data I wanted (or if someone had already writen a post-processor) but couldn't find anything. If another (better) way...
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    555 Beginner problem

    Hi I have this assignment, and I have absolutely no idea what I’m doing. I need to design a circuit that produces the output as attached. T1=1ms Duty Cycle1 = 0.75 Duty Cycle2=0.75 T2 can be calculated from T1 tpw3 can be calculated from T2 I have to use monostable and astable...
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    LT1158 gate driver for a current bidirectional converter

    Hello All, I'm building a boost inverter circuit and I've decided to use the LT1158 gate driver because it has a built in shoot through protection. I'm using a sinusoidal pulse width modulation control scheme for the circuit. I'm having issues getting a sine wave on the output of my converter...
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    low dropout regulator

    Hi I made this Low drop out regulator and seems to have errors like small length and narrow width in AC analysis... I can't figure out how to fix this.. please help.. I got no problem in dc opt pt of LTSpice since I got my desired output of 800mV..
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    Power Supply Rejection in LTSpice

    Hi. I am struggling in getting the power supply rejection in LTSpice. I am to design an LDO of regulated output of 0.8 with accuracy of +/- 2%. The power supply rejection is the only thing left. please help me get a 20dB PSR
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    Simulation of TDR using LTSpice

    Hi all, I'm trying to simulate a TDR based on the figure below, and one of the scenarios is a short circuit. The simulation should last for 140ns. The parameters are ZA = 50 Ω TA = 5 ns ZB = 75 Ω TB = 10 ns Rise time of source signal τr = 0.1 ns I took this website as reference to come up...
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    LT SPICE Importing subcircuit Problem

    Hiee All, I was working on LTSPICE, while creating Subcircuit i was getting the message like "usually this is a permission problem" , please let me know what exactly it means. Thanks in Advance.
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