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.

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...

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...

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...

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...

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...

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.

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...

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...

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...

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...

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...

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..

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

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...

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.