Hi, In this excersise (pic) I have to simulate Vin and Vout of an JFET common source amplifier in PSpice, but running the simulation I receive results not that I expected for (pic)
any idea why this happens ?
https://preview.redd.it/2hxab089o3981.png?width=681&format=png&auto=webp&s=74850fb0df65c1d21d577bea4f9e78feca117e15
https://preview.redd.it/5r0t4r79o3981.png?width=1619&format=png&auto=webp&s=5f4d48c0212542e67e180f762dfe6ad0cb51cc60
I have a few questions actually. I'm trying to figure out how to translate the physical equipment I use in the lab to pspice. On the func generator, what is the AC value supposed to be? Can it just be 0 to just deal with amplitude and frequency? Also, why is it showing 16.75V right after the DC psu? Shouldn't that be very close to 20V? Thank you for your help! I don't really have a reason for doing this, I just like seeing if I can recreate physical circuits onto pspice.
Hello, my computer at work is not connected to the internet. Does anyone know a why to install PSpice for TI on such a computer?
Thank you
For reference, i last used pspice 2 years ago so things are grey, but it's not too hard to pick back up. Currently ive built the circuit below, essentially a signal comes from the ports on the left to the r/S latch to then output to the or gate, which in turn controls the turning on or off of my relay, but for some reason i get an error stoping me from simulating because Pspice can't simulate the OR gates, r/S latch, or the relay. For the TI chip i would understand why i can't simulate it but why can't i simulate the OR gates or the relay? I even changed the relay to a generic one i found on the pspice library search website, same goes for the OR gates. I'm gonna try to build it in TINA-TI later but currently i'm completely stumped and just need help from people more knowledgeable than me.
On another note, i can make those four OR gates into one 4 input OR gate right? disregard the second pin on all of them, that is a placeholder for an optional bypass switch.
https://preview.redd.it/0i0hnnzzy0081.png?width=957&format=png&auto=webp&s=606feaa30b360969caa1594123e06539ac78c376
At my University we are learning Pspice and I’m curious if it is still used in the field or if there is anything newer and better?
If yes, what field do you use it in? What specific things do you use it for? Are there any suggestions for other software to learn for EE major?
Thank you!
hello there
i need some help, Ive got this zener diode but i dont know what should i change in the picture
the Vzt=9.1
https://preview.redd.it/ju0j4f0ksk181.jpg?width=1600&format=pjpg&auto=webp&s=1dbcf5c0437ff4996731a1ab77c6c325a0abd0f3
I'm simply testing stuff out, but I keep getting:
No compatibility mode selected!
warning, can't find model irlz34n
Circuit: KiCad schematic
Error on line 5 :
q1 net-_q1-pad1_ net-_q1-pad1_ net-_q1-pad3_ irlz34n
could not find a valid modelname
Note: can't find init file.
******
** ngspice-34 shared library
** Creation Date: Tue Feb 2 12:29:13 UTC 2021
******
Error: there aren't any circuits loaded.
picture: https://gyazo.com/60f80eab050da438fa70d8c20d897c28
What can I do to fix it?
Thank you!
I'm building a simple RC circuit and want to simulate the output across the capacitor. The input is a "step voltage" of 5V for t > 0 so I've just used a simple DC source.
I'm getting just a flat response of 5 V for both the input and the output so I must be doing something wrong. I realize this is pretty basic but any help will be appreciated.
https://preview.redd.it/75irm9k6ad761.png?width=1847&format=png&auto=webp&s=8c900802dd9ccb3e12541b791d2b2f8c934ee7e2
I found a unencrypted model here ( LME49724 ) https://www.ti.com/lit/zip/snam091
And NE5534: https://www.ti.com/lit/zip/sloj049
I don't know if those are compatible with LTspice, since they are Pspice models.
If they are, the .mod files goes in:
\lib\sub
And the .ASY files in: \lib\sym\Opamps
Is that correct?
Hello, I come here hoping someone might be able to help. I am taking a Microelectronics class my Professor wants us to use PSpice, since I am currently waiting for the Student version to be approved I am unable to use PSpice because I have a MAC, and the trial is only for Windows.
The lab asks that we use the Diode: D1N4001 and D1N1190 from PSpice, can someone help me recreate these on LTSpice? I know LTSpice allows you to specify the Diode type but I don't see D1N4001 and D1N1190.
Thank you in advance for any help.
EDIT: Found the following in an ALLABOUTCIRCUITS Thread.
[.MODEL D1N4001 D IS=29.5E-9 RS=73.5E-3 N=1.96 CJO=34.6P VJ=0.627 +M=0.461 BV=60 IBV=10U]
Hello everyone,
I was looking for a new laptop and I find out that macbook m1 chips are doing great and I thought it would be nice to have some change and I decided to buy a macbook rather than a windows pc. However, I am an EE engineering student and there is a programme i will be required to use for my next year education which is called as pSPICE. Although there are alternatives for pSPICE, I specifically want to use this programma and there is no compatibility with iOS. It is a only windows and linux programme.
Few days ago I just realized parallels and virtual windows machines. Some say it works perfectly fine and some says there are some errors and it needs to be developed even further. Is there anyone using macbook with parallels for pSPICE programme ? Is it working without any problem ?
For reference, I need to build a circuit with a few elements (simple), but one of those elements is a voltage source that is represented by 10exp(-12t)cos(1000pi t).
I've tried several things to get a time varying voltage source in PSpice. I've looked at the VEXP source, which would give me the exponential part of the V equation. VSIN can give me the sine part of the equation. However, I cannot use exp or t in an expression for the amplitude. It just gives an error every time.
I have searched all over the internet but I can't find anything about "variable amplitude" or "time varying" voltage sources. I also can't find anything about it in my textbook. Yet, a problem in my book asks us to use one.
I have to implement this in pspice AD, but I figured I should get the circuit working in caapture CIS first.
Any help would be greatly appreciated.
Basically what the title says. It needs to have project formats compatible with PSpice, as I need it for uni labs. (I'm looking for something similar to what Octave is for Matlab)
I'm a sophomore doing a Bachelor's in Electronics and Communication. Due to the pandemic, our college skipped the Lab classes, but I've decided to complete them on my own. For our Circuit Simulation classes we were supposed to work on the schematic and analysis using PSpice (2009 edu version, by orCAD. NOT Sure though ). So, after configuration and everything when I started the simulation, it's showing "Error -- Node N00022 is floating". I've tried searching on web for solutions but couldn't find any which could solve this issue. Can you please suggest what should I do to resolve this? Any tutorial on PSpice free-version, on circuit simulation and suggestions for other software's (preferably open-source or free) are also appreciated.
Thank you all in advance.
Circuit schematic, error and Output file: https://www.reddit.com/user/GhostUser101/comments/li8ka7/pspice_911_circuit_simulation_help/?utm_source=share&utm_medium=web2x&context=3
This was the software link: http://www.eng.auburn.edu/~troppel/91pspstu.exe
Does anyone know which ENCS Hosts (which 'lab ie. H921,etc.) have Cadence software? Have a quiz today and local version is messing up!
Thanks a lot for your time.
https://preview.redd.it/y6dr1sz1bkt51.png?width=1051&format=png&auto=webp&s=9f3e07ad917c44c2b5c85a828e2150c1372032a5
https://preview.redd.it/olhp8vz6bkt51.png?width=1498&format=png&auto=webp&s=43acd1d5fa0c3472af135ce2e38250c1f25163bf
https://preview.redd.it/7aqvk5e8bkt51.jpg?width=3024&format=pjpg&auto=webp&s=088bd9f709c7fdb47c742caabea0fd59c14e492f
The figure from my notebook shows the expected behavior of the comparator in the second and third plots. The issue is that instead of the outputting a 0 (Ground) when the input signal is negative, pSpice asserts a high signal. I was hoping someone could tell me if this is an issue with the spice model or if this is simply how the device operates. I tried to fix this by running the input through a diode to half wave rectify it but this offset the signal instead which is another strange effect that I attribute to the pSpice model being faulty in some way.
https://preview.redd.it/uv53y63qckt51.png?width=1496&format=png&auto=webp&s=4c83ec656bbab4024b9e09adfa2ecda52eaf967b
Edit: Phase Reversal threshold pointed out by u/triffid_hunter.
https://preview.redd.it/4objdoufgkt51.png?width=1079&format=png&auto=webp&s=096bd3e3f37bcf160be12311d923eb6bf1135ecb
I have no clue what I'm doing.
I got project to simulate 3 phase inverter in PSpice that controle induction motor. Goal is to choose transistors, that are part of inverter, with smallest posible dissipation (radiators on inverter to be small). Those transistors should be MOSFET. I'm looking for modern solutions (one of them is using GaN transistors). I'll list details for this project:
- Inverter DC bus is 24V (ideal, no oscillations).
- Commutation frequency of MOSFETs NOT under 16kHz.
- MOSFET must have substrate diode.
- Inductiom motor 1.5kW
- PSpice scheme with simulation.
- Losses on transistors.
Do you have some suggestion which transistors should i use and how to calculate losses?
Here is what I have done by far and what problems do i have with simulation:
https://preview.redd.it/p4z71cohnim51.png?width=1018&format=png&auto=webp&s=5cab10124da6f31442e8a69f07b13dcc517fea73
This MOSFET, used in this scheme, is some that i found that satisfies what is needed in project. I control transistors with this scheme (only for A1 and A2 MOSFETs. I have other two same schemes for B1,2 and C1,2, they are moved by 120 degrees, each):
https://preview.redd.it/5jbq6hsinim51.png?width=716&format=png&auto=webp&s=6c863b35088d97264013c33080287bd2f8f084ae
This is what i got from this:
https://preview.redd.it/rxdxqtxjnim51.png?width=1329&format=png&auto=webp&s=9b7e3e20ae5cf1d205be2a43b9adb3e8913b6e5e
I'm not sure why there is DC component here (it oscillate around 1.2V). Not sure why amplitude is so small, shouldn't it be around 24V (smaller, but around 20V at least).
So, please help me, tell me where I'm making mistake.
At the end, sorry for my bad english! Ask if something is not clear, I'll try to explain better.
Thanks!
I have a very general idea of PSpice: when you drag and drop the circuit pieces and connect them, the program is actually generating a text-based netlist. It then runs a series of iterative simulations until it converges on final values for each net.
That's about as much as I know about PSpice. My question is: how are more complex things like op-amps (with all their own unique frequency responses, parasitics, etc.) modeled? When I simulate circuits like this, I'm basically putting all my trust in this PSpice model with no real way of confirming its accuracy.
I'm also asking this because a lot of the more senior engineers I work with seem to know so many ins and outs of the tool. For example, when they see that a simulation isn't converging, they'll know its because the simulator is freezing up at a capacitor, and adding a parallel 1 gigaohm resistor (basically like its not there) will fix it. I have no idea why it works, but it sounds like something the senior engineers knew to do because they understand how PSpice runs the simulations.
What are some other little nuances like that in the software? What are some limitations and things to watch out for in the tool? Any advice, especially in the context of testing and troubleshooting would be greatly appreciated!
Hi,
I don't know how to construct a PSpice model of MOSFET that are not included in basic libraries in OrCAD PSpice 17.2.
I found somewhere that MOSFET can be modeled with the template statement
.model MyMOS NMOS (Level= Rg= Rd=5 Rs=1 Vto= Kp= Cgdmax= Cgdmin= Cgs= Cjo= Is= Rb= )
but I have two problems here.
First, some of this parameters cannot be found in datasheet (I assume that they have to be calculated, I don't know how).
Second, I want to build more accurate model of my MOSFET. It looks to me that this parameters won't give you good model. I'm not sure.
Here is the datasheet of one of MOSFETs that I want to model:
http://www.hotenda.cn/static-pdf/DMTH3002LPS-13.pdf
Sorry for my bad english.
Thank you!
Hi everyone im on my 3rd year of university and i have a project to design an amplifier that amplifies the vin 100 times in orcad and i cant figure out how to make it amplify i'll post some screenshots of my simulations and design maybe someone can help.
this is my time domain simulation green is the input red is the output
I know that a lot of us use LTSPICE for their simulations, but TI just released a new version of their SPICE software which is built on the cadence backend. It appears to be much better than the old TINA software and might be worth looking into. See below for the link (note: you do need to create a ti.com account to get access to the license).
So I am trying to do a simulation at Pspice and while it shows that the circuit has no errors the results are very wrong. This is the first time I have ever used this and I can't figure out what is wrong.
https://preview.redd.it/jsl0b2ra4wz51.png?width=786&format=png&auto=webp&s=60010a1b6c9d2a0fd572373124a176874932bd54
