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Re: Overriding a library diode's internal parameter(s)
I'd love to get back to this when I am not visiting Mom. Yahoo Mail: Search, Organize, Conquer On Fri, Apr 11, 2025 at 7:02 PM, Bell, Dave via groups.io<Dave.Bell@...> wrote:
By Richard Andrews · #159786 ·
Re: Overriding a library diode's internal parameter(s)
This surprised me when I unintentionally did it: ¡°N" when used in the diode element line sets the number of effective diodes connected in series. N=5 means this one diode in your schematic
By Bell, Dave · #159785 ·
Re: mosfet parameter setting of imported spice model
Wow.? I watched a few minutes of that video.? A few minutes was all I could tolerate.? Incredibly bad. I often say that you should not rely on watching videos to learn anything about electronics or
By Andy I · #159784 ·
Re: Overriding a library diode's internal parameter(s)
Your schematic has two things wrong.? This is *not* how it should be done. * You defined a diode model with a name that already exists.? MUR460 is in standard.dio, in LTspice's diode library.?
Re: mosfet parameter setting of imported spice model
I uploaded "pmos_vds_with_Width.asc" which shows how to do this. Andy
By Andy I · #159781 ·
Re: mosfet parameter setting of imported spice model
Also, don't forget to name the MOSFET with the right model name.? On your schematic, you have defined a P-channel MOSFET model with the name "CMOSP": Therefore, the name next to the PMOS symbol (M2)
By Andy I · #159780 ·
Re: mosfet parameter setting of imported spice model
I did not yet look at the video.? So my answer does not directly refer to your question about the video. But there are two ways to set the Width (and Length) of a MOSFET: * Use the PMOS4 symbol.?
By Andy I · #159779 ·
Re: Overriding a library diode's internal parameter(s)
This is how it should be done, but I got a warning in the log file using version 4. /g/LTspice/files/Temp/AD_PV_Sim%20Rich-04-11-2025.zip
By Richard Andrews · #159778 ·
mosfet parameter setting of imported spice model
Hello,I have imported the tsmc Pdk 180nm shown bellow in the ltspice model. however in the 1:01:06 moment of the video they somehow managed in the menu to get the channel width of the mosfet. Where I
By john23 · #159777 ·
Re: NCS2001
In case I did not state this adequately, the concern is that you would literally fry U3.? Its input pin is being pulled well beyond U3's VEE supply voltage. It does not appear to affect the
By Andy I · #159776 ·
Re: NCS2001
Now the OP tells us that the.ASC is just a fragment of something bigger, so loose ends are to be expected.
By John Woodgate · #159775 ·
Re: NCS2001
It's not that they look funny, it's that the output of U2 (marked 'fb' for 'feedback?), goes nowhere, and the supply rail from C3 looks as if it should power something, perhaps a missing U1? I also
By John Woodgate · #159774 ·
Re: NCS2001
Hi, The line GD16 16 1 TABLE {V(16,1)} ((-100,-100E-15)(0,0)(1m,1u)(2m,1m)) is pspice syntax and accepted by LTspice. You need not change it. The only downside of the pspice syntax is that it is not
By Mathias Born · #159773 ·
Re: NCS2001
Oops, I mis-stated.??I wrote: That should have said, "... even though it previously did and it would be best if it continues to do so. " Andy
By Andy I · #159772 ·
Re: NCS2001
Derek, I have (maybe) good news and mostly not so good news. I think my obsessing over the syntax was somewhat misplaced.? In my opinion this form of the TABLE function is rare, and it's not
Re: NCS2001
Derek, I think your voltage source V1 is wrong.? Its sine wave amplitude is 1.2 V with a DC offset of 0.6 V, so it swings between -0.6 V and 1.8 V.? That goes low enough to violate the Absolute
By Andy I · #159769 ·
Re: NCS2001
Thanks Andy. I will attempt to correct the model when I get back to this next week. I was not sure how to handle the TABLE statement. I do have the latest LTSpice loaded. As for the age of the model,
By DerekK · #159768 ·
Re: NCS2001
I extracted the main simulation I was working on. The .asc is the portion that should work. It is just that I was getting errors about the model.
By DerekK · #159767 ·
Re: NCS2001
Derek, If I am right about the formatting of the G-source TABLE() functions, you can modify them like the following: First TABLE function (1 of 12): old line:? GD16 16 1 TABLE {V(16,1)}
By Andy I · #159766 ·
Re: NCS2001
I still get the "timestep too small" error.? ?But I'm using the computer with the older LTspice version today. See the FAQ ( /g/LTspice/files/z_yahoo/FAQ/faq_17-2.txt ) file for
By Andy I · #159765 ·