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Hello, The model DC characteristic may be ok, but? model with no capacitances is not reasonable.? You might be better off using LTspice logic devices. Rick

Ed, SPICE doesn't have built in signal source with a variable duty cycle.? It is easy to build one with a comparator where one input is a triangular waveform and the other is a control signal that

Hi all, I was missing a CD4007 model, so there it is. It is bare bones hierarchical model (so far) that I left that way so that it is easier to check what I did. If everything goes well, I'll make a

Hello Ed, You could at least use the TIP122/TIP142 from our Files section. http://groups.yahoo.com/neo/groups/LTspice/files/%20Lib Here is the link to the TIP121.

I'm new to ltspice, and am trying to draw and simulate a circuit. This includes a PWM output and a darlington transistor; I searched the libraries and downloaded a new bjt library, but it doesn't

Le 06/12/2013 16:28, Andy a crit : Thanks for this explanation. I just wonder why the OP included this statement.

Just plain ignorance. I didn't know that. I can't find it in the Control Panel. Anyway I wonder why this would be an option...

Maarten, You set up the circuit correctly, but did you determine the phase margin by plotting V(fb)/V(inm)? Doing this I see a phase margin of 72.8 degrees at 9.16 MHz. In think the circuit is ok, but

VARDKES wrote: Does anyone have CD4047BC spice model? > There are models for the CD4047B. I don't know if or how a *BC differs from a *B part. Re-read the directions on this group's main webpage.

ignaciogouetv wrote: Hi, i am new in ltspice and i'm trying to simulate de XR2211(EXAR) but i With enough ingenuity and guesswork, you can create a subcircuit for just about anything. The question is,

Hello Hnguyen, Open your original "wrong" asc-file. Right-mouse-click on the symbol of the source "Vcmfb1_2c" and "Vcmfb2_2c". The V-source dialog window will pop-up. You will see a field "AC

Hallo Helmut, I found 2 extra AC sources in Vcmfb1/2 and It was an accident. Imaging how you found them. Thanks Hnguyen

Hello Helmut & Andy, Thank you for helping me. Helmut: You have defined "AC 1" in two extra sources. This is simply wrong for this application. Instead you should define AC 1 in the input source. By

Hello Hnguyen, You have defined "AC 1" in two extra sources. This is simply wrong for this application. Instead you should define AC 1 in the input source. By the way it's bad practice to hide the

Hello Andy, Your thinking is what I see in "2stages_2CascodeDiff_ACsim_test1.jpg". Andy: I think the main reason is that those two bias sources have a large AC component (10 times the magnitude of the

Does anyone have CD4047BC spice model?

Typically opamps will have low impedance follower type output stages so that open loop output impedance versus frequency remains low (20 to 50 ohms) to well beyond the opamp's gain-bandwidth

Hi, i am new in ltspice and i'm trying to simulate de XR2211(EXAR) but i can`t find a model. Now i'am trying to create de subcircuit but it's too difficult. Asking for help Can i create a subcircuit

Jerry Lee Marcel wrote: For some reason, LTSpice doesn't want to show currents > That's because of this statement on the schematic: .Save V(*) Comment it out and re-run, and you can plot currents.

Dear people, I’m unsure about the stability of my opamp filter/amplifier design. Therefore I wanted to understand gain and phase margin better. Good idea? At the following link Mr. Kris Lokere from