LTspice question

Thread Starter

Kermit2

Joined Feb 5, 2010
4,162
I'm a breadboard guy, from way back. Haven't done any of it in ages though. So with all the talk and referenced to spice i've seen here, I downloaded it and am playing around to get a feel for how it functions.

I'm a little puzzled by the lack of two input logic devices. They all seem to be three input models, but that's OK.

What I need to know is how do you get a gate to give a 5 volt output amplitude. I'm triggering an AND gate with two different speed pulses and it functions correctly for the inputs I'm giving, but WHY does it only go to 1 volt amplitude? ???
 

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eblc1388

Joined Nov 28, 2008
1,542
You can change the logic high output voltage by right clicking on the AND gate and in the popup menu, enters "VHigh=5" in the attribute row(i.e. the fourth row) marked "Value".

 

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Thread Starter

Kermit2

Joined Feb 5, 2010
4,162
That's easier than I thought it would be. I spent most of the night(since I wasn't sleeping anyway) reading through the library and trying to figure out how the model info is written and what its doing, then I went looking for the 'AND' gate model only to discover that it wasn't there. :confused:

Still I learned alot, and increased my desire to break out my old breadboarding stuff as well. :)

Thanks for the answer,
Kermit
 
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