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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Spice 3f5 Lunetta Simulations
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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
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PostPosted: Wed Jun 27, 2012 4:29 pm    Post subject: Spice 3f5 Lunetta Simulations
Subject description: Transistor Level Sims!
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At JovianPyx's suggestion I started looking into simulators. It seems that our best simulator for Lunettas is Spice 3f5, available cross-platform and as MacSpice for my Mac. I've started working on a library file and have created some test files and captured one early plot. It's beginning to shape up nicely.

If this keeps up, we will soon have the capability to do mixed signal simulations of practical Lunetta circuits, and be able to share files with each other despite our community's use of three different operating systems. I love the idea of not having to wire up anything to simulate a Lunetta, and also the ability to explore circuits that I don't have the chips for at the moment without having to wait for a parts order is nice.

Anyway, for all the reasons that simulators rock, here we have the beginnings of our own library file!

Les


CD40106_test.jpg
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 Filesize:  47.83 KB
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CD40106_test.jpg



CD4000em.lib
 Description:
the em library file for 4000 series cmos, with a few basic models already!

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 Filename:  CD4000em.lib
 Filesize:  2.68 KB
 Downloaded:  81 Time(s)


Generic_test.cir
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 Filename:  Generic_test.cir
 Filesize:  487 Bytes
 Downloaded:  70 Time(s)


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Last edited by Inventor on Wed Jun 27, 2012 10:25 pm; edited 1 time in total
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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Wed Jun 27, 2012 4:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Some more circuit files for simulation...

Les


CD40106_test.cir
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 Filename:  CD40106_test.cir
 Filesize:  424 Bytes
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CD4013_test.cir
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 Filename:  CD4013_test.cir
 Filesize:  560 Bytes
 Downloaded:  58 Time(s)


CD40106_4001_4011_test.cir
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 Filename:  CD40106_4001_4011_test.cir
 Filesize:  491 Bytes
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Uncle Krunkus
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PostPosted: Wed Jun 27, 2012 4:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

This great stuff Les. salut
Could be very useful for all manner of tests. Very Happy
Where do you get it?

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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Wed Jun 27, 2012 4:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
This great stuff Les. salut
Could be very useful for all manner of tests. Very Happy
Where do you get it?


Oh, I'm just having fun and I guess that leads to good things!

Les

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Inventor
Stream Operator


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Audio files: 258

PostPosted: Wed Jun 27, 2012 9:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

OK, progress report. At this time all the logic works just fine, however I have been building D flip flop models for the CD4013 and CD4015 chips. The data sheet shows the schematics for these, which involve transmission gate feedback and feedforward, two-phase clocked. That's where the trouble arises because the DFF's components must be sized appropriately and I have little understanding of how to do this properly.

The CD4013 works well unloaded in forward propagation only. When i feed Qn back to D to make a TFF, the data just rails to VDD or VSS. I'm thinking that maybe I will also make some models that are not direct implementations at the transistor level, but are more behavioral models that simulate on a register transfer level rather than a transistor level.

Well, at least everything works fine in feedforward mode. That's something I guess...

Les

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elmegil



Joined: Mar 20, 2012
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PostPosted: Wed Jun 27, 2012 9:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'll echo the comments, these are excellent and I expect to be useful.
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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Wed Jun 27, 2012 10:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

elmegil wrote:
I'll echo the comments, these are excellent and I expect to be useful.


That's what I live for, what motivates me! OK, here is the library file at this time, attached.

Les


CD4000em.lib
 Description:
the latest library file, flaws and all

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 Filename:  CD4000em.lib
 Filesize:  4.23 KB
 Downloaded:  90 Time(s)


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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Thu Jun 28, 2012 3:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Well I got some sleep and woke up fresh, realized that the transistors were of course improperly modeled with a knee at 2V rather than 1V. I changed them to 1V and resized some things a bit and fixed a wiring error, got the CD4013 and CD4015 models working - to a point.

Now they do work, indicating that the models are functional, but when I hook them up to other devices they fail. I suspect loading and timing issues that I will study soon. So, some good progress but still no cigar.

Les


CD4015_test.jpg
 Description:
output of working simulation
 Filesize:  65.57 KB
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This image has been reduced to fit the page. Click on it to enlarge.

CD4015_test.jpg



CD4015_test.cir
 Description:
test circuit with one cd4015 working correctly but not two and not with output resistors

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 Filename:  CD4015_test.cir
 Filesize:  867 Bytes
 Downloaded:  79 Time(s)


CD4000em.lib
 Description:
latest library file with major changes :)

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 Filename:  CD4000em.lib
 Filesize:  4.25 KB
 Downloaded:  76 Time(s)


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