[sdiy] CMOS question CORRECTION.

[Scott Gravenhorst]

music.maker at gte.net wrote:
>My understanding of these devices is obviously
>not complete.  I believe that (for at least the
>N transistor) that the gate voltage needs to be
>referenced to that transistor's source terminal,
>which when used in logic powered by +V and ground,
>is ground.  But what about the P transistor?  It 
>would seem that it's gate ought to require 
>reference to it's source as well, and when used in 
>logic would this not be the positive rail?  This 
>may not be correct, but it makes perfect sense to 
>me, for now.
>
>Recent discussions about the 4069 and 4007
>have made me wonder why some of my recent designs
>work at all!  Namely, my saw to tri shaper:
>
>http://home1.GTE.NET/res0658s/electronics/saw_to_tri_converter.html
>
>This circuit uses only the P transistors from 2 of
>the inverters in a 4007 package.  I grounded the source 
>and drain of one the N transistors, and leave the 
>source of the other N open (due to the way the IC is 
>wired internally).  The drains of the P transistors
                         ^^^^^^----SOURCES! Sorry, I goofed.

>are supplied with a varying *signal* voltage that is
>always less than the positive rail.
>
>If what I said in the first paragraph about the P
>transistors is true, then I don't understand why
>this circuit works, yet, I have built it and it
>works!
>
>Is there something else at work here ?
>
>Thanks for the education so far, guys.  I see that
>I have still a long way to go.
>
>=========================================================  
>- Government: The other religion.
>- The media's credibility should always be questioned.
>- Lambs who lie down with lions are lunch.
>
>-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
>-- Linux Rex         | RedWebMail by RedStarWare
>-- FatMan: home1.GTE.NET/res0658s/TekLab_FatMan_WebSite/index.html
>
>
>

=========================================================  
- Government: The other religion.
- The media's credibility should always be questioned.
- Lambs who lie down with lions are lunch.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.GTE.NET/res0658s/TekLab_FatMan_WebSite/index.html