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How to build a TGATE using discrete CMOS

Discussion in 'General Electronics Discussion' started by bastrummis, Mar 7, 2012.

  1. bastrummis

    bastrummis

    2
    0
    Mar 7, 2012
    Hi,

    I've been looking for a solution on how to build a transmission gate, using
    discrete NMOS/PMOS transistors.

    The catch is, as far as I understand, that you need to be able to connect the
    substrate to either Vcc / Gnd for the different transistors. Most discrete transistors
    have the substrate-lead already pre-bonded to Source or Drain...

    Anyone have a suggestion on how to proceed?

    (The grander project is about creating a strictly PMOS/NMOS based computer, of course ;-)
     
  2. duke37

    duke37

    5,211
    718
    Jan 9, 2011
    The 4066 manages to do this, does it not?
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    Have a look at the 4007. It provides a number of basic building blocks from which you can create this and other types of gate.
     
  4. bastrummis

    bastrummis

    2
    0
    Mar 7, 2012
    Ah, yes, I have looked at the 40xx series, and indeed the 4007 has a number of correctly configured mosfets.

    I only forgot to mention that I wanted to build it from 3 and 4-leads discrete transistors :)

    So basically I would want 1/4th of a 4007 in a small footprint SMD casing.

    Any leads?

    Regards/M
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    Maybe you want something like this.

    They are available. But you're going to have to find an N channel version, and I leave that as an exercise... (I couldn't find one in the few minutes I spent searching)
     
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