Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

praveenroyg

  • 3 years ago

A basic cmos inverter will have a P-transistor upside and N-transistor down side. what happens if we reverse the p and n transistors?

  • This Question is Open
  1. junkyard
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    A P-transistor needs to have the gate at a lower potential than the source by a threshold for a good channel to exist. An N transistor needs to have the gate at a higher potential than the source by a threshold for a good channel to exist. |dw:1359564033579:dw| When in=0, Vgs of the N transistor is negative so it is off. The P transistor's channel will exist as long as the output is Vt volts or higher. In other words the output is pulled down to Vt volts and no lower. It's a 'soft 0'. When in=Vdd Vgs of the P transistor is always positive so it is off. The N transistor's channel will exist as long as the output is Vdd-Vt volts or lower. In other words the output is pulled high up to Vdd-Vt volts and no higher. It's a 'soft 1'. The result: you've got a bad inverter :)

  2. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy