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Model Report

analogy

This is bit weird.When I was refering to gpdk045 model report, Vth for standard nmos1v transistor for W:L of 120n:45n was 0.36 volts.But as you sweep Vgs from 0 to 1v for a fixed Vds voltage of 1v, it is easy to see Vth to be ~0.5v

Is there a problem ?

Parents

  • Hi analogy,

    If you're looking for a threshold voltage metric that provides design insight over various operating regions, you might consider the "constant-current" method of defining Vth. It's often used by foundries, trivial to set up in simulation, and makes it easy to see the shift due to DIBL. Here's the JEDEC definition, and there are more detailed references online.

    Regards,

    Stephen

Reply

  • Hi analogy,

    If you're looking for a threshold voltage metric that provides design insight over various operating regions, you might consider the "constant-current" method of defining Vth. It's often used by foundries, trivial to set up in simulation, and makes it easy to see the shift due to DIBL. Here's the JEDEC definition, and there are more detailed references online.

    Regards,

    Stephen

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