How to find frequency for ring oscillator in Monte-Carlo analysis?

Really? That's a pretty broad question and it's not clear what you don't know.

Well, you need to set up your basic simulation - either:

• Use PSS analysis (in oscillator mode) and then use the Direct Plot form after simulation to add an output expression with the harmonic frequency that you wanted (probably the first harmonic). You typically would need to allow enough stabilisation time for the oscillator to start, but this should work pretty well.
• Use tran analysis and run for enough time that the oscillator is stable, and then use the frequency function on a clipped part of the waveform (clip the end part of the simulation) to give you the average frequency over a few cycles. This is then your output expression.

Then run Monte Carlo in ADE XL, Explorer or Assembler.

If you need more specific help (for a start, you didn't say which tools you were using, which versions, or what you've tried so far), please give more details on what you're using and what you've tried.

Regards,

Andrew

Really? That's a pretty broad question and it's not clear what you don't know.

Well, you need to set up your basic simulation - either:

• Use PSS analysis (in oscillator mode) and then use the Direct Plot form after simulation to add an output expression with the harmonic frequency that you wanted (probably the first harmonic). You typically would need to allow enough stabilisation time for the oscillator to start, but this should work pretty well.
• Use tran analysis and run for enough time that the oscillator is stable, and then use the frequency function on a clipped part of the waveform (clip the end part of the simulation) to give you the average frequency over a few cycles. This is then your output expression.

Then run Monte Carlo in ADE XL, Explorer or Assembler.

If you need more specific help (for a start, you didn't say which tools you were using, which versions, or what you've tried so far), please give more details on what you're using and what you've tried.

Regards,

Andrew

Hi Andrew

first of all thank you for your replay.

I use cadence 6.14 and calibre 2011, and tsmc 130nm technology. 

i need to how the process variation of nmos and pmos affect the frequency of the ring oscillator (5 inverters ),

i will use this ring to make PUF for IOT applications.

Regards,

Amin