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Jitter in Strong and Weak Inversions

pcardoso73

Dear all,

 I have designed a crystal oscillator, but some doubts still remain.

 Below please find the schematic attached (Pierce Oscillator).

 

1 - When analysing the phase noise a "bump" appears by the end of the curve (both in strong and weak inversion). What is the reason for that (file attached) ?

 2 -As the crystal is cut for 80 MHz, I use the samevalue for the beat frequency parameter. Is this correct ?

 3 - The biggest problem of all, is when calculating Jitter using PSS+PNOISE the results vary quite a lot due to the upper integration limit. How to set this correctly ?

 4 - Point 3 result's are so dramatic, that weak inversion, exhibits better phase noise results than in strong inversio. In terms of jitter is exactly the same .... I am interested in Jcc jitter.

 

Best regards,

Pedro Cardoso 

 

 

Parents
  • pcardoso73

     Anybody can help me, please ?

     On top of this I would like to ask, what type of PNOISE simulation should be used in a VCO (which will be on a PLL) PM or FM ?

     Best regards,

    Pedro

     

     

Reply
  • pcardoso73

     Anybody can help me, please ?

     On top of this I would like to ask, what type of PNOISE simulation should be used in a VCO (which will be on a PLL) PM or FM ?

     Best regards,

    Pedro

     

     

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