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PLL Loop gain-phase plots

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 Is it possible to get PLL loop gain phase plots without using Matlab? Is so how is this done?

 Thanks in advance,

-Vijay

  • Yes, it is possible to  model a PLL without using Matlab.  The closed loop gain and phase can be plotted without using Matlab.  Cadence may be used for this.  The PLL just has to be drawn in a schematic form using views that represent the functional blocks correctly.

  •  Hi Sharksfan,

     Can you give some pointers on how to do this? If there is a tutorial or other material that provides details, it would be very helpful.

     Best regards,

    -Vijay

  • Cadence has examples in their distribution/installation files.  Look for the pllLib and things like that.  Or even simpler is just to use analogLib or ahdlLib blocks to represent the "gain" of each block.  There are many reference papers for guidance about phase domain PLL modeling which will help you keep all the units correct.  Watch those 2*pi's!

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