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How to understand the Verilog A model of OSC in rflib, candence's library?

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fjiang

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The source code is as follows:
1.png
2.png


  • In the red box, why differentiate the noise voltage?
  • “vc = sqrt(2)* V(int)/amp ” should how to understand?
  • In my opinion,in the case of small vc, this can be converted into phase noise.
    3.png

  • But I have some questions about the above two sentences,please help me.
 

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