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error in calculating phase noise in TSPICE

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surma

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I m designing a three stage ring oscillator in LT spice and getting a error in phase noise analysis

i use the syntax and getting error below:

Error on line 826 : .noise n1 v1 dec 100 100 500
Bad .noise syntax: .noise V(<out>[,<ref>]) <src> <oct, dec, lin> Npoints StartFreq <EndFreq>
Unknown node in .ic card: "out" -- ignoring
Fatal Error: Syntax error in .NOISE command.

designed oscillator tuning range 800MHz to 11000 MHz.

Thanks!
 

Maybe you really want a transient based simulation and a .tnoise
analysis? I don't think small signal analysis is appropriate to a
large signal, ring oscillator design.

Your error message indicates it wants V(n1,v1) as an argument,
not n1 v1 - might look at the docs for examples.
 
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    surma

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thanks... it works

noise is given in the µV/Hz½ unit ...plz tell me how to convert it into dbc/hz
 

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