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About the effect of the PVT process on the LC VCO

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hanen88

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I would like to display the frequency variation of an LC VCO with temperature. Hence, i used harmonic balance and options existing in ADS? However, when i put the variable'Temp' as a sweep parameter the simulation doesn't work. I ask how can i use this template to display the frequency variation with temperature ( ranging between 0° and 100°).
I'm so grateful to help me:
sincerely
 

Use "temp" instead of Temp..
You can define this variable directly in HB Controller's Sweep Variable section..
 
It 's OK, i can run simulation. I put so the equation HB.freq[1] to display frequency, however i don't have the right curve which is given as below. What can i do to correct it, i ask if i should modify some parameters in Harmonic balance about the frequency. PVT.png
 

If none of the circuit parameters is temperature dependent, won't we expect a graph like this?
 

But, there is an LC VCO oscillator which contains varactor. What can i do to correct it. If you have a clear tutorial please send to me, i'm so grateful

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Also, i ask if i should add temperature value of each component of my LC VCO, or where is the matter
 

Rethinking the problem I wonder how you manage to measure VCO frequency in HB analysis.
 

To measure VCO frequency, i used just transient analysis which display the frequency spectrum. Concerning HB analysis, i just used it to determine the frequency variation with temperaturen i just add frequency=4GHZ and sweep variable is 'temp'. Moreover i put the options. Taking account that i don't do another thing like measure operating frequency.
I ask if i hould use HB analaysis to measure frequency in the same time i use option to display frequency variation with temperature/

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There is a capture of my project VCO, please help me to display frequency with temperature
VCO.png

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I should modify frequency; there is the right capture VCO1.png
 

Have you ever assigned a Osc_Port or A differential Node Pair for Oscillator Observing Point ??
In other words, is your oscillator really working without changing temp variable ?? I don't think so..
 

I found only the solution i should activate enable oscillator analysis. Finally i obtain this curveVCOO.png
 

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