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Phase noise Simulation

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abbeyromy

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Can you please help me in simulating phase noise in ADS?

Please refer to attached ADS design project.

I referred to the online documentation at link
https://cp.literature.agilent.com/litweb/pdf/ads15/pdf/cktsim.pdf

PAGE 170 talks about using hb_noise.vout.pnfm phase noise (in dBc) from frequency sensitivity analysis

so I created an equation Phase_Noise=hb_noise.PNoise_OL.pnfm but the tool gives me error as "hb_noise undefined"

With the present circuit can you help me understand how I can simulate phase noise?

The purpose of the activity is to know at what Quality factor I can achieve an acceptable value of phase noise.

Reference:

https://www.odyseus.nildram.co.uk/RFIC_Circuits_Files/LC_Oscillator.pdf
 

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  • phase_noise.zip
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pancho_hideboo

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I referred to the online documentation at link
https://cp.literature.agilent.com/litweb/pdf/ads15/pdf/cktsim.pdf
PAGE 170 talks about using hb_noise.vout.pnfm phase noise (in dBc) from frequency sensitivity analysis
This is a too old document for ADS1.5.

What version of ADS are you using ?

"pnfm" is not available in current ADS.
Currently "pnmx" and "anmx" are available.
Harmonic Balance for Oscillator Simulation - ADS 2009 -*Agilent EEsof Documentation Center

The Designer's Guide Community Forum - Augmented Pnoise of Cadence Spectre
The Designer's Guide Community Forum - Interpretation of Minimal value in LSB-Noise of Crystal Oscillator
The Designer's Guide Community Forum - how to start a oscillator's phase noise?
 
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abbeyromy

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Hi Pancho,

I am using ADS 2009 update 1. Thanks for the links but I still could not figure it out what equation or inbuilt function I can use in ADS with the present circuit that I have attached.

If possible can you please look into the attached design file and guide me?

Thanks

Hemanshu Abbey
 

abbeyromy

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Hi pancho,

I followed some links by you and now I am able to simulate the phase noise. The tutorial circuit is not working still. I took help from my professor to get it working.

I had to add an extra 50 ohm in parallel to the source so as to make sure i am getting 10dbm of input power. Also I removed the demodulator.

Thanks for the help
 

abbeyromy

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yes, I removed the demodulator too and it worked.

Thanks for the help :)
 

pancho_hideboo

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