Phase noise Simulation

[abbeyromy]

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
**broken link removed**

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:

**broken link removed**

 

[pancho_hideboo]

I referred to the online documentation at link
**broken link removed**
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?

 

[abbeyromy]

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]

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

 

[pancho_hideboo]

Surely see The Designer's Guide Community Forum - how to start a oscillator's phase noise?

Also I removed the demodulator.

So your problems can be resolved ?

 

[abbeyromy]

yes, I removed the demodulator too and it worked.

Thanks for the help

 

[pancho_hideboo]

**broken link removed**
**broken link removed**

Again, these are too old documents.

So these are not valid or not helpful for current ADS.

 

[abbeyromy]

Yeah, you are right...