# Two tone nonlinear simulation in ADS

1. ## Two tone nonlinear simulation in ADS

In two-tone nonlinear simulation. How much should be Fspacing? And also is it RF frequency should be the centre frequency?

Note: my target frequency band 3.4-3.6 GHz. thanks  Reply With Quote

2. ## Re: Two tone nonlinear simulation in ADS

Hi,

I'm no HF specialist, but afaik Fspacing depends on the input (data) frequency.

Klaus  Reply With Quote

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3. ## Re: Two tone nonlinear simulation in ADS

Set all frequencies inside bandwidth of DUT.
Where all frequencies mean f1, f2, 2*f1-f2, 2*f2-f1.

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4. ## Re: Two tone nonlinear simulation in ADS Originally Posted by pancho_hideboo Set all frequencies inside bandwidth of DUT.
Where all frequencies mean f1, f2, 2*f1-f2, 2*f2-f1.
How to determine f1 & f2?  Reply With Quote

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5. ## Re: Two tone nonlinear simulation in ADS

Show me lower and upper frequencies for 1dB bandwidth of your DUT.

What analysis method do you use ?  Reply With Quote

6. ## Re: Two tone nonlinear simulation in ADS Originally Posted by pancho_hideboo Show me lower and upper frequencies for 1dB bandwidth of your DUT.

What analysis method do you use ?
Lower frequency 3.4 GHz, Upper frequency 3.6 GHz  Reply With Quote

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7. ## Re: Two tone nonlinear simulation in ADS

What analysis do you use ?
HB or Tran ?

f0=(3.4GHz+3.6GHz)/2=3.5GHz
BW=0.2GHz, BW/3=0.0666GHz
I choose delta_f=50MHz < BW/3

(1) standard case
f1=f0-delta_f/2
f2=f0+delta_f/2

(2) allevitated case
f2=f0-delta_f
f1=f2-delta_f

or

f1=f0+delta_f
f2=f1+delta_f

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8. ## Re: Two tone nonlinear simulation in ADS Originally Posted by pancho_hideboo What analysis do you use ?
HB or Tran ?

f0=(3.4GHz+3.6GHz)/2=3.5GHz
BW=0.2GHz, BW/3=0.0666GHz
I choose delta_f=50MHz < BW/3

(1) standard case
f1=f0-delta_f/2
f2=f0+delta_f/2

(2) allevitated case
f2=f0-delta_f
f1=f2-delta_f

or

f1=f0+delta_f
f2=f1+delta_f
Analysis HB
In this case, Is it f-spacing is 50 MHz?  Reply With Quote

9. ## Re: Two tone nonlinear simulation in ADS Originally Posted by Mabrok In this case, Is it f-spacing is 50 MHz?
Yes for standard case.
If you have an interest about IM5 in addition to IM3, you have to reduce delta_f.

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10. ## Re: Two tone nonlinear simulation in ADS Originally Posted by pancho_hideboo Yes for standard case.
If you have an interest about IM5, you have to reduce delta_f.
I also want to ask if you have an idea about ACPR or ACLR? Can we simulate one of these parameters using HB simulation in ADS? Thanks  Reply With Quote

11. ## Re: Two tone nonlinear simulation in ADS

You have to apply modulated signal for evaluation of ACLR, use envelope analysis which is time variable HB.

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12. ## Re: Two tone nonlinear simulation in ADS Originally Posted by pancho_hideboo You have to apply modulated signal for evaluation if ACLR, use envelope analysis which is time variable HB.
Thanks alot. do you have any documented guide show how to properly use envelope analysis to obtain ACLR for power amplifier?  Reply With Quote

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13. ## Re: Two tone nonlinear simulation in ADS  Reply With Quote

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