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Three tones IIP3 simulation

EiRFIC

Hi All,

I saw the cadence tutorial on measuring IIP3 with 3 tones test (Lets say I have a mixer in the test so two tones are entered in the RF port and one is the LO).

Now, I would like to verify if my receiver meets the bluetooth standard. In the standard it says to enter a signal at -64dBm and two additional signals (interference) 

at -39dBm each which placed one k (lets say k equals to one for the example) channels apart and the other 2k channels apart (so 3 signals enter the RF port). These signals cause an intermodulation product to fall

at the frequency of the desired signal. I would like to measure the IIP3 in this case. 

Now, I need to enter 4 tones and the IIP3 is measured (based on cadence tutorial) using sweep in the hb.

I do not want to sweep power since I need to enter exact power. I tried to use multi sinusoidal option in the port with exact power but it does not work.

How in general am I be able to check communication standard in this way using virtuoso and measure IIP3?

Can someone please help me?

Thanks in advance! 

  • Hi Eric,   

    • Which tutorial?  Please post the exact name or give the link.   
    • Why do you want to use three large tones?  If this is not a large signal IP3 (like a transmit mixer), you can use rapidIP3 which is a LOT faster.     
    • What specifically are you simulating?   
    • If you are trying to look at Wireless Communication standards, you may want to look at our Wireless workshop:  SpectreRF APS Workshop for Wireless Simulation
    • Please check out SpectreRF AppNotes and Tutorials - One of our best kept secrets! (Dec 30 2019)

    Article (20463330)
    Title: SpectreRF AppNotes and Tutorials - One of our best kept secrets!
    URL: https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000007MVj5EAG&pageName=ArticleContent

    best regards,

    Tawna

  • in reply to Tawna

    Hi Tawna,

    1. I am talking about the mixer tutorial (do not have a link).

    2 and 3. I explained that I am trying to simulate IIP3 of a receiver to see if it meets the bluetooth standard (but not 3 tones test but actually 4). I mentioned it in my question (if something is not clear please let me know 

    and I will rephrase it). 

    4. Cadence Wireless Communication Standards do not help. They do not deal with what I am looking.

    Thanks 

  • in reply to EiRFIC

    Hi Eric,

    I'm really sorry I don't have time to delve into this.  (I have my day job that is extremely busy right now).  I suggest that you file a Case with Customer Support (https://support.cadence.com ).  That way, an AE can look at this right away for you.   I've not done a "4 tone IP3" measurement.  Since this is a receiver and not a transmitter, I'd be inclined to look at hbac/rapidIP3, rather than a 3 (or 4) large tone hb.

    Things that will help the AE are:  software version you are using (spectre and virtuoso), the 4 frequencies in the circuit, that this is a receiver.   Also if you have a technical paper describing the 4 tone measurement, that would be extremely helpful.  I admit - I could be suffering from a "severe lack of caffeine" and simply missing the obvious here.

    best regards,

    Tawna

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