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N-Path Filter IIP3

Hi everyone,
I am trying to design an N-Path Filter with fLO=1GHz
But i dont know how to simulate the IIP3 of N-Path Filter on cadence spectre.
Can you give me some guide.
Thank you

Andrew Beckett over 2 years ago

I'm not that familiar with N-Path filters, but I don't really see why it would be particularly different from measuring the IIP3 with any other circuit (it's like a mixer, except presumably the input and output frequencies are the same). So you should be able to use a 3-tone harmonic balance, or a 1-tone harmonic balance with Rapid IP3 (or a 1-tone shooting PSS with Rapid IP3).

Andrew
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ThaoCao over 2 years ago in reply to Andrew Beckett

Thank you for replying me.

I think it quite similar to simulating IIP3 of mixer but i haven't simulate IIP3 of mixer yet.

I have search on google and find the method of 2-tones measurement: if the center frequency of 1 GHz , we will put two tones of 1.1GHz and 0.9GHz at the input, for example.

Then I use PSS to simulation but I dont know how to put two tone at the input.

Another problem that when plot pac result, there is a parameter of input power extrapolation point (dBm), i dont know what does it mean and how to choose its value.

Thank you.
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Tawna over 2 years ago in reply to ThaoCao
There are workshops in the software hierarchy that will help you set up an IP3 measurement. For those with access to https://support.cadence.com, here is the Article: SpectreRF Application Notes and Tutorials - One of our best kept secrets!

RF Documentation Workshop and Database:

Documentation can be found here: Spectre Circuit Simulator and Accelerated Parallel Simulator RF Analysis in ADE Explorer Workshop . This is also in the documentation in the Virtuoso hierarchy. The path will look something like this:

<IC618 or ICADVM20.1>/lnx86/64/doc/spectreRFexplorerWorkshop/spectreRFexplorerWorkshop.pdf

Workshop database is located here: <SPECTRE21.1>/tools.lnx86/spectre/examples/Legacy/RF_Doc_Database.tar.gz

These are great tutorials - they explain the "why" as well as the "how".

best regards,

Tawna
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wgtkano over 2 years ago in reply to Tawna

How can we download these example testbenches provided in the Simulator RF Analysis in ADE Explorer Workshop ?

Thanks
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Tawna over 2 years ago in reply to wgtkano

Hi Wgtkano,

You find them in the Spectre and Virtuoso hierarchy. Go to your linux workstation.

"cd" to the paths that I specified above.

You will need to gunzip and untar the RF_Doc_Database.tar.gz

This is also documented in the Article SpectreRF Application Notes and Tutorials - One of our best kept secrets!

best regards,

Tawna
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N-Path Filter IIP3

RF Documentation Workshop and Database:

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