Problem in IP3 simulation of an entire receiver in cadence virtuoso

[EhsanHamzei]

Hello All
I have designed a receiver but I cannot simulate its IIp3 in spectreRF.
I searched a lot but all the tutorials consider a term for the LO but I have a real oscillator in my receiver.
therefore I cannot use them.
I would be thankful if anyone could help me.
thanks

 

[pancho_hideboo]

Use semi-autonomous HB-QPSS Analysis.

I recommend two-Large-tones and one-small-signal using QPSS/QPAC.
One Large Tone(Autonomous Signal) : Oscillator
The other Large Tone(Drive Signal) : RF input
One Small Signal : RF input

Or do autonomous-PSS for Oscillator alone.

See https://www.edaboard.com/showthread.php?106681#5

 

[EhsanHamzei]

Thanks for your reply.
YES,I have seen some tutorials and as you said I should use Qpss and Qpac.
but respectfully, your answer is not clear to me.
let me explain it better.
my active mixer is stacked on top of LNA (in a current reuse manner) and the output of VCO is applied to the gate of mixers to switch them.
I have also one port that is input and is matched to 50 ohm.(I used hbac for conversion gain and hbnoise for noise figure and the results are true)
would you please tell me in detail what to do?
how should I apply two large tone? what about VCO? how should I consider VCO large output in QPSS?
thanks a lot.

 

[pancho_hideboo]

Can you understand Semi-Autonomous HB-QPSS ?

 

[EhsanHamzei]

thx for your kind reply.
NO, I don't know.
I am going to search it right now

 

[pancho_hideboo]

https://www.designers-guide.org/Forum/YaBB.pl?num=1227668750/4#4

I don't believe Multitone-HB analysis of Cadence Spectre at all.
Especially, semi-autunomous HB of Cadence Spectre is very suspicious.

Semi-autunomous HB was introduced 10 years ago in Cadence Spectre.
However I don't think there are people who utilize and believe it even now.

https://www.designers-guide.org/Forum/YaBB.pl?num=1239497657/1#1