Stats

Locked Locked
Replies 4
Subscribers 64
Views 8081
Members are here 0

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

IP3 of Mixer

Hi everyone,

1) I am trying to measure the IP3 of a mixer that mixes a sin wave with a pulse wave. So can i use PSS + PAC to measure IP3 of this circuit or I have to use QPSS+QPAC.

2) If I have to use QPSS + QPAC, how can I fix the error QPSS did not convergence

Thank you.

Andrew Beckett over 2 years ago

That's really not enough information to go on. You didn't say how you'd set anything up, exactly how it was failing to converge, which version you're using, and so on. Are you using harmonic balance (you probably should for a 3 tone IP3 simulation - I presume the LO is square, and the two RF tones are sinusoidal). I doubt shooting QPSS would be a good fit - but without more data it's very hard to advise.

Andrew
Cancel
Vote Up 0 Vote Down

Cancel
ThaoCao over 2 years ago in reply to Andrew Beckett

Thank you Andrew,

This is my circuit.

It include 4 switches which are controlled by 4 pulse waves : s1, s2, s3, s4 and these pulse waves are divided from a main pulse source.
Cancel
Vote Up 0 Vote Down

Cancel
ThaoCao over 2 years ago in reply to ThaoCao

About the setup of QPSS:

I setup the frequency of pulse source is fLO, the first tone of input frequency is Frf, the power of input tone is prf.

Then when I simulate, the output log show that QPSS is nonconvergence
Cancel
Vote Up 0 Vote Down

Cancel
ShawnLogan over 2 years ago in reply to ThaoCao

Dear ThaoCao,

Did you happen to read through this recent Forum post that poses an almost identical question? There is a link outlining when the use of QPSS and PSS are warranted and some resources for better understanding appropriate simulator settings.

https://community.cadence.com/cadence_technology_forums/f/rf-design/55609/iip3-calculation-of-n-path-n-4-mixer

Shawn
Cancel
Vote Up 0 Vote Down

Cancel

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.