The Designer's Guide Community Forum

Mayank Community Fellow Offline Posts: 320	Linearity Sims Jun 21^st, 2010, 9:18pm Hello, If i want to check the linearity of my opamp, how do i determine what sims of the following or otherwise should i conduct ?? THD / Rapid IP3 / IM3 / IM2 / IM5 ??
Back to top	IP Logged

pancho_hideboo

Senior Fellow

Offline

Posts: 1356
Real Homeless

Re: Linearity Sims
Reply #1 - Jun 24^th, 2010, 5:52am

Mayank wrote on Jun 21^st, 2010, 9:18pm:

If i want to check the linearity of my opamp, how do i determine what sims of the following or otherwise should i conduct ??

It depends on application of OPAmp.

But THD and IP3 are enough for metrics of linearity generally, although I don't know what you mean by "Rapid IP3".

IP2(IM2) have various type. On the other hand IP3(IM3) definition is unique.
What type of IP2(IM2) do you intend to evaluate ?
See http://www.designers-guide.org/Forum/YaBB.pl?num=1262010975/1#1

Also see http://www.designers-guide.org/Forum/YaBB.pl?num=1264434513/1#1

Back to top

« Last Edit: Jun 25^th, 2010, 4:44am by pancho_hideboo »

Kita━━━━━━(ﾟ∀ﾟ)━━━━━━ !!!!!
http://www7.plala.or.jp/ungeromeppa/flash/kita.html
http://www.youtube.com/watch?v=mjIxGh55bMM&feature=related

IP Logged

sheldon

Community Fellow

Offline

Posts: 485

Re: Linearity Sims
Reply #2 - Jun 24^th, 2010, 7:48am

Mayank,

If you mean Spectre RF Rapid IP3 analysis then it is really a
analysis rather than a measurement. It is probably better used
as a tool to
1) Debug where there is distortion in the design, along with the
distortion summary
2) Identify the "worst-case" corners to investigate when you have a
lot of corner conditions. Or the Monte Carlo seeds[runs] to
investigate

I would probably add Spurious Free Dynamic Range to the list of
measurements, if the target application is for data converters. One
other thing to consider for your list is test frequencies, loads, etc.
to be used for characterization.

Best Regards,

Sheldon

Back to top

IP Logged