OPA2704: Spice Modeling Question about OPA2704

Osamu Uchino

Prodigy 50 points

Part Number: OPA2704

Dose OPA2704 PSpice Model support noise Simulation ?

over 4 years ago

0 Michael Steffes over 4 years ago

Guru 48395 points

Well Osamu-san,

Being a CMOS input, current noise is very low and probably not important in most apps, The datasheet says 2.5fA/rootHz - the model is not showing that, but probably not a problem,

The more important one is voltage noise,going to gain of 1 with no resistors to add noise and looking at the output, way too high, so yes it is there, but erroneo

0 kai klaas69 over 4 years ago in reply to Michael Steffes

Guru 140200 points

Hi Michael,

looks pretty much perfect to me:

osamu_opa2704.TSC

Kai

0 Caro Walter over 4 years ago

TI__Mastermind 20192 points

Hello Uchino-san,

I opened the netlist and it says that the following noise features are modeled:

* INPUT VOLTAGE NOISE W 1/F
* INPUT CURRENT NOISE W F^2

The PSpice User's Guide has a step-by-step on how to do PSpice Noise Analysis starting on Page 351: https://www.seas.upenn.edu/~jan/spice/PSpice_UserguideOrCAD.pdf

All the best,
Carolina

0 Michael Steffes over 4 years ago in reply to kai klaas69

Guru 48395 points

Yep, for some reason I was looking at the spec line of 45nV and reading that as 4.5nV

0 Osamu Uchino over 4 years ago

Prodigy 50 points

ALL,
I appreciate many support.
We try noise simulation.

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Amplifiers forum

OPA2704: Spice Modeling Question about OPA2704