TINA/Spice/OPA627: OPA627

Jubayer Jalil

Prodigy 200 points

Part Number: OPA627
Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

Hi,

I have attached a doc file of a circuit where Fig 1 cannot simulate in TINA noise analysis whereas Fig 2 can.

Can you please help me to sort it out?

Thanks in advance.

regards

Jubayer

7384.Doc3.docx

over 5 years ago

0 JC Zhu over 5 years ago

TI__Mastermind 29035 points

Jubayer,

Thanks for sharing your schematic. Do you mind uploading the tsc file directly so we can save some time draw it up?

Thanks,
JC

0 Jubayer Jalil over 5 years ago in reply to JC Zhu

Prodigy 200 points

2630.1411.6470.Inverting mode.TSC

Dear Mr. JC

The TSC file has been attached.

Kind regards

Jubayer

0 JC Zhu over 5 years ago in reply to Jubayer Jalil

TI__Mastermind 29035 points

Jubayer,

What is the version of TINA you use?

Thanks,
JC

0 Jubayer Jalil over 5 years ago in reply to JC Zhu

Prodigy 200 points

Version 11.1.0.124 SV-DS

0 Jubayer Jalil over 5 years ago in reply to Jubayer Jalil

Prodigy 200 points

Hi,
Is this a version problem?
Thanks

0 John Miller - Sensing over 5 years ago in reply to Jubayer Jalil

TI__Mastermind 33230 points

Jubayer,
Unfortunately, the TINA circuit you attached to this thread would not open.

The most likely cause of the error is no DC path to ground at the node formed by the common connection of the input capacitors.

Try attaching a large resistor from this node to ground and re-run the sim. I'm guessing the error will not re-appear.

Alternatively, you can adjust TINA's minimum shunt conductance to ground. Select Analysis/Set Analysis Parameters, and a two-column table should appear with a long list of parameter names and their default values. Scroll to the bottom of the table and the fourth line from the bottom should be Shunt Conductance (S), with a default value of zero. Change this to something non-zero, but still small, like 1p or 1n, and re-run the sim. The error should not re-appear.

Regards,
John

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TINA/Spice/OPA627: OPA627