TINA/Spice/LM833: Difference in simulate btw Webench and TINA

Alone173

Part Number: LM833
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hi everybody
I try to simulate this circuit with LM833 opamp in TINA tools and Webench
But I received differrent results
With input signal from +/-2V
Output signal limit in range from 0 ->1.8V
So in Webench show the result which i expect, and TINA show another results
maybe i have a wrong in TINA tools when config?
Please help me to solve this issue
Thanks.

TINA file

LM833.TSC

over 6 years ago

0 Alone173 over 6 years ago

Expert 1225 points

0 JC Zhu over 6 years ago in reply to Alone173

TI__Mastermind 29035 points

NTC,

You are using a 45.1kOhm total resistor ladder to generate your bias voltage. The current through that is only 73nA. Note that there's a 300nA bias current on the input pins of the LM833. In the end, you don't get the 0.621V bias as in the WEBENCH schematic.

Change that to a voltage source and you should see the simulation result match WEBENCH.

-JC

0 JC Zhu over 6 years ago in reply to JC Zhu

TI__Mastermind 29035 points

HTC,

My calculation was off. Your resistor ladder is fine. The actual reason is that you had a typo in the circuit. The jumper above that resistor ladder is "+3V3" instead of "3V3" which is connected to the voltage source, hence the resistor ladder is unbiased.

Regards,
JC

0 Alone173 over 6 years ago in reply to JC Zhu

Expert 1225 points

Hi
i fixed this issue.
Can you give me more for optimized this circuit when make a real circuit
Thanks

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TINA/Spice/LM833: Difference in simulate btw Webench and TINA