Error "could not resolve the question of Convergence.

Hello

I work with the Multisim13 and I when I am trying to implement the design attached shows a window saying ""failed to resolve the issue of Convergence"as shown in attachment."

I found similar topics here

http://forums.NI.com/T5/circuit-design-suite-Multisim/how-to-solve-simulation-error/m-p/838043/highl...

http://forums.NI.com/T5/circuit-design-suite-Multisim/problem-with-simulation/TD-p/2603281/highlight...

BTU were not up to the solution to this.

Thank you.

According to the OPA381 data sheet, it is designed to work with capacitive loads up to 100 pF, by inverting the configurations of the amplifier and as an amplifier to transimpedance, which is usually used with a current input (very low) and comments fairly large resistances.  Your circuit works with capacitive loads of ~ 5 uF (50000 x the design load), unity gain, setting up inverted, and with an input voltage.  Depending on how the model for the OPA381 manages these outside normal range values, convergence errors are not too surprising.

The network of coupling between stages has a low pass cut off ~1.3 Hz. The first entry of the step network is more complicated but also the limits of bandwidth at very low frequencies.

What is this supposed to do?

I faked coupling and feedback networks (assuming ideal unity gain amplifiers). It is the output with a 1 volt of entry.

Lynn

Tags: NI Software

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