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Part Number: OPA1611
Tool/software: TINA-TI or Spice Models
The result of an open loop analysis which is simulated with TINA-TI using the following schematic is shown, it seems that the phase margin isn't enough.So, does the TINA-TI simulation model for OPA1611 support an open loop analysis ?Please let me know if there is an error in the simulation method.
TIPD118 Verified Design Reference Guidehttp://www.ti.com/lit/ug/slau518/slau518.pdf
Band pass filtered inverting attenuator circuithttp://www.ti.com/lit/an/sboa213a/sboa213a.pdf
I would do it this way:
I would remove C4 and R7:
See also this link:
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Precision Amplifier Applications - TI Tucson
In reply to Alexander Davis:
Hi Kai-san and Alexander-san,
Thank you for the explanation.
As you pointed out, the open loop wasn't formed correctly and the probing point was also wrong, so I will review it and try to simulate it again.
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