• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 48 subscribers
  • Views 229 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

INA188: INA Saturation without the I Bias return path

Eric Liu(SZ-FAE)
Intellectual 1590 points
Part Number: INA188

Hi team，

I want ask a question  about the INA I bias return path, cause you know， we always suggest to provide a receive path for the I Bias to avoid it into a saturation, so I want to ask ,if we use a non-inverter amplifier circuit with the same configuration, it means just like this .does the below circuit  will go to saturation? the stray capacitor stands for the capacitor if the IN+ pin & the parasitic capacitor of the PCB . if  so, why we didn't see saturation in practical application 

  • 0
    Guru 297270 points

    When the input is connected only to a capacitor, then you do not know what voltage it has. And it indeed can float to an out-of-range value.

    Why is there a capacitor in the first place? What is the purpose of this circuit?

  • 0
    TI__Mastermind 23965 points

    Hey Eric, 

    As Clemens pointed out the example you provided shows the non inverting node floating at DC. This will not work because the amplifier is not properly DC biased. I see the title is for the INA188. Can you provide a complete schematic for the INA188?

    Best Regards, 

    Chris Featherstone