Post Go back to editing

High Input Impedance op amp

Dear all,

I am measuring the resistance of a large resistor (up to several Mohms) using 4-wire terminal. The resistance is so large that it surpasses the input impedance of my voltmeter (100MOhm). So I am looking for an differential operational amplifier that offers a large input impedance (>2GOhm), that could take input spans several microvolts up to 0.5 volt.

Could you offer me some products that fits into our application?

Parents
  • Hi Qian,

    Apologies for the delay of response. We have a lot of amplifiers that has a very large input impedance in our portfolio. To see this, you can go to this link - click the choose parameter and Enable the (Rin  Typical) on the filter options by checking the box. You can also arrange the amplifiers from highest to lowest Rin by clicking the arrows beside the Rin parameter.

    These are the amplifiers that you may want to consider are ADA4505, AD8661 or AD8603.

    Let me know if you need anything else.

    Best regards,

    Emman

Reply
  • Hi Qian,

    Apologies for the delay of response. We have a lot of amplifiers that has a very large input impedance in our portfolio. To see this, you can go to this link - click the choose parameter and Enable the (Rin  Typical) on the filter options by checking the box. You can also arrange the amplifiers from highest to lowest Rin by clicking the arrows beside the Rin parameter.

    These are the amplifiers that you may want to consider are ADA4505, AD8661 or AD8603.

    Let me know if you need anything else.

    Best regards,

    Emman

Children
No Data