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Differential Amplifier

Prodigy 30 points

Replies: 6

Views: 153


I am Anirudh from GE Healthcare and want some information on Differential amplifier with following constraints:

1) High common mode voltage (Minimum of 100 volts)

2) Good differential Input voltage ( Around 20 volts)

3) Powered from single supply. (Ideally 5 volts)

4) Will be beneficial if it is a dual/quad op-amp.

Please recommend some IC numbers which can fulfill the above constraints. The priority of constraints is in the same manner as listed above.


  • Hello Anirudh,

       I have a few questions before I can recommend you part numbers. Are you attenuating the signal with a resistor divider network? If not, would you be looking for a difference amplifier used as a pseudo differential application or used in a differential application through constraint #4 (dual/quad) rather than a fully differential amplifier. Around what bandwidth would you need for your application?

    Thank you,


  • In reply to SimaJalaleddine:

    Hi Sima,

    Thanks for the reply!

    Yes, I am attenuating my signal through a resistor divider network. Bandwidth is not a concern or a major constraint in our application. The only constraints are the ones mentioned in the trailing description.

  • In reply to Anirudh Iyer:

    Hello Anirudh,

       I have one more question in order for me to help you choose the correct products for your application. For interfacing at the output, would you need a single-ended output or a differential output for the amplifier?

    Thank you!


  • In reply to SimaJalaleddine:

    Hii Sima,

    Thanks for responding once again!

    I'll need a single ended output for the amplifier.

  • In reply to Anirudh Iyer:

    Hello Anirudh,

      Thank you for the information! The product group this question is linked to at the moment is for high bandwidth (GBW>=50MHz) and fully differential amplifiers. I will move this thread to the precision product group. There, they will be able to assist you with finding the correct difference/differential amplifier for your application.

    Thank you,


  • Hello Anirudh,

    I can help you. 

    Take a look at the INA148: http://www.ti.com/lit/ds/symlink/ina148.pdf

    1. Common mode voltage = +/-200V
    2. Good differential input voltgae
    3. Supply is 2.7V to 36V
    4. Single amp