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Product Selection Help

Justin Gruetzner
Prodigy 10 points


I am in need of a differential amplifier with a gain of 100dB, with an input impedance on the order of 10 MegaOhms for use in instrumentation.  I will need to cut out frequencies above 2KHz, however I can externally compensate for this if need be.  The power supply available is +/- 12 V.

Does anyone have any product recommendations that would be a good starting point?

  • 0
    Prodigy 10 points

    I am looking for a differential amplifier with a midband gain of 100dB, an input impedance of atleast 100MegaOhms and an output impedance of less than 50Ohms. I will be using +/- 12V power supply. Does anyone have suggestions?

    Thank you

  • 0 in reply to Erika Herge
    TI__Mastermind 25865 points

    Hello Erika and Justin,

    I have merged these threads for they appear to have very similar requirements and arrived within 2 minutes of each other. Both posts require a gain of 100dB, high input-impedance, and supply voltages of +/-12V. One post requests an output impedance of less than 50ohms and the other requests a low-pass filter of 2kHz. If my assumption is incorrect, I still think it's wise to keep both of these questions in the same thread for they are very similar. I can always split the threads later if need be.

    Moving forward, please answer the following questions. The answers will help us understand your system in further detail.

    1) What is the application?

    2) What is the common-mode voltage?

    3) Are there any other supplies available (e.g. 5V)?

    4) Can you please describe the input signal in further detail (magnitude, frequency, and impedance)?  What does the input signal represent?  What is the sensor?

    5) What is the output requirement (e.g. 0-5V)?