Need to separate wide Bandwidth AC signal from DC power signal using AMP

Hi,

I have differential signal on two line (bandwidth of 1 GHz)  , which has DC offset of ~ 50 to 60 V. 

actual signal has Peak to Peak ~ 1.5 V. This signal is been mixed with Power supply of  ~ 50 to 60 V.

Looking for Differential Amplifiers or Instrumentation Amplifiers, which can be used to block common dc and get AC signal ( multiple frequency mixture).

If some can provide the part number and demo to my office will be great. 

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  • 0
    •  Analog Employees 
    on Jan 20, 2020 11:05 PM

    Hi Jatin,

    I assume that you cannot (corrected 1/20/20) use an AC coupling capacitor to block the large DC offset and just get the AC across? Presumably because DC information is included in the signal?

    Depending on how much CM rejection you need, here are some options:

    1. You may be able to use a HV Op Amp to do the Differential to single ended conversion for you? Example LTC6091, or ADA4700-1.

    2. Use an over-the-top device like LT6015 to do the differential to single ended conversion:

    3. Use a HV difference amplifier like LT1990.

    There may be other options that I've not though of.

    Regards,
    Hooman

Reply
  • 0
    •  Analog Employees 
    on Jan 20, 2020 11:05 PM

    Hi Jatin,

    I assume that you cannot (corrected 1/20/20) use an AC coupling capacitor to block the large DC offset and just get the AC across? Presumably because DC information is included in the signal?

    Depending on how much CM rejection you need, here are some options:

    1. You may be able to use a HV Op Amp to do the Differential to single ended conversion for you? Example LTC6091, or ADA4700-1.

    2. Use an over-the-top device like LT6015 to do the differential to single ended conversion:

    3. Use a HV difference amplifier like LT1990.

    There may be other options that I've not though of.

    Regards,
    Hooman

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