Are there application notes/schematics showing the AD8000's configured as an instrumentation amplifier?

Hello,


I need to build an ultra-high speed instrumentation amplifier for an ultra-wideband radar I am building.  Are there application notes or schematics to use the AD8000, AD8003, or the AD8009 configured as an instrumentation amp? I need an instrumentation amplifier that can handle frequencies up to 1.5 GHz.


Thank you,

Kyle Ogden

  • 0
    •  Analog Employees 
    on Oct 23, 2013 11:39 AM

    Hi Kyle,

    Unfortunately I cannot provide you with the circuit that you're asking for. If you are looking for an in amp usable up to 1.5GHz, the discrete op amps used to build it will need to have much higher specifications than the AD8000. The only circuit I came up with uses the ADA4817 and the ADA4830, and can only go to 3.5MHz at a gain of 5, which is a long ways away from what you require.

    What will you be using the instrumentation amplifier for? Perhaps I can find another part which can give you the functionality that you need.

    Thanks,

    Kris

  • Hi Kris,

    I'm building a UWB radar and trying to configure it for target feature extraction of electrical characteristics. I'd like to see if I can detect the radar cross section of backscatter modulation devices, RFID tags, electronics, etc.

    This is the radar: http://www.mikrocontroller.net/attachment/27468/osee.pdf

    This is the amplifier I want to replace:

    Thanks,

    Kyle Ogden

  • Hi Kris,

    excuse me if this is a duplicate message. The last message seems to have disappeared.

    I'm building a UWB radar and I'd like to configure it to detect backscatter modulation devices, RFID tags, etc, by their radar cross section. These devices work in the microwave part of the spectrum below 1.5 GHz.

    Here is the radar: http://www.mikrocontroller.net/attachment/27468/osee.pdf

    Thanks,

    Kyle

  • 0
    •  Analog Employees 
    on Oct 24, 2013 2:27 PM

    Hi Kyle,

    Thank you for including the reference for the circuit you're doing, it helps out a lot.

    The good thing to note about the receiver is that the received signal actually goes through some averaging before going into the instrumentation amplifier. The signal out of the fast sampler (as it's called in the reference) will be of low frequency, so this greatly relaxes the bandwidth requirement of the in amp you will be using. Other than this, it looks like the main function of the in amp will be to reject common mode noise and perform differential to single-ended conversion. This in mind, the AD8421 would be a good candidate for your circuit.

    I hope this helps!

    Kris

  • Kris,

    Terrific!  I'll use the AD8421 for the in-amp the specs on the data sheet look good. It's a good fit. 

    Thank you for your help.

    Kyle