Choice of summing amplifier

Hi,

I want to sum a small signal (~0.01-10mV, upto ~5MHz) with a large offset voltage (0-2.5V, < 5kHz), and am looking for good op-amp choices. Obviously low-noise is extremely important, with voltage noise of a few nV/sqrt(Hz) desired.

I've had a couple suggestions from going through other people's spec sheets (AD829, AD8129), but always with a +/- voltage source. Can anyone recommend a good amplifier for this application with a single 5V supply?

Thanks! 

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  • 0
    •  Analog Employees 
    on Sep 12, 2019 11:41 PM

    Hi Jim78674,

    Looking for a single supply (input CM to V-), low noise device for your summing application, I'm thinking LTC6228 (0.88nV/RtHz noise, RR output) is a good choice if you can afford the 16mA supply current?

    LT6202 (RRIO) supply current is 2.8mA but is still low noise at less than 2nV/RtHz.

    Hope these suggestions help.

    Regards,

    Hooman

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  • 0
    •  Analog Employees 
    on Sep 12, 2019 11:41 PM

    Hi Jim78674,

    Looking for a single supply (input CM to V-), low noise device for your summing application, I'm thinking LTC6228 (0.88nV/RtHz noise, RR output) is a good choice if you can afford the 16mA supply current?

    LT6202 (RRIO) supply current is 2.8mA but is still low noise at less than 2nV/RtHz.

    Hope these suggestions help.

    Regards,

    Hooman

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