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lock-in amplifier using AD630 or ADA2200.

thomasnappez
on Jul 25, 2017

Hello,

I want to built a lock-in amplifier with a LO frequency below 5kHz. I am little confused about the choice between AD630 and ADA2200. The performance is the main concern in my application (not the power consumption nor the price). How can I choose the best part: what are the main specifications to look at? And what would be better as a preamplifier: a low noise transimpedance amplifier (such as AD8067, ...) or an input amplifier (such as ADA8429, ...)?

Thank you very much for your answer.

Thomas

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    •  Analog Employees 
    on Dec 2, 2019 2:00 PM

    Hello Thomas,

    There is a third option that may provide the best performance.  That is the LTC6943. If you look on page 10, there is a schematic for a lock-in amplifier.  This circuit may perform the other 2.  It is hard to say.  One key metric of performance for a lock-in amplifier is the integrated noise over its output bandwidth.  But there are other metrics.  They need to be considered in the context of the application.

    Brian

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    •  Analog Employees 
    on Dec 2, 2019 2:00 PM

    Hello Thomas,

    There is a third option that may provide the best performance.  That is the LTC6943. If you look on page 10, there is a schematic for a lock-in amplifier.  This circuit may perform the other 2.  It is hard to say.  One key metric of performance for a lock-in amplifier is the integrated noise over its output bandwidth.  But there are other metrics.  They need to be considered in the context of the application.

    Brian

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