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  1. #1
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    Design Transimpedance, multigain stage

    Hi,

    I am currently trying to design a transimpedance with multigain stage using analog switches.

    The board must be able to perform measurement between 6mA to 6nA with a bandwidth up to 20MHz. I know that it's impossible to have 20MHz on the 5 gain but at least on the 10^3/10^4/10^5.

    The main problem is that the parasitic capacitance Cds of the switch decreases a lot the overall bandwitdh.

    Do anybody have an idea about how design such a project?

    Best Regards,

    Azerzen

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  2. #2
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    Re: Design Transimpedance, multigain stage

    Hi,

    you mean transimpedance amplifier?

    What supply voltage?
    What output voltage range?
    What load current / load_impedance?

    What output_voltage/input_current ratio(s) do you whish? (in V/uA)

    A sketch about your idea (even hand drawn) may help.

    Klaus

    In the other (deleted) post you talk about:
    6mA to 600nA so 5 decades.
    Very confusing:
    * 600nA to 6mA is 4 decades
    * but 6nA to 6mA (mentioned here in post#1) is 6 decades
    --> please clarify.

    But avoid to give every post a new/modified requirement. Please first decide: What do you need "at least" and what do you like as "nice to have".
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.



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