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Design Transimpedance, multigain stage

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Azerzen

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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
 

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.
Click to expand...
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".
 

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