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Amplifying a specific range of current

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GuyGor

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Hello , I have an output with current range from -20nA to 300nA and I want to use some device or modoul that can pass to an amplifying circuit just the currets between 10nA to 250nA without passing any current that is above or below that range.
Any ideas/suggestions?
TNX
 

without passing any current that is above or below that range
Click to expand...
Means exactly what?
- Saturating output to range limits?
- Returning zero? (Hint: causes ambiguity)
 

Hi,

This is an unusual task.
Can you explain a bit more about your application?

**
It´s hard to amplify currents precisely.
It´s more common to amplify voltage.

Amplify means "gain". What gain are you thinking of?

What exactely should happen outside the range?
"Not amplifying" means gain = zero = zero output current .. like switching OFF. Or do you want it to limit to 10nA and 250nA respectively?

Klaus

- - - Updated - - -

I was too slow... ;-)
 

I don't know if it is possible but maybe returning negetive value . The idea is not to amplify data I don't need. Is it even possible?
 

The idea is not to amplify data I don't need.
Click to expand...
Why particularly?
I think you should think about your requirements first to start a meaningful discussion.

Any technical amplifier has a finite output voltage or current range. Usually you don't design it larger than necessary. In special cases, you'll implement a precise clamping means, e.g. to avoid overload of the succeeding circuit. Clamping accuracy and characteristic will be chosen according to application requirements.

Referring to your question, are there serious reasons to implement precise output clamping beyond standard amplifier saturation? If so, what are the detail requirements?
 

I'm not sure I have the knowledge to answer this but the device giving the current is a sensor for inner body applications so the reason to define a certain value is that this value is an event that I want to amplify and all the rest is noise or current that I want to ignore.

Hope I explained it right.

- - - Updated - - -

Hey Kluse, it is something for my studies that simulate an inner body sensor that has an output current in a wide nano amper range and I need to take just a specific range and to amplify it ignoring all the rest.
Hope I explained it well. Is there such thing like a railroad switch for currents.
The amplification will be for voltage but first I need the right data.
 

Hi,

My recommendation:

Transform the current into voltage. Limit the value to your desired range
Then use an ADC to convert it to digital.
Now you may use software to decide what values are valid and what values are not.
And you may process the valid data as you like.

I think it's easier to "adjust" software than to adjust hardware amplifiers, limits.. and so on.

Maybe you should first specify your signals and do some simulations.

*****
Btw: noise is not DC nor a specific frequency. It is random. So it's about impossible to eliminate it.
You may attenuate all unwanted, unnecessary frequencies and this way improving signal quality.
You may use fourier analysis or correlation to find the signals of desire.

Klaus
 
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    GuyGor

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thanks a lot , it seems the best way. I am new here so did not understand how to give you points :)
 

by the way what did you mean in your massage when you wrote "tk"?
 

Hi,

by the way what did you mean in your massage when you wrote "tk"?
Click to expand...
Sorry. A typo. I corrected it:
Limit the value to your desired range.

Klaus
 

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