Current splitting in nA,pA range till 100 kHz frequencies

Asked Mar 04 '19 at 16:49

Active Mar 05 '19 at 10:25

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This relates to my previous question of current splitting. Current splitter/divider in nA/pA range possibilities

I read about some circuits on current copying (current conveyor). However, the circuits operate less than around 10 kHz.

But my requirement is to copy currents at a high frequencies (100kHz).

Therefore, I wanted to know if circuit in Current splitter/divider in nA/pA range possibilities 's answer or any current copying circuit would work at high frequencies with a high linearity? or is it something impossible?

edited Mar 05 '19 at 10:25

asked Mar 04 '19 at 16:49

sundar

Who knows what your FET parameters are? Why not simulate it , maybe>? http://tinyurl.com/y6j8uy89 – Tony Stewart EE75 Mar 04 '19 at 18:17
Is this inside an integrated circuit or a board-level design? – Edgar Brown Mar 04 '19 at 21:21
@EdgarBrown This is to be inside an IC. – sundar Mar 04 '19 at 21:55
@SunnyskyguyEE75 Well, simulation is possible with a normal nmos current mirror, but at high frequencies (kHz in this case), there are many parasitic effects, which I hope is not easy to simulate. Last answer by analogsystemsrf revealed that this structure could work till 50 Hz. – sundar Mar 04 '19 at 21:58
Yes I would expect 1/Req*Cstray to be low. f Even though input and output impedances are low. – Tony Stewart EE75 Mar 04 '19 at 22:03
"...would work at high frequencies with a high linearity?" - define 'high'. – Bruce Abbott Mar 04 '19 at 23:20
This kind of sounds like a potential XY question. Would you mind elaborating what exactly the purpose of the current splitter is? (I'm also just curious :) ) – Platytude Mar 05 '19 at 00:53
@Platytude It is for comparing the output of two current sensors. – sundar Mar 05 '19 at 10:27

Current splitting in nA,pA range till 100 kHz frequencies

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