Need help to solve analog circuit overshoot problem.

[EDA_hg81]

Ideal is the following:

1. Use current source ( 0.1mA ) to charge a capacitor.
2. After disconnecting the current source, measuring the flowing current from that capacitor.

I want to use an analog buffer to deal with the potential overshoot, but the requirement of this transmission line is that the leaking current produced by the analog buffer can not be higher than 0.001mA.


Can I realize my idea?

Thank you.

 

[Kral]

EDA_hg81,
Almost any run-of-the-mill Op Amp can do this, as long as it's used in the non-inverting configuration. The leakage current will be, at most, the Op Amp bias current plus the Op Amp p0ffset current.
Regards,
Kral

 

[EDA_hg81]

Do you know how to realized bidriectional analog buffer?

No MOS switch can be included.

thank you

 

[movingbait]

You can use a relay

OR just a fet by itself, like a jfet which is symetrical.

movingbait. Ü