creating current pulse generator

[patricky]

is there a way to create a current pulse generator. is it possible on-chip?
For example, I would like to try to create a very short pulse (~ 1-10ns) with a small amplitude (1-1000 nA) injected every 1ms. Any suggestions would be great.

 

[dick_freebird]

The trick will be, getting a pulse that small and short to show
up with anything like its original / intended form at the
destination.

But switched current sources, yes, they're common enough.
You probably want to think about "steering" rather than
"switching", at that kind of speed.

 

[FvM]

For a serious discussion, the acceptable output impedance (capacitance & conductance) and required voltage compliance
should be specified. Also if a DC bias current can be allowed to for the source.

 

[patricky]

I would like to drive a high impedance node: 50MOhm, 1pF (might be tough). A tolerance <= 0.6V will be sufficient.

 

[patricky]

oh, and i would prefer w/o DC bias current (or at least programmable). If not, that is fine.