creating current pulse generator

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patricky

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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.
 

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.
 

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.
 

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    patricky

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

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

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