I have a voltage doubler charge pump that is used to provide voltage over an IR LED for a short pulse, I also have a driver circuit for the LED to sink the right amount of current that I am requiring. Individually, these two circuits work fine, with no load over the charge pump, there is a nice pulse up to double the input voltage (which could be anywhere from 2-3VDC), and with a constant supply over the LED driver, it sinks the right amount of current as I am expecting. Below is a circuit diagram of what I am talking about to make it more clear:
On the right is the charge pump and on the left is the driver.
Now this circuit does kind of work for a 3V input, ie. gives out the current I am looking for ~150uA, but there is no spike in voltage over the LED that I can see on a scope where there should be. I believe the problem lies within the Charge pump side of things as the driver does give the right current given the proper voltage over the LED. The thing is, I am running out of ideas as to how to get it to work with a voltage as low as 2V ao if anyone has any ideas, that would be great!
It is probably very worth noting that the +2VDC I have put going into the transistor bases, is in fact a pulsed signal rather than a constant 2V supply, sorry for any confusion.