Dear friends,
I was given the task to design the amplifier for the signal from photomultiplier. I need to detect 1 uA amplitude, 6 us long current pulses of gaussian shape, on top of the 40uA dark current (due to the ambient light, that I cannot get rid of at the moment) and the output needs to be in range +/- 5V.
The requirements sets the gain to 50 V/mA. I used the topology of transimpedance amplifier (see attached schematics). Unfortunately my design still suffer from high noise.
Could you help me to improve the design to minimize the noise?
I am using Multisim to simulate the behavior of my design, but I am completely new to it. Could you recommend me, how could I simulate such a noise as I have in it, to investigate the ways how to reduce it?
Best regards,
Micard