sinnadyr
Member level 2
Hi there!
The posted circuit is a low noise charge amplifer and a shaping filter for measuring very tiny pulses appearing on the input of the charge amplifier. The first oscilloscope image is from our PSU bias voltage, and as you can see it is very clean (had some problems but this post fixed it. The second image is on the output of the charge and shaping amplifier, and we get this wierd periodic flickering. Does anyone have any idea where this might be coming from?
Any help would be very appreciated! Thank you!