Diode
- reverse bias?
- input is “dark current”
- from thermal excitation on the diode
- constnat input
- problem occurs if this baseline is too large bc you lose dynamic range on the op amps 0-3.3V range
Op-Amp
- scintillation preamplifier?
- not a standard config (noninverting, differentiator, integrator)
- 0-3.3V range
Capacitor
-
capacitance controls sensitivity
- smaller capacitance = less sensitive
- larger capacitance = more sensitive (includes more of the baseline signal)
Resistor
- resistance controls baseline
- resistance proportional to baseline