Hi,
I am doing some simulation with MAPS sensor, in which I should extract Global time from pixel hits,
but my timing performance behaves in the inverse way from my measurement. The spread of the TOA distribution increases as the threshold rises, like this:
TimeOfArrival.pdf (13.4 KB)
TimeOfArrival.pdf (13.4 KB)
the top one is for threshold of 2000 electrons and bottom one for 1000 electrons.
The measurement goes decrease with higher threshold, as higher threshold rejected lower pulse at the pixel edge, and only high pulse in the pixel center accepted and contribute to less spread (I assume).
I am using the [CSADigitizer] model with configuration of:
[CSADigitizer]
model = “simple”
feedback_capacitance = 5e-15C/V
rise_time_constant = 25ns
feedback_time_constant = 65ns
ignore_polarity = true
output_plots = false
name = “dut”
threshold = 31.7mV
Have anyone got this ever, or help to explain it? Many thanks in advance!