Optimization of FPGA processing of GEM detector signal
2011
This paper presents analysis of processing method of the signal from Gas Electron Multiplier (GEM) detector acquired in
our Field-Programmable Gate Array (FPGA) based readout system. We have found that simple processing of GEM signal
received from the charge amplifier, sampled at 100MHz with 10-bit resolution, after low-pass filtering with 15 MHz cut-off
frequency, provides accuracy similar to obtained by processing of the raw GEM signal sampled at 2.5 GHz frequency with
8-bit resolution. Even when 3 bits are lost due to long term instability of the detector and analog part of the system - resulting
in 7-bit effective resolution, the reasonable accuracy is still preserved. Additionally we have analyzed computational
power required to perform the real-time analysis of the GEM signal, taking into consideration resources offered by the
FPGA chip used in the prototype platform.
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