DP5G Kit – OEM Digital Pulse Processor for Scintillators and PMTs - Amptek

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Company	Amptek
Description	DP5G Kit – OEM Digital Pulse Processor for Scintillators and PMTs
Bill of material	OXFVXLSK4
ORDERNO	OXFVXLSK4
CURRENT_INPUT current input	The input to the DP5G must be a current, not a voltage. U11 integrates the current pulse from the PMT. Some users have inserted a transimpedance amplifier between the PMT and the DP5G, providing a voltage input to the DP5G. This will not work properly with the standard DP5G configuration. The user can reconfigure the circuit to handle voltage inputs but the standard DP5G requires an input current pulse.
CUSTOM_CONFIGURATIONS custom configurations	The DP5G kit is designed to provide the user with a complete pulse processing system for scintillators that it easy to use. In custom or embedded applications the PCG boards may not be necessary if power supplies and connectors are available elsewhere in the system. Contact Amptek for more information on these applications or if you wish to use only the DP5G board and not the interface or AUX boards.
DP5G_CHARGE_AMPLIFIER dp5g charge amplifier	The analog prefilter in the DP5G differs from that of Amptek’s other digital processors the first stage of the DP5G is a charge amplifier rather than a voltage amplifier. This difference has important implications for the performance of the DP5G and how one interfaces with it. The plot below shows the DP5G charge amplifier and how it is typically connected to a PMT.
FAST_SCINTILLATORS fast scintillators	The charge amplifier permits the DP5G to be used with scintillators having a very fast time constant. Customers often ask “Since the ADC operates at 80 MHz (12 ns), how can you measure a scintillator with a 10 ns decay time” The current pulse Iin(t) into J2 may be fast, but the output of U11 is the time integral of Iin(t) (differentiated by a 3.2 µs time constant). A faster scintillator simply gives a faster rising edge to the output of U11. The figure below shows simulated results for three different time constants. The DP5G can accurately digitize very fast scintillators, because it is digitizing the output of the charge amplifier, not the input current.
FEATURES features	Integrated preamplifier, shaping amplifier, and MCA optimized for scintillation systems Processes PMT anode signal, giving complete spectrum Includes all power supplies for preamplifier and processor Standard USB and Ethernet connectors Whole system can be powered by USB or power over Ethernet For OEMs or custom laboratory users Highly configurable Low Power 600 mW typical List Mode
PMT_POLARITY pmt polarity	Most applications use a positive HV on the PMT anode, with the cathode grounded. But the DP5G works fine if the cathode is held at a negative HV and the anode is at virtual ground. In both cases, a pulse of electrons is accelerated from the cathode and injected across the coupling capacitor into the DP5G.
NAME name	OXFVXLSK4