Preamplifier

The preamplifier should increase the SiPM's weak pulse amplitude by ca. 20dB and must be located as close as possible to the SiPM. Therefore, a plug-on PCB for the SiPM board with the same form factor was designed, which shall be as versatile as possible in order to adapt for different read-out concepts with following properties:

• supply of the SiPM bias voltage through the preamp including bias filter
• AC-coupling of the preamp input
• based on low-noise Infineon MMIC BGA614
• mounting option for one (default, positive output) or two MMIC stages
• options for preamp voltage supply (+5V): via separate connector (J2) or remote powering via output signal (default)

Preamplifier schematic

mounted preamp (top) and photosensor PCBs (bottom) with one instrumented SiPM

Mounted preamp plugged on the pin headers of the SiPM board of an assembled detector plate