Changes

# adjustable gain, ranging from readout of hundreds of pixels to calibration with single-photon counting

# adjustable gain, ranging from readout of hundreds of pixels to calibration with single-photon counting

# less than 15% gain variability on transistor <math>\beta</math> (<math>h_{FE}</math>) parameter  

# less than 15% gain variability on transistor <math>\beta</math> (<math>h_{FE}</math>) parameter  

# summing circuit to pool SiPM signals in groups of 5 (readout of individual channels must not affect readout of the some regardless of termination used)

# summing circuit to pool SiPM signals in groups of 5 (readout of individual channels must not affect readout of the sum regardless of termination used)

# minimized pulse duration for higher running rates

# minimized pulse duration for higher running rates

# minimized power consumption

# minimized power consumption