128 Channel General Purpose Readout

128-channel “general purpose” charge sensitive amplifier. Each channel features buffered preamplifiers, a shaper with sample/hold, multiplexed analogue readout and calibration facilities. In addition, each channel has a “fast” shaper that gives a trigger signal. The analogue value and the address of the triggering channels are read out. The ASIC can output all channels, only triggered, or triggered channels with neighbors. Each channel has input leakage current compensation automatically adjusted in each preamplifier channel. This ASIC can be used in parallel with many ASICs, sharing all output lines and some control lines.

Keywords: Readout, ASIC, charged particle tracking

Product Features

DetectorsSi, hybrid photon detector (HPD)
ApplicationCounting, Imaging
Number of inputs128
Input charge range±30 fC
Shaping time500ns (VA), 50ns (TA)
Nominal capacitive load10 pF
Equivalent Noise Charge (ENC)70e + 12e/pF
Trigger thresholdProgrammable by 5-bit DAC
Trigger outputsDigital address of triggering channel
OutputsMulti-hit, multi-plexed amplitude, differential current, serial analogue, sparse readout
Test and calibrationInternal calibration circuit


  • A. Studen et al., "A silicon PET probe", Nuclear Instruments and Methods in Physics Research, Volume 648 (2011)