Product Description

The VASCM3.2 is a 128 channel low-noise/low power current sensitive preamplifier-filter circuit, with two-channel alternating sample and hold. The ASIC has switched current mode, correlated double sampling and dead time free readout. The integrated signals are read out by a serial multiplexer after S/H. The VA_SCM3.2 design is based on the existing VA_SCM2. Four gain settings with dynamic range: 1pC, 2.5pC, 6pC, and 20pC at 1.5V output voltage. Also, includes means for Correlated Double Sampling (CDS) and can be used in a separate operational mode.
Keywords: Current mode x-ray readout, portal imaging, Current mode x-ray readout, portal imaging, radiation dosimetry, CDS, variable gain, pre-amplifier


  • Östling, Janina, et al. “A radiation-tolerant electronic readout system for portal imaging.” Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 525.1 (2004): 308-312, doi:10.1016/j.nima.2004.03.079
  • Fedorovich, O., et al. “Metal micro-detectors: Development of «transparent» position sensitive detector for beam diagnostics.” Problems of Atomic Science and Technology, Series «Plasma Physics 6.82 (2012): 196-198, VANT

Product Features

Detectors Silicon, thin-film transistor (TFT) arrays
Detectors Silicon, thin-film transistor (TFT) arrays
Application Imaging, Spectroscopy, Calorimetry
Number of inputs 128
Input charge range 4 gain settings: ±1 pC, ±2.5 pC, ±6 pC and ±20 pC
Outputs Multiplexed pulse height with CDS
Test and calibration Internal calibration circuit