Product Description
The CA3 is an ASIC with 32/64-channels for energy resolved single-photon counting optimized for CZT/CdTe detectors. Each channel consists of a preamplifier, two shaping amplifiers, 3 or 6 (depending on operating mode) discriminators and 16-bit counters.
The CA3 has to main modes: 32 channel with 6 energy levels discriminated or with 64 channels and 3 energy levels discriminated. Each energy level is configured globally from input pads and can be adjusted per channel by internal DACs. The counters are outputted through a parallel interface, which makes it possible to connect multiple CA3 on the same bus.
Keywords: Energy Resolved Photon Counting, Singe-Photon Counting, X-Ray and Gamma-Ray Tomography
Publications
- J.P. Schlomka et al., “Experimental feasibility of multi-energy photoncounting K-edge imaging in pre-clinical computed tomography”, Phys. Med. Biol., 53 (2008) 4031-4047.
- X. Wang, et al., “A Digital Line-Camera for Energy Resolved X-ray Photon Counting”, Proc. Med. Imag. Conf. (NSS/MIC), IEEE 2009.
Product Features
| Detectors | CZT, CdTe |
| Detectors | CZT, CdTe |
| Application | Counting, Imaging |
| Number of inputs | 32 / 64 |
| Input charge range | 0 fC to -4.2 fC |
| Shaping time | 50 ns |
| Nominal capacitive load | 10 pF |
| Equivalent Noise Charge (ENC) | 105e + 40e/pF |
| Trigger threshold | Adjustable per channel |
| Trigger outputs | Common trigger output for all channels |
| Outputs | 16-bit counter parallel interface with overflow |
| Test and calibration | 1 digital in, 1 external capacitor and 1 internal capacitor |
| Power consumption | 210 mW (32 channel mode), 270 mW (64 channel mode) |