Digital pulse-shape processing for CdTe detectors

Time walk correction of CdTe detectors using depth sensing technique

“…The arrival times of the pulses were then determined by feeding the shaped pulses to a digital zero-crossing CFD with 23 ns CFD delay and 0.24 attenuation factor, according to the best time resolution. With regard to the NE213 detector, since the pulses do not have the undesirable characteristics of variation in the pulse shape, no shaping is done on the pulses, and the arrival time is determined by direct application of a simple digital constant-fraction discriminator [15] to the PMT signals. The spectrum of the time difference between the arrival times of pulses from the two detectors is shown in Fig.…”

“…1. In addition to the pulse shape variations due to the different depths of interaction, further variation in the shape of detector pulses may be caused by the charge trapping and de-trapping in the detector crystal and also non-uniformities of the electric field [15]. As a result of the great variations in the shape of detector pulses, a significant time walk results, when the conventional CFD method is used.…”

A digital pulse processing system dedicated to CdZnTe detectors

“…Digital electronics allows quasioptimal filter synthesis [9], adaptive and complex signal processing [10], [11]. In addition, the latest technologies enable real-time processing at high sampling rates, excellent integration density and in-system reprogrammability.…”

A digital pulse processing system dedicated to CdZnTe detectors

“…Digital electronics allows quasi-optimal filter synthesis [5], adaptive and complex signal processing [6] [7]. In addition, the latest technologies enable real-time processing at high sampling rates, excellent integration density and in-system reprogrammability.…”