A 32 × 32 Channels, 3-cm~2, 555-mW Chip for X-Ray Pixel Detector Read-Out

摘要

In this paper we present a spectrometer realized by bump-bonding a 300-μm-pitch, 32×32 pixel silicon X-ray detector chip to a 0.35-μm CMOS, 3-cm~2 read-out chip. The self-triggered, mixed analog-digital read-out chip, with 1024 channels, digitizes the X-ray photon energy with 10 bits of resolution, provides the coordinates of the triggered pixels and achieves 34 (e_(rms))~- of input referred noise, ±3.3 LSB of INL and ±0.2 LSB of DNL, while consuming 555 mW from a 3.3 V supply. Preliminary experimental results on the complete spectrometer, obtained both with electrical stimulation of the device and by irradiating the detector with X-rays, are reported.