An asynchronous pixel architecture for simultaneous radiation imaging and spectroscopy on a real-time basis

A pixel chip is presented, employing an asynchronous architecture capable of simultaneous imaging and spectroscopy, on a real-time basis, with no external control signals. The mixed analog-digital architecture has been implemented using a commercial 0.8 /spl mu/m CMOS technology. The detectors are monolithically integrated with the pixel electronics. The pixel pitch is 300/spl times/300 /spl mu/m/sup 2/. The measured gain is 1270 mV/fC at. 200-ns shaping time, and the ENC is 18 e/sup -/ at 40-fF total input capacitance. The power dissipation per pixel is 2 mW at. 3.3 V.