1. Digital Circuits for Photon-Counting Pixel Detectors
Photon counting pixel with window discrimination
Pixel array
Department of Information Technology
Electronics Group

2. All-digital window discriminator
Objective
Design an efficient window discriminator with
small circuit area
that is modular and
that does not rely on internal or external timing references
Outline
Problem description
Design of the window discriminator
Results
Department of Information Technology
Electronics Group

3. Department of Information Technology
Problem description
count this event
Department of Information Technology
Electronics Group

4. Department of Information Technology
Design
Capture the behavior of the clock generator (ADWD)
The sequence of the input signal (LT,UT) will determine the clock signal (C) generation
Identify the states of the ADWD
Department of Information Technology
Electronics Group

5. Department of Information Technology
Logic design (cont.)
Logic synthesis - assume fundamental mode operation - use transition diagram
Department of Information Technology
Electronics Group

6. Department of Information Technology
Results
ADWD module
Area: 350 mm in a 0.6 mm CMOS process
Speed
minimum time between two consecutive pulses: 600 ps
minimum resolution time for window size: 100 ps
Department of Information Technology
Electronics Group