Design of a Nanosecond Voltage Comparator with PECL Logic for a Photon-Counting Radiation Imaging System Application

Table 1

Characteristics of comparator input signals.

Source intensity (Ci)	Detection efficiency (%)	No-load count rate	Pileup rate (%)	Average pulse width (ns)
30	73	3.58 × 10^5/s	2.18	61.42
50		5.97 × 10^5/s	3.60
100		1.19 × 10^6/s	7.07
300		3.58 × 10^6/s	19.75

The no-load count rate and the pileup rate under different source intensities are calculated by equations (1) and (2), respectively.