Castor 1.0, a VLSI analog-digital circuit for pixel imaging applications

被引:23
作者
Colledani, C
Comes, G
Dulinski, W
Hu, Y
Loddo, F
Turchetta, R
Bonvicini, V
Castelli, E
Pontoni, D
Prest, M
Rashevsky, A
Vacchi, A
机构
[1] UNIV STRASBOURG 1,IN2P3,LEPSI,F-67037 STRASBOURG 23,FRANCE
[2] IST NAZL FIS NUCL,TRIESTE,ITALY
关键词
pixel; imaging; VLSI; mixed circuits; low noise;
D O I
10.1016/S0168-9002(97)00607-4
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
We present a VLSI CMOS-mixed analog-digital circuit for high-rate pixel X-ray imaging applications. It consists of 32 channels at 80 mu m pitch. The total die size is 3.7 x 14 mm(2). Each channel features: a low-noise charge preamplifier, a CR-RC shaper, a buffer, a threshold discriminator and a 16-bit binary counter. The readout is done serially on a tri-state buffer. The main parameters of the analog part are: shaping time of 850 ns at 5 pF input capacitance, gain of 180 mV/fC, ENC (e(-) rms) = 60 + 17 C-d (pF) and a power consumption of 3.8 W/channel. The counting rate is limited by the analog part to around 100 kHz/channel for 1 fC charge pulses. Due to the parallelism of the circuit, photon rate in the order of 1 GHz/cm(2) can be measured for a pixel size of the order of 200 x 200 mu m(2). The parameters of the circuit were optimised for the Syrmep experiment, an R&D project in digital mammography. The circuit was produced in 1.2 mu m CMOS technology by AMS (Austria). Characterisation of the circuit, as well as first-imaging results of the circuit connected to microstrips or pixel detectors are presented. They show the circuit works according to specification and can be used for imaging applications.
引用
收藏
页码:435 / 442
页数:8
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