用于X射线探测的多通道电荷读出芯片

doi:10.19665/j.issn1001-2400.2021.04.013

Abstract

Abstract:

To solve the problem of large area and high power consumption of the traditional multi-channel charge readout circuit for X-ray detection,a new multi-channel charge readout circuit structure is presented.The circuit integrates 32 charge acquisition channels,including an integrator,a differential output buffer,a digital control logic circuit and other functional modules.The proposed structure reduces the power consumption and area by integrating the sample and hold circuit and the correlated double sampling circuit into the output buffer.In order to reduce the offset and low-frequency noise,the correlated double sampling technology has been adopted.In addition,the way of overlapping the outputs between the even and odd channels is adopted to realize continuous transmission of the multi-channel signals.The chip has been fabricated using the CMOS 0.25 μm process with the chip size of 2.87 mm×2.68 mm.Measurement results show that the power consumption of each channel is 1.5 mW under the 5.0 V voltage supply and 2.5 V reference voltage.When the integrated capacitor is 7.8 pF,the integration non-linearity is less than 0.1% and the dynamic range reaches 13 100.

Key words: X-ray, multi-channel, charge readout circuit, low noise, dynamic range

CLC Number:

TN492

LIU Hong,XU Le,TIAN Tong. Multi-channel charge readout ASIC for X-ray detection[J].Journal of Xidian University, 2021, 48(4): 97-102.

Figures/Tables 9

References 15

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性能	文献[13]	文献[14]	文献[15]	文中方法
工艺	CMOS 0.35 μm	CMOS 0.18 μm	CMOS 0.18 μm	CMOS 0.25 μm
通道数	32	32	1	32
电源电压/V	5.0	1.8	1.8	5.0
转换速率/MHz	1	40	1	1(2 @max)
积分线性度		<0.27%	0.1%(仿真值)	0.1%@7.8 pF
动态范围	8000@C_f=2.4 pF	10 bit		6 000@C_f=2.6 pF,
				13 100@C_f=7.8 pF
芯片面积/mm²	4.9×1.8	2.082×2.63	0.85×0.35	2.87×2.68
		(front-end) &
		2.169×2.937
		(@SCA)*
功耗/(mW·CH^-1)	6.25	2.00	4.00	1.50

Multi-channel charge readout ASIC for X-ray detection

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