CAJ | 학술논문

针对应用于同步辐射的硅像素探测器，设计了一种基于电流模式的像素型前端读出单元电路，像素单元电路主要包括电荷灵敏前置放大器、跨导放大器、电流甄别器、阈值调节电路和计数器等，实现了信号放大、电压转为电流、信号甄别以及计数等功能。芯片基于SMIC 0．13μm／1．2V CMOS工艺设计，像素单元面积为100μm ×100μm，仿真结果表明：像素单元静态功耗为50μW，等效噪声电荷低于100e－，不一致性小于100e－，能量甄别范围为8 keV～20 keV，达到了预期设计目标。与电压模式的像素单元电路相比，具有结构简单、功耗低、芯片面积小以及抗干扰能力强的特点。
침대응용우동보복사적규상소탐측기，설계료일충기우전류모식적상소형전단독출단원전로，상소단원전로주요포괄전하령민전치방대기、과도방대기、전류견별기、역치조절전로화계수기등，실현료신호방대、전압전위전류、신호견별이급계수등공능。심편기우SMIC 0．13μm／1．2V CMOS공예설계，상소단원면적위100μm ×100μm，방진결과표명：상소단원정태공모위50μW，등효조성전하저우100e－，불일치성소우100e－，능량견별범위위8 keV～20 keV，체도료예기설계목표。여전압모식적상소단원전로상비，구유결구간단、공모저、심편면적소이급항간우능력강적특점。
A front-end readout circuit based on current-mode approach has been designed for silicon pixel detector used in synchrotron radiation detection.The pixel circuit is composed of a charge sensitive preamplifi-er, an operational trans-conductance amplifier, a current-mode discriminator, a threshold adjustment circuit and a counter.It can perform signal amplification, voltage-to-current conversion, signal discrimination and counting.The chip is designed on SMIC 0.13 μm/1.2V CMOS technology, with a pixel size of 100 μm ×100μm.Simulation results show that the static power consumption of the pixel is 50μW, with an equivalent input noise of less than 100e-rms.The threshold uniformity is also better than 100e -rms, and the energy detection range is from 8 keV to 20 keV, which fulfill the specification.Compared with the existed chip based on voltage-mode approach, the current-mode approach owns advantages of compact structure, low power, small occu-pation and good noise immunity.