R & D Study on High Speed and High Precision Frontend Electronics for Electromagnetic Shower Calorimeter.

高精度、高速度的电磁簇射量热计是高能物理研究中的重要组成部分。我们在CERN、IHEP（Protvino）和GAMS合作的框架下开发了闪烁重晶体PWO（PbWO 4，lead tungstate）。KEK-大学。为满足PWO的性能要求，需要同时开发一种高精度、高速度的PWO前端ADC，要求ADC系统的线性度优于10位（0.1%），动态范围优于13位（10^4），转换时间小于3 μ s。对于具有数千个以上通道的检测器系统，功耗也将是重要的。我们已经开发了一种用于QAC-ADC组合布置的ADC系统的全定制QAC（电荷到幅度转换器）电路。QAC电路是为满足这一要求而开发的最重要的电路 ...更多信息 他的要求。QAC的规格可能优于10位的线性度; 13位的动态范围和3 μ s的转换时间功耗可以预期小于180 mW。我们在一个芯片中容纳了两个独立的QAC，具有不同的灵敏度x4和x1，以满足宽动态范围10^4的要求。QAC的开发在Harris公司的IC工程上进行。UIIF-I过程。全定制QAC IC芯片的第一个原型（QAC 100 SdM）已经在Microsim的计算机模拟上设计并由Harris公司制造。芯片的测试结果表明，在所要求的规格，即超过10位的线性度，1200 Pc的满量程和2 μ s的转换时间的优异性能。测试结果表明，只要仔细选择参数，转换时间可望优于lmus。QAC 100 SdM QAC集成电路可作为目前和未来高能物理研究的标准ADC系统。少

It is primarily important for high energy physics studies to have a high precision and high speed electromagnetic shower calorimeter for gamma detection. Radiation hardness is also another importance of it. We have developed the scintillation heavy crystal, PWO (PbWO4, lead tungstate) under the framework of the GAMS collaboration among CERN, IHEP (Protvino) and. KEK-Universities. A high precision and high speed frontend electronics, ADC for PWO is also desired to be developed at the same time to meet the performance of PWO.The specification requested for an ADC system will be better than 10 bits (0.1%) for linearity, 13 bits (10^4) for dynamic range and less than 3 mus for conversion time. Power consumption will also be important for use for a detector system with more than multi-thousands channels.We have developed a full-custom QAC (charge to amplitude converter) circuit for an ADC system of the QAC-ADC combined arrangement. QAC is the most important circuit to be developed to meet t … More he requirements. The specification for QAC might be better than 10 bits of linearity ; 13 bits of dynamic range and 3 mus of conversion time Power consumption can be expected to be less than 180 mW.We accommodate two independent QAC's with different sensitivities of x4 and xl in one chip in order to meet the requirement of wide dynamic range of 10^4. The development of the QAC is performed on the IC engineering of the Harris company. UIIF-l process. it is the new full-custom bipolar process and is known to be hard for radiation damage.The first prototype of the full-custom QAC IC chips (named QAC 100SdM) have been designed on a computer simulation of Microsim and been fabricated by the Harris company . The test results of the chips have shown the excellent performance over the requested specifications, i.e. more than 10 bits for linearity, 1200 Pc for full scale and 2 mus for conversion time. The test results shoes that the conversion time will be expected better than lmus with careful choice of the parameters. The power consumption has been reduced to 140 mW.The QAC 100SdM QAC IC can be used as a standard ADC system for high energy physics studies of planning at present and of coming in future. Less