A time-over-threshold machine: The readout integrated circuit for the BABAR silicon vertex tracker
A time-over-threshold machine: The readout integrated circuit for the BABAR silicon vertex tracker
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DOI：
10.1109/23.603658
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发表时间：
1997-06-01
影响因子：
1.8
通讯作者：
Roe, N
中科院分区：
文献类型：
--
作者：
Kipnis, I;Collins, T;Roe, N
一个低噪声，混合信号，128通道CMOS集成电路包含完整的读出电子BABAR硅顶点跟踪器已经开发。本实施方案的突出特征是能够在单个单片芯片上同时执行低电平信号采集、去随机化数据存储、稀疏化和数据传输。来自检测器条的信号被放大，由具有100 ns、200 ns、300 ns或400 ns的数字可选峰值时间的CR-RC 2滤波器整形，然后提供给超过阈值的时间处理器以实现压缩型模数转换。数字信息被存储、稀疏化，并在收到命令时通过串行链路读出。数字部分工作于60 MHz输入时钟，噪声测量峰值时间为200 ns，每通道总功耗为3.5 mW，在12 pF附加源电容下，等效噪声电荷为600 el，rms。芯片尺寸为5.7 mm x 8.3 mm，包含330 k晶体管。第一个全尺寸的原型是在辐射软0.8 μ m，3-金属CMOS工艺制造。同样的电路现在正在用类似的抗辐射技术制造。
A low-noise, mixed-signal, 128-channel CMOS integrated circuit containing the complete readout electronics for the BABAR Silicon Vertex Tracker has been developed. The outstanding feature of the present implementation is the ability to perform simultaneously low-level signal acquisition, derandomizing data storage, sparsification and data transmission on a single monolithic chip.The signals from the detector strips are amplified, shaped by a CR-RC2 filter with digitally selectable peaking time of 100 ns, 200 ns, 300 ns, or 400 ns, and then presented to a time-over-threshold processor to implement a compression type analog-to-digital conversion. The digital information is stored, sparsified and read out through a serial link upon receipt of a command. The digital section operates from a 60 MHz incoming clock.Noise measurements at 200 ns peaking time and 3.5 mW total power dissipation per channel yield an equivalent noise charge of 600 el, rms at 12 pF added source capacitance, The chip measures 5.7 mm x 8.3 mm and contains 330k transistors. The first full-scale prototype was fabricated in a radiation soft 0.8 mu m, 3-metal CMOS process. The same circuit is now being fabricated in an analogous radiation hard technology.