التفاصيل البيبلوغرافية
| العنوان: |
The GANDALF 128-Channel Time-to-Digital Converter. |
| المؤلفون: |
Büchele, M., Fischer, H., Herrmann, F., Königsmann, K., Schill, C., Schopferer, S. |
| المصدر: |
Physics Procedia; Dec2012, Vol. 37, p1827-1834, 8p |
| مصطلحات موضوعية: |
DIGITAL-to-analog converters, NUCLEAR physics experiments, FIELD programmable gate arrays, PHASE shift (Nuclear physics), NONLINEAR theories, PARTICLES (Nuclear physics) |
| مستخلص: |
Abstract: The GANDALF 6U-VME64x/VXS module has been designed to cope with a variety of readout tasks in high energy and nuclear physics experiments, in particular the COMPASS experiment at CERN. The exchangeable mezzanine cards allow for an employment of the system in very different applications such as analog-to-digital or time-to-digital conversions, coincidence matrix formation, fast pattern recognition or fast trigger generation. Based on this platform, we present a 128-channel TDC which is implemented in a single Xilinx Virtex-5 FPGA using a shifted clock sampling method. In this concept each input signal is continuously sampled by 16 flip-flops using equidistant phase-shifted clocks. Compared to previous FPGA designs, usually based on delay lines and comprising few TDC channels with resolutions in the order of 10 ps, our design permits the implementation of a large number of TDC channels with a resolution of 64 ps in a single FPGA. Predictable placement of logic components and uniform routing inside the FPGA fabric is a particular challenge of this design. We present measurement results for the time resolution and the nonlinearity of the TDC readout system. [Copyright &y& Elsevier] |
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