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The 10-ps Multitime Measurements Averaging TDC Implemented in an FPGA

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5 Author(s)
Jinhong Wang ; Dept. of Modern Phys., State Key Lab. of Particle Detection & Electron., Univ. of Sci. & Technol. of China, Hefei, China ; Shubin Liu ; Lei Zhao ; Xueye Hu
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We present a theoretical analysis of the characteristics of a multitime averaging TDC and an improved implementation scheme that is adapted to our previous version of FPGA TDCs from Xilinx Virtex 4 family without any modifications to the hardware. Using MATLAB we simulate the timing performance of the multitime averaging TDC on a variety of averaging times. The simulation results are verified with bench-top tests. Based on the agreement between the theoretical analysis and bench-top tests, we offer guidelines for optimizing timing performance. With a 4 times averaging TDC we achieve a typical timing performance of 9 ps RMS and 12 ps effective bin size. Without the averaging scheme the timing performance is 25 ps RMS and 50 ps per bin size.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:58 ,  Issue: 4 )

Date of Publication:

Aug. 2011

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