Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2014, Vol. 25 ›› Issue (3): 030401 doi: 10.13538/j.1001-8042/nst.25.030401


Carry-chain propagation delay impacts on resolution of FPGA-based TDC

DONG Lei, YANG Jun-Feng, SONG Ke-Zhui   

  1. 1State Key Laboratory of Particle Detection & Electronics, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
    2Anhui Key Laboratory of Physical Electronics, Hefei 230026, China
  • Contact: YANG Jun-Feng
DONG Lei, YANG Jun-Feng, SONG Ke-Zhui. Carry-chain propagation delay impacts on resolution of FPGA-based TDC.Nuclear Science and Techniques, 2014, 25(3): 030401     doi: 10.13538/j.1001-8042/nst.25.030401


The architecture of carry chains in Field-Programmable Gate Array (FPGA) is introduced in this paper. The propagation delay time of the rising and falling edges in the carry chains are calculated according to the architecture and they are predicted not equal in most cases. Tests show that, measuring the propagation delay time in EP3C120F484C8N series FPGA of Altera, the results are in line with the inference. The difference of propagation delay time results in different accuracies of TDC. This phenomenon shall be considered in the design of TDC implemented in FPGA. It can ensure better accuracy.

Key words: FPGA Firmware, Carry chains, Propagation delay time, TDC