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 ›› 2010, Vol. 21 ›› Issue (2): 123-128 doi: 10.13538/j.1001-8042/nst.21.123-128

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles    

A high precision time-to-digital converter based on multi-phase clock implemented within Field-Programmable-Gate-Array

CHEN Kai1, 2 LIU Shubin1, 2 AN Qi1, 2,*   

  1. 1Key Laboratory of Technologies of Particle Detection & Electronics,Chinese Academy of Sciences, Department of Modern Physics, University of Science and Technology of China, Hefei 230026,China 2 Anhui Key Laboratory of Physics Electronics, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
CHEN Kai, LIU Shubin, AN Qi. A high precision time-to-digital converter based on multi-phase clock implemented within Field-Programmable-Gate-Array.Nuclear Science and Techniques, 2010, 21(2): 123-128     doi: 10.13538/j.1001-8042/nst.21.123-128

Abstract:

In this paper, the design of a coarse-fine interpolation Time-to-Digital Converter (TDC) is implemented in an ALTERA’s Cyclone FPGA. The carry-select chain performs as the tapped delay line. The Logic Array Block (LAB) having a propagation delay of 165 ps in the chain is synthesized as delay cell. Coarse counters triggered by the global clock count the more significant bits of the time data. This clock is also fed through the delay line, and LABs create the copies. The replicas are latched by the tested event signal, and the less significant bits are encoded from the latched binary bits. Single-shot resolution of the TDC can be 60 ps. The worst Differential Nonlinearity (DNL) is about 0.2 Least Significant Bit (LSB, 165 ps in this TDC module), and the Integral Nonlinearity (INL) is 0.6 LSB. In comparison with other architectures using the synchronous global clock to sample the taps, this architecture consumed less electric power and logic cells, and is more stable.

Key words: Time-to-digital converter, Multi-phase clock, Carry-select chain, Field-Programmable-Gate-Array