A Novel Encoder for TDCs
We present a novel encoder design for FPGA-based Time-to-Digital Converters (TDCs) that use tapped delay lines. The encoder is the most challenging and problematic unit on such measurement devices. Recent developments in TDC methodology include the Wave Union principle, and encoders based on population count. These two methods can alleviate fundamental disadvantages of FPGA-based TDCs. However, it appeared to be problematic to combine the two methods. The contribution of this paper is a special arithmetic unit that allows us to combine these two methods into a fast and compact encoder.
The paper is a report on work in progress, real-world measurement results cannot be given at this point in time.
KeywordsTDC Wave Union Population count Encoder
- 1.Horstmann, M.: Picosecond TDC Design. Ecole de microélectronique 2017 de l’IN2P3, Paris, 14–19 May 2017Google Scholar
- 2.Lattice Semiconductor: ECP5 and ECP5-5G Family Data Sheet. FPGA-DS-02012 Version 1.9, March 2018Google Scholar
- 4.Uǧur, C., Korcyl, G., Michel, J., Penschuk, M., Traxler, M.: 264 channel TDC platform applying 65 channel high precision (7.2 psRMS) FPGA based TDCs. In: 2013 IEEE Nordic-Mediterranean Workshop on Time-to-Digital Converters, Perugia, Italy, 3 Oct 2013 (2013)Google Scholar
- 6.Wu, J., Shi, Z.: The 10-ps wave union TDC: improving FPGA TDC resolution beyond its cell delay. In: IEEE Nuclear Science Symposium, Dresden, Germany, 19–25 Oct 2008 (2008)Google Scholar