A comparison of methods for time-to-digital conversion based on independent coding lines and multi-edge coding

This paper presents the comparison of main properties of two recently developed methods for precise time-to-digital conversion based on time coding respectively in independent coding lines and with the use of multi-edge pattern signal. An essential advantage of these methods consists in capability to overcome the technological limitation of conversion resolution of methods commonly used so far. Both methods were used to design two time counters implemented in the same programmable device. Then the counters were tested in identical measurement conditions and obtained results were compared in the context of main metrological, design, technical and economic parameters.