  Many scientific and astronomical instruments need precise time measurement
with high resolution between two or more events which is very challenging since
decades. Presently a fast response of high resolution 17.1ps Digital Event
Timer (DET) has been implemented using FPGA. The floor plan of FPGA is
purposely arranged to get the higher resolution for timing measurement. As
compared to various event timers (time to digit converters), the present design
has better accuracy and higher resolution. The present DET is using the clock
frequency (GHz) capable of measuring time in fraction microseconds and a unique
asynchronous vernier approach to measure the time fraction of clock cycle which
increases its resolution compared to Digital Event Timers. Fast response and
higher resolution make it a better choice for multi KHz satellite laser ranging
and other LIDAR applications.
