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Digital-to-Time Converter for pulse train generation based on Look-Up Tables in FPGA

Kwiatkowski P., Różyc K., Szplet R.

Measurement Automation Monitoring

2018

Vol. 64, No. 1

14--16

A Digital-to-Time Converter (DTC) is presented which allows to generate pulse train with resolution of 250 ps within 32 ns operation range. The converter is implemented in off-the-shelf Spartan-6 Field-Programmable Gate Array (FPGA) device, manufactured by Xilinx in 45 nm CMOS technology. The design is implemented with the use of Look-Up Tables (LUT) as delay elements. “Manual” Place and Route (P&R) process was involved to improve conversion linearity. Developed DTC can be used to improve the functionality of time interval generators.

5 ps Jitter Programmable Time Interval/Frequency Generator

Kwiatkowski P., Różyc K., Sawicki M., Jachna Z., Szplet R.

Metrology and Measurement Systems

2017

Vol. 24, nr 1

57--68

A new time interval/frequency generator with a jitter below 5 ps is described. The time interval generation mechanism is based on a phase shifting method with the use of a precise DDS synthesizer. The output pulses are produced in a Spartan-6 FPGA device, manufactured by Xilinx in 45 nm CMOS technology. Thorough tests of the phase shifting in a selected synthesizer are performed. The time interval resolution as low as 0.3 ps is achieved. However, the final resolution is limited to 500 ps to maximize precision. The designed device can be used as a source of high precision reference time intervals or a highly stable square wave signal of frequency up to 50 MHz.