Abstract
Abstract
A picosecond precision programmable digital delay line with
10 ps average resolution and 200 ns range using low-cost,
commercially available integrated circuits (MC100EP195 and DS1023)
is presented. This design is integrated into an existing product
(AOG-110 from Microchip Technology Inc.) to facilitate alignment
between 1 PPS and 5 MHz output waveforms based on user
selected features (e.g. zero-crossings or peak amplitudes) for
precision-timing applications. The performance of this design is
experimentally validated using logarithmic stepped delays from
10 ps to 200 ns with a median deviation of 1.9% from the
ideal. The largest deviations are observed in the range from
10 ps to 100 ps, attributed to the non-linear behavior of the
MC100EP195 in the design. Overall, this design is a low-cost,
digital delay option that can be easily integrated into any
microcontroller based system and does not require additional complex
design revisions. Further, this highlights the increased range and
precision options available by cascading commercially available
digital delay line integrated circuits.