Delay-locked loop technique for temperature stabilisation of internal delays of CMOS FPGA devices

A delay-locked loop (DLL) technique for use with typical CMOS field programmable gate array (FPGA) devices is presented. It allows for temperature stabilisation of the internal delays of the devices, especially when the digital delay lines are designed. The voltage V_cc supplying the FPGA device is varied within a limited range by the DLL to stabilise the internal delays of the device under changes in the ambient temperature. The method is illustrated by presenting results of the realisation of an interpolating time counter with 200 ps resolution, implemented on a single CMOS FPGA device