Pico-second time interval amplification

This paper presents a modified Delay Locked Loop (DLL) based Time Difference Amplifier (TDA) that utilizes a Dynamic-Logic Phase Frequency Detector (PFD). The zero dead-zone characteristic of the Dynamic-Logic PFD allows the DLL to eliminate phase error and maintain a stable gain for single picoseconds input time intervals. The TDA has been designed in 0.13μm CMOS technology. The simulation result demonstrates a linear transfer characteristic for an input time interval range from 0 to 90 ps and a gain shift less than 4.2% under ±10% supply voltage variation and temperature range from -40□ to 80□.