A 130 nm CMOS PLL for Phase-II ATLAS-MDT TDC

The high luminosity and interaction rate expected from the planned High Luminosity-Large Hadron Collider (HL-LHC) upgrade require a replacement and improvement of the ATLAS Muon-Drift-Tube (MDT) read-out electronics. This paper presents a Phase Locked Loop (PLL) intended to be used inside the improved Time-to-Digital Converter (TDC), which digitizes the arrival time and charge amplitude information. Starting from a 40 MHz input clock, the PLL provides output clocks of 160 MHz and 320 MHz with a phase resolution of 11.25° and 22.5°, respectively. The prototype, integrated in 130 nm CMOS technology, has 0.02mm2 of area and 1.2 V of supply voltage