A 0.026mm2 5.3mW 32-to-2000MHz digital fractional-N phase locked-loop using a phase-interpolating phase-to-digital converter. - Tae-Kwang Jang; Nan Xing; Frank Liu 003; Jungeun Shin; Hyungreal Ryu; Jihyun F. Kim; Taeik Kim; Jaejin Park; Hojin Park (ISSCC, 2013)