W-S ChangD-N JhouY-H YangT-C LeeTAI-CHENG LEE2019-10-242019-10-242017https://scholars.lib.ntu.edu.tw/handle/123456789/428028An energy-efficient self-charged crystal oscillator (SCXO) employing a quadrature-phase shifter is proposed to provide wide-range pulse injection timing for power consumption reduction. The passive resistors of quadrature-phase shifter can be shared by the startup circuit to save area consumption. The double-edge extractor and the low-power comparator are added to reduce the power consumption. The proposed 32.768-kHz energy-efficient SCXO, fabricated in a 40-nm CMOS technology, consumes 34.3 nW under a 1 V supply. © 2017 IEEE.32.768-kHz; Double-edge extractor; Low-power comparator; Quadrature-phase shifter; Self-chargedcrystal oscillator (SCXO)[SDGs]SDG7Comparators (optical); Crystal oscillators; Electric power utilization; Phase shifters; 32.768-kHz; Double-edge extractor; Low power comparator; Quadrature phase; Self-chargedcrystal oscillator (SCXO); Energy efficiencyconference paper10.1109/asscc.2017.82402142-s2.0-85045746249