Sung-Rung HanChi-Nan ChuangSHEN-IUAN LIU2018-09-102018-09-102007-0115497747http://scholars.lib.ntu.edu.tw/handle/123456789/333711https://www.scopus.com/inward/record.uri?eid=2-s2.0-33847609601&doi=10.1109%2fTCSII.2006.883826&partnerID=40&md5=b825ab7766f2692509e7e61db3cc6f46A time-constant calibrated phase-locked loop with a fast-locked time is presented. A variable capacitance multiplier (VCM) is developed to adjust the equivalent capacitance in the loop filter. And a calibration circuit is used to allow the time constant of the loop filter to track with the reference clock. By using the proposed time-constant calibration circuit and the VCM, the fast acquisition time is achieved and the loop capacitance is also multiplied. A prototype has been fabricated in a 0.35-μm CMOS process to demonstrate the proposed circuit. © 2007, IEEE. All rights reserved.Fast locked phase-locked loop (PLL); time-constant calibration; variable capacitance multiplier (VCM)[SDGs]SDG7Calibration; Capacitance; CMOS integrated circuits; Digital filters; Fast locked; Time-constant calibration; Variable capacitance multiplier (VCM); Phase locked loopsjournal article10.1109/TCSII.2006.8838262-s2.0-33847609601WOS:000243890700008