Design of A Wide-Range PLL Based on Dual VCO Technique for Sub-1G IoT Application

Abstract

A wide-range charge pump phase-locked loop (CPPLL) for Sub-1G Internet-of-Things (IoT) application is proposed in this paper. Dual voltage-controlled oscillator (VCO) technique is adopted to achieve wide frequency tuning range. In addition, the Kvcocompensation method is also employed to stabilize Kvcoin the entire frequency tuning range, combined with dual VCO structure. The design has been fabricated in CMOS 0.11 µm technology and the presented PLL achieved a wide frequency tuning range from 54.8MHz to 1.086GHz, with die area of 0.8 mm2. The measured phase noise is -85.92dBc/Hz and -116.23dBc/Hz at 100kHz and 1MHz, respectively, and the measured reference spur is -63dBc at 24MHz.