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

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 K
_vco
compensation method is also employed to stabilize K
_vco
in 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 mm
²
. 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.