Design of a 1.85-4.3 GHz LC-VCO in 65 nm CMOS Technology for L-Band Applications

This paper presents an LC-VCO with complementary cross-coupled structure-based core topology for wide tuning range frequency generation (from 1.85 GHz to 4.3 GHz) for application in a Phase-Locked Loop (PLL)-based frequency synthesizer with extended frequency coverage. From layout level simulation by applying a 65 nm CMOS technology, the results indicate <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{PN}{@}1\mathrm{M}=-104.4\ \text{dBc}/\text{Hz}$</tex> at <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathrm{f}_{\text{out}}=4.0\ \text{GHz}$</tex> and tuning range = 79.7%.