LC-VCO Design with Switched Varactor Array for L-Band in 65 nm CMOS Technology

This work presents a design of a complementary cross-coupled LC-VCO with Switched Varactors Array (SVA) that has been designed on a 65 nm TSMC process for an application in L-Band communication systems. Consuming a total of 9.7 mA of current by applying a 1.8 V power supply, it achieves a single sideband phase noise of -112.7 dBc/Hz at a frequency offset of 1.0 MHz. The LC-VCO uses inductors, varactors, fine tuning circuits, and coarse tuning circuits to generate a frequency range from 1.65 GHz to 4.0 GHz. To contextualise this paper in relation to others in the field, a comparative analysis was carried out using the Figure of Merit (FoM<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">t</inf>) as a parameter to assess performance, where the following value were obtained: -192.68.