Design optimization of the complementary voltage controlled oscillator using a multi-objective gravitational search algorithm

Past decade has witnessed the progress of cross-coupled LC voltage controlled oscillator (VCO) in both academic and industrial communities. In this work, a new multi-objective optimization methodology is proposed to introduce an optimal design of a complementary cross-coupled LC-VCO. The design objective is to minimize the phase noise and power consumption of the oscillator at the oscillation frequency of 2.5 GHz and 1.5 V supply voltage. The important characteristics of the complementary LC-VCO which is one of the more popular cross-coupled configurations are described in sufficient details. In addition, the confirmation theorems of the proposed method are proven to show that the new version of Multi-Objective Gravitational Search Algorithm (MOGSA) can control the exploitation and exploration abilities of the algorithm. Hence the improved version of MOGSA has better performance against other popular multi-objective methods. The simulation results obtained from the circuit optimization are summarized to confirm the robustness of the proposed method.