Analysis and Optimization of Differential LC VCO with Filtering Technique in IoGaP/GaAs HBT Technology

InGaP/GaAs HBT 기반의 필터 기술을 이용한 차동 LC 전압조절발전기의 분석 및 최적화

In this paper, differential cross coupled LC VCOs with two noise frequency filtering techniques are proposed. Both VCOs are based on symmetric capacitor with asymmetric inductor tank structure. The VCO using low pass filtering technique shows low phase noise of -130.40 dBc/Hz at 1 MHz offset when the center frequency is 1.619 GHz. And the other VCO using band pass filtering technique shows -127.93 dBc/Hz at 1 MHz offset frequency when center frequency is 1.604 GHz. Two noise frequency filtering techniques are approached with different target.