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Phase noise of oscillators can be improved through noise filtering. This paper presents a transformer-based harmonic filtering technique to improve the phase noise performance of the fully differential CMOS LC oscillators. The primary and secondary of the transformer are placed at the sources of NMOS and PMOS differential pairs, respectively. Due to the extra degree of freedom introduced by the transformer,...
A wide tuning range 24GHz VCO (voltage-controlled oscillator) using IBM 90nm CMOS process is presented. Switched inductor and two bits capacitance array offer a widely tuning range. In addition, optimized switches are adopted to improve both tuning range and phase noise performance. Simulation shows that -101dBc/Hz phase noise is achieved at 1MHz offset. The tuning range of the VCO spans from 21.9GHz...
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