A Low-Phase-Noise Wide-Tuning-Range Oscillator Based on Resonant Mode Switching

Abstract

, Senior Member , IEEE Abstract—In this paper we will present a low-phase-noise wide-tuning-range oscillator suit able for scaled CMOS processes. It switches between the two resonant modes of a high-order LC resonator that consists of two identical LC tanks coupled by capacitor and transformer. The mode switching method does not add lossy switches to the resonat or and thus doubles frequency tuning range without degrading phase noise performance. More- over, the coupled resonator leads to 3 dB