Abstract
In this work, the operation mechanism of the Connected-Sources Parallel Quadrature Oscillator (CSPQO) is investigated meticulously through a novel perspective. It is proven that, unlike Disconnected-Sources Parallel Quadrature Oscillator (DSPQO), conduction angles of the switching and coupling transistors vary versus the coupling factor in CSPQO. This perspective leads to formulating CSPQO's drain currents to derive closed-form expressions for its phase noise for the first time. A comprehensive phase noise analysis for CSPQO is presented using Hajimiri's phase noise theorem. There are less than 2% and 1dB errors for oscillation amplitude and phase noise calculations. Besides, an inclusive comparison is performed between DSPQO and CSPQO, and it is established that CSPQO has a better performance for coupling factors less than 1. It is shown that a coupling factor of 0.35 is an optimum design point for CSPQO to have better phase noise and Figure of Merit (FoM) performances compared to DSPQO.
Published Version
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