  The paper explores a previously unknown connection relating the symmetry
properties of an oscillator steady-state to the orthogonal representation of
amplitude and phase variables in the small-signal regime. It is shown that only
circuits producing perfectly symmetric steady-states can produce an orthogonal
Floquet decomposition. Considering room temperature operation this scenario
implies zero AM-PM noise conversion. This surprising and novel result follows
directly from the predictions of a rigorous model framework first described
herein. The work presented in this text extend the current state-of-the-art
w.r.t. oscillator small-signal/noise characterization.
