  The output of oscillators is usually not stable over time. In particular,
phase variations---or \emph{phase noise}---corrupts the oscillations. In this
letter, we describe a circuit that designed to average the phase noise
processes and frequency offsets in frequency-matched oscillators. The basic
circuit uses the independence of 2 phase noise processes to provide a cleaner
oscillating output with lower phase noise variance. We describe extensions of
the circuit designed to average out more than 2 oscillators, as well as a
single one through delay elements. In all the examples covered, we provide a
theoretical analysis of the resulting phase noise process when the input phase
noise processes follow a Wiener model.
