Re: Oscillator Distortion

Like any PLL or ILL or AGC , you only have samples to correction error and never "continuous" correction unless integrated to a DC level. It is a discontinuous error correction with a filter to hold between inputs.
There are many ways to correct error by limiting the gain > 1 yet ensuring it can reach 1 to oscillate.  S/H, non-linear soft limiters, filters, peak detectors/comparators. It all depends on your specs for lock-in time and THD/IMD specs of the sine wave.
 >  > There's no requirement that the amplitude regulation be continuous.

 Phil Hobbs
 

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Cheers,
Tony Stewart   N. Of Toronto
EE since 1975 practising retirement since 2004