One can make a low distortion tuneable oscillatorby incorporating an active filter inside an AGCloop. With a control voltage VG of 0.1 to 2V, onecan obtain over a decade of tuning range, withoscillation frequencies from 200 kHz to 3 MHz inthis particular design. Total Harmonic Distortion(THD) is b64.5 dB at VG e 1V, and is keptbelow b57 dB over most of the tuning range.Modulation sidebands due to loop jitter are atleast 50 dB down over the entire tuning range,with suppression approaching 56 dB for higherVG. Linearity error for fOSC vs. VG is below 4%.
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