Jerry wrote:
I have been trying to find a way [to] explain how a high harmonic oscillator stage is even possible and zip.
Simple. Use a circuit with way more gain than necessary, and bias it so that it goes into saturation at the one end of its voltage excursion long before the current gain drops off at the other end. So, its average gain over a whole cycle comprises a pretty linear region bounded on the one end by a region of near-zero gain due to hard clipping. Since the gain element loads the resonator heavily during the period of saturation, the circuit Q is much less than it should be -- so even if you take the output from a relatively high-Q node, there isn't enough Q to filter out the high harmonic content.
Lots of commercial oscillator products have been built exactly that way, usually with a Tee or Pi output filter with moderate Q (an output network of some sort is necessary anyway to match a 50 ohm load -- using a Tee or Pi with some Q cuts the harmonics to a dull roar).
Best regards, Charles _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
