Hello,Some questions on xtal oscillator phase noise. Attached the measurement result of my series resonant xtal oscillator. It is a class A, ibias 5 mA, Ixtal 1 mArms. Transistor selected for low Rbb' 20 Ohm, Ft 100MHz. Reference voltage 5V from an ADR445, filtered with 10uF folie cap. Phase noise target -130dBc at 10Hz.
1. Is series resonant better or easier to engineer than parallel resonant?
2. Where should I have 20 dB/decade and where 30 B/decade? 3. Some suggestions for the next 25dB? 4. Is there more to learn from the attached picture? regards, Henk
<<inline: seriesOscillator_HtP.gif>>
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