Is there a linear or switching voltage regualtor involved? Maybe it´s ringing..1.when the source voltage reduce to 4V from 5V,the spurious disappeared
Suggests loop instability. Redesign loop filter.1.when the source voltage reduce to 4V from 5V,the spurious disappeared;
2.when we change the tuning voltage,the frequency of spurious would change;
3.we use the battery as power supply ,but the spurious is not changed.
I‘m not sure tuning the voltage sufficiently clean,and adding the filter circuit can improve the phase noise,but the spurs do not change at all.
2 tuning mechanism is to increase bandwidth.We have a try that fix one tank circuit ,the spur is the same.
Me neither. Are you sure that the transistor is operated safely within maximum voltage ratings? Same question about varactor diodes.I can't understand why this phenomenon occurs only at low temperature
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