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This still is surprising as modern DDS and PLL based generators have or should have enough PLL loop bandwidth to avoid/correct this problem.
Two way radios with PLL and build-in loudspeakers have long solved this problem and a fan should be much less complicated. If it is conducted rather then...
This is correct, not always do you need -185dBc/Hz at 100 Mhz , at 10 Ghz the noise floor of - 136 dBc/Hz at 10 KHz offset , or -172 dBc/Hz at 1 MHz.
But this needs cross correlation.
Ulrich Rohde
The first thing to do is not to take a transistor with an unnecessary high fT and to have a clean layout where the transistor does not oscillate without the resonator. Connect a spectrum analyzer to the output and monitor this. Grounded base circuits are often highly unstable. Adding resistors...
Look at the size of these sapphire oszillators and at the effect of a buffer stage.
Paralleling 2 transistors depends on the type , some experimenting is needed
Added after 1 hours 57 minutes:
No, HFe of the transistors will not bee the same, and this is only applicable for flicker noise...
The parallel configuration of bipolar transistors is found above 2 GHz using smaller transistors. Even at 50 GHz, this works but some stability problems may be observed
phase in agilent ads
General comments on noise :
The early oscillator pioneers like Leeson, Driscoll, Healey III , Parker and others did their analysis based on linear assumptions, which do not get the same good results as available today. The modern methods require large signal parameters...
vco spectrerf
Hi guys,
your results MUST be wrong since a 6 KHz Hz off the carrier the phase noise cant be more then the output power of typically 0 to 10 dBm. Also the curve cant be correct as there is no flicker frequency contribution . I don't have ever used cadence RF ,I would recommend...
common gate lna circuit
Common gate (or its equivalent common base ) amplifier are really not low noise. It is barely possible to get better then 5dB NF. The reason is that that for Fmin , Gamma Opt and S11* are too far apart. A simulation with the correct Data will show that Fmin << NF...
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