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For proper calculation of phase noise induced by amplifier at close offsets one should use a flicker coefficient which is unknown in most cases (see Enrico Rubiola publications about phase noise in amplifiers). Ampllifier manufacturers don't measure this parameter because of small demand. Almost...
It is not necessary to have a feedback element with filtering properties. If you are not interesting about phase noise you can use delay line in feedback for oscillator.
If oscillation conditions are satisfied at two frequensies oscillation will occur at one of them - where gain margin will be...
I don't think so. Oscillation frequency determined by phase and amplitude balance in closed loop. Where the phase shift is 2*pi and transistor gain is greater than feedback loss there is (at this frequency) an oscillation. Feedback elemet may not have amplitude frequency response like bell. For...
Right. Absolute noise level at matched load kT-30=-174 dBm/Hz. Put ideal (noise free) sinusoidal signal with power p in through mathced transmission line to the load and you will get at the output a relative noise level -174-p. One half of this noise will be phase noise (i.e. -177-p) and the...
Building ultra low phase noise OCXO 100MHz i used XTAL filter with similar resonator and achieved 2 kHz BW. Oscillator noise floor -165 dBc/Hz after filtering improved down to -182 dBc/Hz.
DRO's are being used in TV Sat converters traditionally because DR was only resonator up to X-band and higher with small outlines. LC-tank may work at 10 GHz only in MMIC which are last 10-15-20 years in research. Obviously, MMIC VCO is suitable for applications without outstanding requirements...
I'm designing 100 MHz OCXO using 5 OT SC-cut quartz crystall. Such crystalls have B-mode 3 dB greater than C-mode.
How to supress it using external components? I need working schematic with equations for elements.
Complex schematics. I often use UHS CMOS invertors TinyLogic series from Fairchild. With them an -175 dBc/Hz noise floor and -150dBc/Hz at 1 kHz offset at 100MHz is achievable. And schematic is very simple.
Poor connector workign up to 8-10 GHz...with proper mounting...
This will be better
**broken link removed**
I saw this connector up to 32 GHZ worked with RO4350. Of course you must calculate proper coplanar line.
I think, it's impossible. Simple calculation gives Ql=1500 or greater for 300-500 MHz VCO. If you have -120 at 1 kHz, then at 100 kHz will be approx. -170...-160. In most cases noise floor of oscillators is -170...-160. Then f0/2Ql=100 kHz and Ql=1500...2500. Only YIG can give such Q in octave...
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