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Loop of the pll.
Pll noise floor. That was the sweep that took the longest 120 seconds on the hp8568b. Pll normalized phase noise 9 log frequency bw everything except vco vco g a i n d b 0 20 log n pll flat noise fom pn1hz pll noise floor normalized to1 hz n counter added noise 20 log n pll flicker noise pn10khz usually dominates at offset below 1 khz pll 1 f normalized to 1 ghz output and 10khz offset. Phase noise pll phase noise ref 20 log f pll f ref dbc hz. Figure of merit in a pll is the normalized phase noise floor of the phase detector.
The unit of measurement is dbc hz. This is generally synthesizer divider noise and phase detector noise. For instance if dithering is disabled typically the noise floor does not degrade at all and just spurs are added. L floor l 1hz 20log 10 n 10log 10 f c 2 in band phase noise floor.
The loop continued until the noise floor was at or below the maximum permissible discrete spur level. For fractional mode it depends on the fraction. Noise is flat typically passed 15 or 20 mhz offset frequency and is called the noise floor of the source. The in band phase noise floor from the pll ic can be then determined by.
Adisimpll v3 3 and higher now models both. For newer pll devices we are actively improving our 1 f performance through design an example of this is the improvement in 1 f noise seen going from the adf4350 to the adf4351 pn1 f goes from 111dbc hz to 116dbc hz. The phase detector noise floor is estimated by measuring the in band noise at the vco output and subtracting 20 log n where n is the n divider value and 10 log fpfd where fpfd is the phase detector frequency. Phase noise floor measurement the basic phase lock loop configuration we will be consider ing is shown in figure 3.
Finally the phase noise typically scales with the output frequency so that half the frequency will improve the phase noise by 6 db. However the time savings came from the fact that if a violation was detected at a wider rbw. For wide loop bandwidths 50khz the normalized noise floor becomes important.
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