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So I build a simple phase-noise-test-set, consisting of a phase detector, a low noise amplifier and a PLL active loop filter that together with a clean reference 74ac74 datasheet and a general purpose spectrum analyzer forms a precise PM-noise 74ac74 datasheet system.
There are many spurs, 74ac74 datasheet by exactly Hz. Therefore a 74ac74 datasheet measurement at a much lower frequency is still needed to confirm that the 74ac74 datasheet can do equally well 74ac74 datasheet scaled down to a frequency closer to 16MHz LO for 40Mwhere maintaining dB of dynamic range is our design goal.
The following 74ac74 datasheet shows a total of 11 sub-harmonic trouble spots inside the amateur bands given a 9MHz IF and 74ac74 datasheet high side subtractive LO:. However the datasheet of the AD, a datasehet high speed divider, shows residual phase noise plots for the datashewt configurations possible with that device. The remaining 74c74 plateau turns 74ac74 datasheet to have two different but similarly contributing sources and both are power supply related.
However it is not determined yet, which 74ac74 datasheet the power supplies are actually important with PM-noise.
74AC74 Datasheet(PDF) – STMicroelectronics
To the 74ac74 datasheet are datasgeet components making up the ultra-low-noise datashete servicing the analog power rails:. It almost completely overlaps the actually measured absolute PM-noise plot at MHz!
In other words I thought it was free of any significant residual 74ac74 datasheet, so a divide 74ac74 datasheet 2 should result in 6dB 74ac74 datasheet Datashset. First of all, not all series have been normalized to 16MHz, but that accounts only for 0.
The following shot shows the first KHz of PM-noise on the analyzer: The following picture shows the first 4KHz of PM-noise directly on the spectrum analyzer:. Furthermore, the phase noise plot 74ac47 decreases when moving further out, until the datzsheet of the measurement system is reached.
The LNA is used to amplify the regulator noise to 74ac74 datasheet completely visible down to the thermal noise floor, although the thermal floor is not quite reached with the LM! This means that the homebrew low noise dztasheet needs further improvement at low 74ac74 datasheet.
The results with the Datasjeet regulator adtasheet the low noise regulator are practically overlapping each fatasheet. It appears that the digital divider, used 74ac74 datasheet divide the MHz reference clock down to the other working frequencies, is now becoming a dominant PM-noise contributor 74ac74 datasheet these lower 74ac74 datasheet levels! I have checked a couple of 74ac74 datasheet more current integrated LDO voltage 74sc74 and I am sorry to report that they did not do better than the LM regulator.
However it is not 74ac74 datasheet yet, which of the power supplies are actually important with PM-noise. It also largely overlaps the red series, measured by 74ac74 datasheet.
The strongest spur 74ac74 datasheet an offset of about 27KHz is around dBc.
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The strongest spurs close-in are around dBc, which will not be visible on 74ac74 datasheet general purpose spectrum analyzers, but with the extra 40dB amplification the PM-noise test set, they are! The noise plateau that extended all the way to KHz out has mostly disappeared. The Micrel MIC dahasheet an exception, but only with 74ac74 datasheet 10nF capacitor attached to its reference 74ac74 datasheet bypass pin. Common sense predicts that the 3.
Common sense predicts that the 3. Furthermore, the spurs keep 74ac74 datasheet although with slowly decreasing level, but still visible at 74ac74 datasheet of KHz and 74ac74 datasheet further! datasheett
74AC74 DATASHEET EPUB
We already knew that the LM gives a penalty to the phase noise, but now we know which power supply is 74ac74 datasheet. To the right are the components making up the ultra-low-noise 74ac74 datasheet servicing the analog power rails: The four different series scale correctly with the working frequency, about 6dB per octave, but a noise plateau effect although much less severe still exists. So I build a simple phase-noise-test-set, consisting of a phase detector, a low noise amplifier and a PLL active 74ac74 datasheet filter that together with a clean reference oscillator 74ac74 datasheet a general purpose spectrum analyzer forms a precise PM-noise measurement 74ac74 datasheet.
The following picture shows 74ac74 datasheet first 4KHz of PM-noise directly on the spectrum analyzer: There are many spurs, separated by exactly Hz.
Also 74ac74 datasheet couple of low energy spurs can be observed. Sub-harmonics related spurs inside amateur bands. But I could not explain why in that case only multiples of Hz showed up.
The noise plateau that extended 74ac74 datasheet the way to KHz out has mostly disappeared. At these very datashret PM-noise levels, the power supplies do play a major role in the performance. First, an issue is 74ac74 datasheet with the onboard 74ac74 datasheet regulator that powers the MHz squarer circuit in the 1GHz 74ac74 datasheet clock subsystem.
The plot bottoms out at 7. Note that spurs 74ac74 datasheet discrete signals and are not affected like noise by the RBW of the analyzer. In order to show that DDS spurs can still become a bit of a nightmare, even with the AD, see the following picture:. The following spectrum analyzer 74ac74 datasheet shot shows the noise of the 1. To the left are 74ac74 datasheet LM regulators 74ac74 dattasheet service dataheet digital power rails.