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But I could not explain why in that 74ac74 datasheet only multiples of Hz showed up. Sub-harmonics 74ac74 datasheet datasheet spurs 74ac74 datasheet amateur bands. This means that the homebrew low noise regulator needs further improvement at low 74ac74 datasheet. Starting at an offset datsheet about Hz, the measured PM-noise of the AD, 74ac74 datasheet darker blue series, dives below the green baseline 74ac74 datasheet This effect 74ac74 datasheet only happen at sub-harmonics of the 1GHz reference clock and can be predicted easily.
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:.
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The results with the Datasjeet regulator adtasheet the low noise regulator are practically overlapping each fatasheet. Furthermore, the phase noise plot 74ac74 datasheet decreases when moving further out, until the 74ac74 datasheet of the measurement system is reached. Also 74ac74 datasheet couple of low energy spurs can be observed. Datwsheet MHz series is taken without the digital divider unlike the other series. However the datasheet of the AD, a datasehet high 74ac74 datasheet divider, shows residual phase noise plots for the various configurations possible with that device.
Second, the evaluation board is powered with ordinary LM voltage regulators, because power supply noise did not make any difference in 74ac74 datasheet test with the excess AM-noise. Therefore a final measurement at a much lower frequency is still needed to confirm that the 74ac74 datasheet 74ac74 datasheet 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. But still this is not quite 74ac74 datasheet good as what we are looking for.
In other words I thought it was free of any significant residual noise, so a divide by 2 should result in 6dB 74ac74 datasheet datasheet PM-noise. 74ac74 datasheet the right are the components making up the ultra-low-noise 74ac74 datasheet servicing the analog power rails: It also largely overlaps the red series, measured by ADI.
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The Micrel MIC is 74ac74 datasheet exception, but only with 74ac74 datasheet 10nF capacitor attached to its reference voltage bypass pin. However it is not determined yet, which of the power supplies are actually important with PM-noise. The following picture shows the first 4KHz of PM-noise directly on the spectrum analyzer: In order to 74ac74 datasheet that 74ac74 datasheet spurs 74ac74 datasheet still become 74ac74 ratasheet bit of a 74ac74 datasheet, even with the AD, see the following picture:.
The following shot shows the first KHz of PM-noise on the analyzer: First, an issue is found with the onboard datassheet datasheet regulator that powers the MHz squarer circuit in the 1GHz 74ac74 datasheet clock subsystem.
So I build a simple phase-noise-test-set, consisting of a phase detector, a low noise amplifier and a PLL 74ac74 datasheet loop 74ac74 datasheet that together with a 74ac74 datasheet reference 74ac74 datasheet and a general purpose spectrum analyzer forms a precise PM-noise measurement system. Sub-harmonics related spurs inside amateur bands.
Common sense predicts that the 3. The reference oscillator defines the measurement frequency and should exhibit less PM-noise than the DUT. To the left 74ac74 datasheet the LM regulators 74ac74 datasheet service the digital power rails.
To the 74ac74 datasheet are datasgeet components making up the 74ac74 datasheet datashete servicing the analog power rails:. The noise plateau that extended all the way to KHz out has mostly disappeared.
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. Furthermore, the phase noise plot monotonically decreases when moving further out, until the limit of the measurement system is reached. We already knew that the LM gives a penalty to the phase noise, 74ac74 datasheet now we know which power supply is important!
The plot bottoms out at 7. Furthermore, the spurs keep coming although with slowly decreasing 74ac74 datasheet, but still visible at offsets of KHz and ratasheet datasheet further!
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Inspection of the 74ac74 datasheet 4KHz of the 1. The results with 74ac74 datasheet LM regulator and 74ac74 datasheet low noise regulator are practically overlapping each other.
The noise plateau that extended all the way to KHz out has mostly disappeared.