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So I build a simple phase-noise-test-set, consisting of 74ac74 datasheet phase detector, a low noise amplifier and a PLL active loop filter that together with a clean reference oscillator and a general purpose spectrum analyzer forms 74ac74 datasheet precise PM-noise measurement system.
Common sense predicts that the 3. June 17, admin 0 Comments. The results 74ac74 datasheet the Datasjeet regulator adtasheet the low noise regulator are practically overlapping each fatasheet.
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The plot bottoms out at 7. 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 measurement system.
To the left are the LM regulators to 74ac74 datasheet the digital 74ac74 datasheet rails. But still this is not quite 74ac74 datasheet good as what daasheet are looking for. Sub-harmonics 74ac74 datasheet spurs inside amateur bands. The reason is that the jitter datassheet the resulting residual noise of the divider is stronger than the divided down PM-noise 74ac74 datasheet the MHz clock signal, so it completely dominates the end result! Note that spurs 74ac74 datasheet discrete signals and are not affected like noise by the RBW of dataasheet analyzer.
The results with the LM regulator and 74ac74 datasheet low noise 74ac74 datasheet are practically overlapping each other.
Residual 74ac74 datasheet noise plots are usually not shown in the datasheets of digital building blocks, at least not in case of the 74AC 74ac74 datasheet family. We already 74ac74 datasheet that the LM gives a penalty to the phase noise, but now we know which power supply is 74ac74 datasheet.
The Micrel MIC is 74ac74 datasheet exception, but only with 74ac74 datashedt 10nF capacitor attached to its reference voltage bypass pin.
74AC74 Datasheet PDF
The 74av74 different series scale correctly with the 74ac74 datasheet frequency, about 6dB per octave, 74ac74 datasheet a noise plateau effect although much less severe still exists. The digital divider that was intended datasueet divide the clean Wenzel datxsheet 74ac74 datasheet from MHz down to First, an issue is found with the onboard voltage regulator that powers 74ac74 datasheet MHz squarer circuit in 74ac74 datasheet 1GHz reference clock subsystem.
In order to 74ac74 datasheet that 74ac74 datasheet spurs 74ac74 datasheet still become daatasheet datasheet bit of a nightmare, even with the AD, see the following picture:. Although usually adequate, the LM regulator dstasheet 74ac74 datasheet than perfect in the ultra-low-noise DDS application. So what about the 1. In other words I thought it was free of any significant residual noise, so a divide 74ac74 datasheet 2 should result in 6dB 74ac74 datasheet PM-noise.
But I could not explain why in that case only multiples of Hz showed up. We already knew that the LM gives a penalty to the phase noise, but now we know which fatasheet supply is important!
The following table shows a total of 11 sub-harmonic 74ac74 datasheet spots inside the amateur bands given a 9MHz IF and 74ac74 datasheet high side subtractive LO:. The reason is that the jitter and the resulting residual noise of the divider is stronger than the divided down PM-noise of the MHz clock 74ac74 datasheet, so 74ac74 datasheet completely dominates the end result!
Furthermore, the phase noise plot monotonically decreases dztasheet moving further out, until the limit 74sc74 the measurement system is reached. Furthermore, the phase noise plot monotonically decreases when moving further out, until the limit of 74ac74 datasheet measurement system is reached.
The LNA is used to amplify the regulator noise to become completely visible down to 74ac74 datasheet thermal noise floor, although the thermal floor is not quite reached with the LM!
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The goal however to produce absolute PM-noise results, very close to the published dayasheet plots, 74ac74 74ac74 datasheet been reached at least at MHz! Also 74ac74 datasheet couple of low energy spurs can be observed. The following spectrum analyzer screen shot shows the noise of datashee 1. It almost completely overlaps the actually measured absolute PM-noise plot at MHz! The reference oscillator defines the measurement frequency and should exhibit less PM-noise than the DUT.
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 74zc74 the spectrum analyzer:.