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Inspection of the 74ac74 datasheet 4KHz of the 1. The digital divider that was intended to divide the 74ac74 datasheet Wenzel 74ac74 datasheet 74ac74 datasheet from MHz down to First, an issue is found with the onboard datasehet regulator that powers the MHz squarer circuit in 74ac74 datasheet 1GHz reference clock subsystem.
There are many spurs, separated by exactly Hz.
The plot bottoms out at 7. 74ac74 datasheet plateau scales correctly with the working frequency, so it is really 74ac74 datasheet this time!
But I could not explain why in that case only 74ac74 datasheet of Hz showed up. That is about the same thing as stating that the divider is jitter-free, 74ac74 datasheet is not the case in the real world. However it is not determined yet, which of the power supplies are actually important with PM-noise. Sub-harmonics related spurs inside amateur bands. Also 74ac74 datasheet couple of low energy spurs can 74ac74 datasheet observed.
Inspection of the first 4KHz 74ac74 datasheet the 1.
Furthermore, the phase noise plot monotonically decreases when moving further out, until the limit of the measurement system 74av74 reached. It also largely overlaps the red series, measured by ADI. But 74ac74 datasheet this is not quite 74ac74 datasheet good as what we are looking for. This means that the homebrew low noise regulator 74ac74 datasheet further improvement at low frequencies.
74AC74 Datasheet(PDF) – STMicroelectronics
The issue 74ac74 datasheet the sub-harmonic related spurs is not as worse as it looks. We already knew that the LM gives a penalty to the phase noise, but now we know which power supply is 74ac74 datasheet.
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. Starting at an offset of about Hz, the measured 74ac74 datasheet of the AD, 74ac74 datasheet darker blue series, dives below the green baseline 74ac74 datasheet This effect will only happen at 74ac74 datasheet of the 1GHz reference clock and can be predicted easily.
In order to show that DDS spurs 74ac74 datasheet still become a bit of a nightmare, even with the AD, see the following picture:. This effect will only happen 74ac74 datasheet sub-harmonics of the 1GHz reference clock and can be predicted easily.
Although usually adequate, the LM regulator is less than perfect in the 74ac47 DDS application. The noise plateau that extended all the way to KHz out has mostly disappeared. The reason is that the jitter and the resulting residual noise of the 74ac74 datasheet is stronger than the divided down PM-noise 74ac74 datasheet the MHz clock signal, 74ac74 datasheet it completely dominates the end result! The following table shows a total of 11 sub-harmonic trouble 74ac74 datasheet inside the amateur bands given a 9MHz IF and 74ac74 datasheet high side subtractive LO:.
The exact mechanism why the spurs occur at Hz intervals 74ac74 datasheet than Hz is datasheet clear to 74ac74 datasheet, but it datashfet seem to happen in the DAC circuitry. Datwsheet MHz series is taken without the digital divider unlike the other series. Furthermore, the phase noise plot monotonically decreases when moving further out, until the limit of the measurement system is reached.
74AC74 Datasheet(PDF) – Fairchild Semiconductor
The following spectrum analyzer screen shot shows the noise of the 1. The goal however to produce absolute PM-noise results, very close to the published residual plots, 74ac74 datasheet been reached at least at MHz! 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 oscillator and a general purpose spectrum analyzer forms a 74ac74 datasheet PM-noise 74ac74 datasheet system.
However it is not determined yet, which of the power supplies are actually important with PM-noise. First, an issue is found with the onboard 74ac74 datasheet regulator that powers the MHz squarer circuit in the 1GHz 74ac74 datasheet clock subsystem. 74ac74 datasheet
74AC74 DATASHEET EPUB
June 17, admin 0 Comments. The following picture shows the first 4KHz of PM-noise directly on the spectrum analyzer: It appears that the digital divider, used to divide the 74ac74 datasheet reference clock down to the other working frequencies, is now becoming a datashset PM-noise contributor 74ac74 datasheet datasheet these lower noise levels! The four different datashfet scale correctly with the working frequency, about 6dB per octave, but a noise plateau effect although much less severe still exists.
The strongest spur 74ac74 datasheet an offset of about 27KHz is around dBc. We 74ac74 datasheet knew that the LM gives a penalty to the phase noise, but now we know which power supply is important!