1 / 17

Jitter and Phasenoise Devices simulation

Jitter and Phasenoise Devices simulation. Jitter is a measurement of the variations in the time domain, and essentially describes how far the signal period has wandered from its ideal value. Typically, deviations below 10 MHz are not classified as jitter, but as wander or drift.

menefer
Download Presentation

Jitter and Phasenoise Devices simulation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Jitter and Phasenoise • Devices • simulation

  2. Jitter is a measurement of the variations in the time domain, and essentially describes how far the signal period has wandered from its ideal value. Typically, deviations below 10 MHz are not classified as jitter, but as wander or drift. Phase noise is a frequency-domain view of the noise spectrum around the oscillator signal, while jitter is a timedomain measure of the timing accuracy of the oscillator period Problem: There exist many similar definitions – same word describes different things!

  3. Absolute jitter: It is given by the sum of each periods variation from the average Period jitter:simply measures the period of each clock cycle in the waveform Cycle-to-cycle jitter: This is the jitter definition that most people mean when they talk about jitter as a single number. It measures the variance of each period to the average period:

  4. Phasenoise: Measuring phasenoise

  5. Translating between phasenoise and jitter The total noise power of the sidebands can be determined by integrating the L(f) function over the band of interest - in this case, 12 KHz to 10 MHz. This might be for example be the case if low frequency noise = ”‘slow”’drifts are not of importance.

  6. What are our frequency - boundaries? • TTC (Timing, Trigger and Control) is only the delivery system: Info about timing to beam?

  7. Pulsed BBLR: Load: L = Zin/2f of 840nH. Design strategy

  8. Remo Maccaferri • – has specs, thinking of avalache devices (as far as I know) advantage: high current, fast switching, disadvantage: lifetime, fuzzy status, problematic to turn off • 2) M. Paoluzzi • - no avalanche devices (fuzzy state, but knows he is no expert on them) • - he thinks its possible to meet the specs with: • Transitor:polyfet rf devices - F1401 • Gatedriver: IXYS- IXDD415SI • -spice models avaiable, to be tested.

  9. Simulations: SPS – DA as function of beam-wire distance - which law? The simulated dependance on the beam-wire distance is fitted by y = a*x^b + c, where a = 0.188, b = 1.836, c = 0.06768 -> The dependance always follows a power law.

  10. - > Can we make test the power law in the SPS at different tunes?

  11. RHIC

  12. Blue beam - L45, LR(s=0), t-comp, Qx=28.733, Qy=29.722 No sextupoles including sextupoles

  13. Tune from one turn map ( included in BBTrack 5.3.0.3) Example: an instable particle

  14. Is the tune difference a valid Lyaponov-function? • -> seams easier to detect. • What are the frequencies? Chromaticity=0, no sextupoles, offmomentum

  15. Next steps • Chromaticity tuneshift? • Tune variation fue to coupling • ….

More Related