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Jauno metožu un rīku eksperimentālie pētījumi analogo signālu attēlošanā notikumu plūsmu veidā

This project focuses on the experimental development of a multifunctional signal time analyzer, including the design and investigation of the Signal Event Converter (SEC) module. The research aims to enhance measurement capabilities and implement auxiliary functionalities such as pulse width and rise/fall time measurements. The project is led by Dr. hab.sc.comp. Jurijs Artjuhs, with Jakovs Savarovskis as the consultant. The seminar took place in Riga on May 29, 2012.

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Jauno metožu un rīku eksperimentālie pētījumi analogo signālu attēlošanā notikumu plūsmu veidā

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  1. Jauno metožu un rīku eksperimentālie pētījumi analogo signālu attēlošanā notikumu plūsmu veidā ERAF projekts No. 2010/0283/2DP/2.1.1.1.0/10/APIA/VIAA/084 “Daudzfunkcionāla signālulaika analizatora eksperimentāla izstrāde" (SiLA) Projekta zinatniskais vaditājs Dr.hab.sc.comp. Jurijs Artjuhs referents Jakovs Savarovskis

  2. , Frequency Frequency ) Standard Standard PC PC Input Input Signal to Event Converter(Signal Conditioner) detector of zero crossings EVENT TIMER EVENT TIMER Signal Conditioner controllable prescaler A033 A033 - - ET ET Analyser Analyser software software Time Analyser ( Subject and objectives of research Research Objectives: • Measurement capabilities enhancement of the Time Analyzer • Design and investigation of the conditioner (SEC) module Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  3. What Signal to Event Converter (SEC) is for • Convert arbitrary signal to acceptable for measurement module pulse train • On each negative/positive/both edge of the signal at specified level • In predefined manner to implement auxiliary functionality (rise/fall time, narrow pulse width measurement) Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  4. 3 input channels Adjustable levels [-2V … +3V] I/O chanel switching Switching circuit for narrow pulse width measurements Switching circuit for rise/fall time measurements Structure Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  5. Setup and general functionality • Relative position of input signal edges • Adjustable levels • Edge selection (rising, falling, both) • Narrow pulse width and Rise/fall time (<Dead time of Event Timer) • Adjustable levels • Positivenegative pulse selection Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  6. Time Intervals (Start-Stop) Relative position of signal edges • Period • Frequency • Jitter • Pulse width • Duty Cycle >Dead time Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  7. Full timing diagram Instantaneous Period Time Tags Analysis • Statistical quantities • Mean, σ, min, max • Spectrum, Histogram • Modulation, Jitter analysis Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  8. Some measurement examples AFG3252 Time intervals AFG3252 PJ-Frequency Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  9. Period deviation → Frequency deviation FM analysis 3.3MHz carrier signal; 500Hz deviation (period deviation - 45.9ps) Characterizes modulation frequency and its deviation Reveals frequency deviation less than 0.1 Hz Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  10. Amplitude modulation is detected by adjustment of comparison level AM analysis 3.3MHz carrier signal; 5% AM depth Reveal AM modulation depth less than0.1% Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  11. AM+FM analysis Crossing level adjustment of the SEC mostly effects AM signals. SEC Level change 3.3MHz signal with 28 Hz frequency deviation (modulation frequency 10 KHz) + 1% AM depth (modulation frequency 20KHz) Distinguishes AM and FM spectral components of the signal Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  12. Narrow pulse width measurement of a pulse train Less than 800ps mean pulse width measurements Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  13. ... Narrow pulse width measurement of a pulse train (2) • Estimation of every secondpulse width of a pulse train Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  14. Narrow pulse width measurement of a pulse train (3) CCJ • Signal period instability influence on pulse width measurement error • Pulse width measurement error can be estimated during the measurement Minimal acceptable pulse width determined by : (at 10% relative error) period instability less than 800ps minimum input pulse width of comparator Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  15. Narrow pulse width measurement of a pulse train (4) Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  16. Rise/fall time measurement of a pulse train Less than 100ps mean rise/fall time measurements Informatīvais seminārs, Rīga, 2012. g. 29. maijs

  17. Summary • Relatively simple single channel solution allows multiple signal parameter measurement and analysis • High precision measurements • <800ps Pulse width measurement • <100ps rise/fall time measurement • Signal modulation analysis Informatīvais seminārs, Rīga, 2012. g. 29. maijs

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