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EE 211 Lecture 5

EE 211 Lecture 5. T. H. Ortmeyer Spring, 2006. This week’s labs. Aliasing and Pulse Measurements 555 Timers Important Note: Next weeks schedule. Comments on WA#2. Tables were much improved Those who didn’t get all three data points– what do you do?

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EE 211 Lecture 5

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  1. EE 211 Lecture 5 T. H. Ortmeyer Spring, 2006

  2. This week’s labs • Aliasing and Pulse Measurements • 555 Timers • Important Note: Next weeks schedule

  3. Comments on WA#2 • Tables were much improved • Those who didn’t get all three data points– what do you do? • Discussion point– don’t just talk about the error • Relate back to the predictive equation • Lead resistance is a stretch in this case

  4. Sampling Theorem

  5. Aliasing If the sampling theorem is violated, aliasing occurs— An illustrated on the web site http://www.dsptutor.freeuk.com/aliasing/AD102.html

  6. Labview “canned” programs • Acquire Waveform.vi • Investigate aliasing

  7. Pulse waveform qualities • Amplitude • Maximum • Rise time • Fall time • Pulse width

  8. The ideal pulse train

  9. The actual pulse train

  10. Most circuits

  11. Response to a step input

  12. where

  13. Goal • We will measure the effect of varying frequencies on rise times, overshoot, damping, etc. • Rules of thumb for strays— • Inductance ~10 nanohenries/inch • Capacitance– in the pfd range • The effect of frequency—hz and mH, khz and uH, Mhz and nH have similar effects

  14. 555 Timers

  15. Astable mode

  16. Cap voltage and output voltage

  17. Capacitor charging

  18. Capacitor Discharge

  19. Astable mode • Charge from Vcc/3 to 2Vcc/3– this takes t1 = 0.693 (RA + RB)*C • Discharging from 2Vcc/3 to Vcc/3 this takes t2 = 0.693 RB*C • The period is T=t1+t2

  20. Labs 10 and 11 • We will investigate the astable and monostable modes with Labview modules in Lab 10. • We will build the astable mode in Lab 11.

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