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INC151 Circuit Analysis by Engineering’s Software Practice

INC151 Circuit Analysis by Engineering’s Software Practice. Lecture 5 Frequency Response Analysis (AC Sweep). Switches. Sw_tClose switch close at t=? Sw_tOpen switch open at t=?. 3-way switches. We can make a 3-way switch by combining NO and NC switches together. Example. IC=0.

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INC151 Circuit Analysis by Engineering’s Software Practice

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  1. INC151 Circuit Analysis byEngineering’s Software Practice Lecture 5 Frequency Response Analysis (AC Sweep)

  2. Switches Sw_tClose switchclose at t=? Sw_tOpenswitch open at t=?

  3. 3-way switches We can make a 3-way switch by combining NO and NC switches together.

  4. Example IC=0 Plot and findVc(t) at t = 40ms

  5. Transient Analysis • Frequency Response Analysis (AC Sweep) Transient Response: plot time asX axis Frequency Response:plot frequency asX axis Frequency response is used when we are asked about the relationship of voltage/current and frequency

  6. Frequency Response Mode • Choose “AC Sweep” in • menu setup analysis • set range offrequency • that we want to sweep • Phase marker

  7. Markers • Mark Voltage – shows node voltage • Mark Voltage Differential – difference voltage • between 2 nodes • 3. Mark Current into pin – show current flow into • a components

  8. Mark Advanced • vdb/idb – show voltage/current in decibel unit • vphase/iphase - show phase shift of the sine wave

  9. More Components • VAC AC voltage sourcefor • frequency response analysis • (AC sweep) • has 2 parameters: • ACMAG • ACPHASE

  10. Example AC sweep Range 100 – 1000KHz What is the voltage across the inductor at frequency = 500 and 20K Hz? Ans: 31.4mV and 782.47mV

  11. Compare to Transient Mode VSIN VOFF = 0 VAMPL = 1 FREQ = 500 20K Range 0-4ms Step 0.1us See the amplitude

  12. Log scale Log scale axis (decade) is used to clearly see the effect of full range frequency In frequency response plot, we usually plot it in the log scale.

  13. Example How muchfrequency make the magnitude of Vc = 0.1V ?

  14. ex19 Example How much frequency make magnitude of Vc the greatest? and how much is that magnitude?

  15. ex20 Example Plot both Magnitude and Phase Range 10Hz – 20KHz

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