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Overview of Controlled Sources and Circuit Analysis Activities for ECSE 2010 Spring

This document outlines essential assignments, in-class activities, and resources for the ECSE 2010 course at RPI during Spring 2003. Key topics include the role of controlled sources in circuit analysis, such as voltage and current-controlled sources, and their applications in modeling electronic devices like transistors and amplifiers. Students are provided with homework assignments, instructions for PSpice simulation practice, and insights into using potentiometers for variable resistance in experiments. Insightful activities like KVL and equivalent resistance calculations are part of the learning process.

colleen-liddane
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Overview of Controlled Sources and Circuit Analysis Activities for ECSE 2010 Spring

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  1. ELECTRIC CIRCUITSECSE-2010Spring 2003Class 4

  2. ASSIGNMENTS DUE • Today (Tuesday/Wednesday): • HW #1 Due • Activities 4-1, 4-2, 4-3 (In Class) • 4-2 in NOT in your Supplement • Thursday: • Activities 5-1, 5-2, 5-3 (In Class) • Next Monday: • HW #2 Due • Experiment #1 Report Due • Activities 6-1, 6-2, 6-3, 6-4 (In Class)

  3. WEBSITE • Main Website: http://www.ecse.rpi.edu • Academics • Course Homepages • Spring 2003 – ECSE 2010 • Backup Site : http://128.113.60.136/ECSE-2010/index.html

  4. TA’S • Section 1: • Tong Zhang (zhant@rpi.edu) • Section 2: • Amit Kekare (kekara@rpi.edu) • Rahul Kalaskar (kalasr@rpi.edu) • Section 3: • Sunil Rao (raos@rpi.edu) • Shahab Uddin (uddins@rpi.edu)

  5. GRADING ASSIGNMENTS • Activities: • Amit Kekare – Sections 1&3 • Rahul Kalaskar – Section 2 • Experiments: • Sunil Rao • Homework: • Shahab Uddin • Computer Projects: • Tong Zhang

  6. REVIEW • PSpice: • Download a copy and start practicing • http://www.cadencepcb.com/products/downloads/PSpicestudent/default.asp • Practice with Activities, Homework, etc. • Get comfortable with “rules” for Circuit Files and Learn to use Schematics • We will slowly build our list of commands

  7. MORE CIRCUIT ELEMENTS • Potentiomenter: • Variable Resistor with 3 terminals • Resistance varies as shaft is turned • Will Use Digital Pots in our Experiments • Controlled or Dependent Sources: • Source whose Voltage or Current Output Depends on a Voltage or Current Somewhere Else in the Circuit

  8. POTENTIOMETER

  9. CONTROLLED SOURCES • 2 Types of Sources for Circuit Models: • Independent Voltage and Current Sources • Usually Model with Ideal Sources • Controlled Voltage and Current Sources • Also called Dependent Sources • Controlled/Dependent Source: • Voltage or current source whose value depends on the v or i at some other point in the circuit • Cannot buy a controlled source! • Used to model the behavior of electronic devices • Controlled Sources Make Ckt Analysis Much, Much Harder!

  10. CONTROLLED SOURCES • Controlled Source cannot be the only source of Energy in a complete circuit • Need an Independent Source to create the controlling current or voltage • All circuit models for Transistors and other Electronic Devices involve Controlled Sources • Whole field of analog electronics is based on controlled sources

  11. CONTROLLED SOURCES

  12. CONTROLLED SOURCES • See Example: • Special Symbol for Controlled Sources • Diamond • 4 Types of Controlled Sources • Voltage Controlled Voltage Source (VCVS) • Voltage Controlled Current Source (VCCS) • Current Controlled Voltage Source (CCVS) • Current Controlled Current Source (CCCS) • See Examples:

  13. CONTROLLED SOURCES

  14. CONTROLLED SOURCES

  15. CONTROLLED SOURCES

  16. CONTROLLED SOURCES

  17. CONTROLLED SOURCES USING SCHEMATICS

  18. ACTIVITY 4-1

  19. ACTIVITY 4-1 • KVL: • v - i R + 6 i = 0 => v = i (R - 6) • i = v / (R - 6) • Note: Singularity at R = 6!; Current “blows up” • Interesting things can happen with controlled sources • vc = 6 i = 6 v / (R - 6) • Controlled source tries to put out infinite voltage when R ~ 6 ohms • What really happens is that circuit model fails

  20. ACTIVITY 4-1 • Equivalent Resistance “Seen” by Source: • Req = v / i • Req => 0 as R => 6 ohms • Controlled sources allow much more interesting things to happen, but make circuit analysis much harder

  21. ACTIVITY 4-1 • v = 20 Volts

  22. APPLICATION OF CONTROLLED SOURCES • Controlled Sources are used to Model the Behavior of Electronic Devices • Single devices such as Transistors • Complete circuits such as Amplifiers • A good Example is given in Section 4.1 of your Text – Design Challenge • Uses a Potentiometer and an Amplifier • Models Audio Control on Stereo • Let’s take a quick look at this – Activity 4-2

  23. POTENTIOMETER

  24. VOLTAGE AMPLIFIER

  25. ACTIVITY 4-2

  26. ACTIVITY 4-2

  27. ACTIVITY 4-2

  28. ACTIVITY 4-2

  29. ACTIVITY 4-2

  30. EQUIVALENT RESISTANCE

  31. EQUIVALENT RESISTANCE • LOAD Network: • Any Circuit with R’s and Controlled Sources • No Independent Sources • See Example: • Define v, i using Passive Convention • Req = v / i • Can Replace Any Load Network with its Req • Powerful Ckt Analysis Technique • See Example

  32. EQUIVALENT RESISTANCE

  33. Req With Controlled Sources • “Connect” Test Voltage, vt: • Independent Source (Active Element) • Define it using Active Convention • Use Ckt Analysis to find it in terms of vt: • Linear equation relating it to vt • 1 Equation; 2 Unknowns • Req = vt / it: • See Example

  34. Req with Controlled Sources

  35. Req with Controlled Sources

  36. Req with Controlled Sources

  37. ACTIVITY 4-3 • Electronic devices allow for “amplification” of a current or voltage: • Make it bigger or smaller • Will examine in more detail soon • Model electronic devices with controlled sources • Models will use controlled sources with “Variable Gain”: • Variable depends on characteristics of the particular electronic device being used • Usually want to solve general circuit - then put in characteristics of particular device - from spec’s

  38. ACTIVITY 4-3

  39. ACTIVITY 4-3 • Part a): KVL • Part b): “Supernode” around

  40. ACTIVITY 4-3

  41. ACTIVITY 4-3 • Part c):

  42. ACTIVITY 4-3 • Part d): • .2 A source in parallel with 10 ohms • Model Amplifier with Rin

  43. ACTIVITY 4-3

  44. ACTIVITY 4-3

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