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CPE 221 Introduction

CPE 221 Introduction. What is “Electronics”?. Electric circuit. Connections of conductive wires and passive devices. Electronics circuit. Electric circuit that contains both passive and active devices. CPE 221 Introduction. Passive devices. Resistor.

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CPE 221 Introduction

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  1. CPE 221 Introduction What is “Electronics”? Electric circuit Connections of conductive wires and passive devices Electronics circuit Electric circuit that contains both passive and active devices

  2. CPE 221 Introduction Passive devices Resistor Voltage-current relation: V = R I, v(t) = R i(t) Inductor Voltage-current relation: v(t) = L di(t)/dt Capacitor Voltage-current relation: i(t) = C dv(t)/dt

  3. CPE 221 Introduction Active devices Diodes Bipolar junction transistors (BJT) Field-effect transistors (FET)

  4. CPE 221 Introduction Active devices (Cont’d) Linear integrated circuits Operational amplifiers Other solid-state devices

  5. CPE 221 Introduction Basic circuit analysis KCL Summation of currents flow in to (or out from) a node is zero KVL Summation of voltages across all elements in a mesh is zero Norton and Thevenin equivalent circuits A two-terminal network can be represented as a current source connected in parallel with Norton’s equivalent resistance (or a voltage source connected in series with Thevenin’s equivalent resistance)

  6. V2 V3 V1 CPE 221 Introduction Example: Use KCL to find all node voltages 8V1 + 10V2 + 5V3 = 1000 SN 1,2&3: 5 - V1/25 - V2/20 - V3/40 = 0 V2 = V1 + 60 Voltage source 60V: V1 - V2 = -60 V3 = V1 - 100 Voltage source 100V: V1 - V3 = 100 Therefore, 8V1 + 10(V1+ 60) + 5(V1 - 100) = 1000 V1 = ?, V2 =?, V3 = ?

  7. i4 i1 i2 i3 CPE 221 Introduction Example: Use KVL to find all mesh currents

  8. CPE 221 Introduction Example: Find Thevenin’s and Norton’s equivalence of the circuit below:

  9. CPE 221 Introduction Homework, Lab and Project policy Homework assignments due every week( about 10) Lab assignments due every other week (about 6) Project assignments due every four week (about 4)

  10. CPE 221 Introduction Homework Assignment 1 Circuit analysis (KCL, KVL) Connections of conductive wires and passive devices Thevenin and Norton Equivalent circuits Electric circuit that contains both passive and active devices

  11. CPE 221 Introduction Lab Assignment 1 Simulation of simple circuits Select a circuit containing passive devices and use a simulation program(i.e., EWB, Protheus, etc) to simulate its behavior

  12. CPE 221 Introduction Project topics Projects are not limited to the following topics. Students are free to propose others. Class A amplifier Class B amplifier Class C amplifier Class D amplifier Dimmer Switching power supply Voltage regulator Motion detection DC Motor control

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