diode circuit analysis

Diode Circuit Analysis

ELEC 121

January 2004 ELEC 121 2

Diode Circuit Analysis• Diode Circuit Analysis

– Graphical Analysis using Loadlines– Analytical Analysis using KVL and KCL

• LEDs• Zener Diodes• Diode Resistance

– Static Resistance RD

– Dynamic Resistance rd

– Average Resistance rdav

• Diode Characteristic Curves• Simulation

January 2004 ELEC 121 3

Series Diode Configuration

January 2004 ELEC 121 4

Drawing a Load Line to Find the Q Point .

January 2004 ELEC 121 5

Diode Circuit and Characteristics .

January 2004 ELEC 121 6

Load Line Example

January 2004 ELEC 121 7

Determining the Unknown Network Quantities

January 2004 ELEC 121 8

Network Example

January 2004 ELEC 121 9

Determining the Unknown Network Quantities

January 2004 ELEC 121 10

Network Example

January 2004 ELEC 121 11

Zener Diode Equivalents

January 2004 ELEC 121 12

Basic Zener Regulator

January 2004 ELEC 121 13

Determining the State of the Zener

January 2004 ELEC 121 14

The Zener Equivalent Circuit Operation

January 2004 ELEC 121 15

Zener Diode Regulator

January 2004 ELEC 121 16

Determining V for the Regulator

January 2004 ELEC 121 17

Q-Point for the Network

January 2004 ELEC 121 18

Network in the conducting state