Cct. Models for semiconductor diodes

Slides:

Advertisements

Similar presentations

Lecture 6 Solid-State Diodes and Diode Circuits

Advertisements

Diode Circuits.

© The McGraw-Hill Companies, Inc McGraw-Hill 1 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I C.

Registered Electrical & Mechanical Engineer

Diodes and diode equation

EECS 40 Fall 2002 Copyright Regents of University of California S. Ross and W. G. Oldham 1 LECTURE 14 Today: Summary of Linear and Nonlinear Rules Load-line.

EECS 42, Spring 2005Week 3a1 Announcements New topics: Mesh (loop) method of circuit analysis Superposition method of circuit analysis Equivalent circuit.

Slide 1EE100 Summer 2008Bharathwaj Muthuswamy EE100Su08 Lecture #5 (July 2 nd 2008) Outline –Questions? –Lab notes: Labs 2 and 3 have been shortened Monday.

Module 1: Part 1 Semiconductor Materials and Diodes.

Slide 1EE40 Fall 2009Prof. Cheung EE40 Final Exam Review Prof. Nathan Cheung 12/01/2009 Practice with past exams

Chapter 20 AC Network Theorems.

Circuit Theorems VISHAL JETHAVA Circuit Theorems svbitec.wordpress.com.

1 Mao-Hsu Yen Electrical Engineering.

Lecture 27 Review Phasor voltage-current relations for circuit elements Impedance and admittance Steady-state sinusoidal analysis Examples Related educational.

9/13/2004EE 42 fall 2004 lecture 6 Lecture #6 methods of solving circuits Nodal analysis Graphical analysis In the next lecture we will look at circuits.

Electronic Circuit Analysis and Design Second Edition

Semiconductors and Diodes

L14 § 4.5 Thevenin’s Theorem A common situation: Most part of the circuit is fixed, only one element is variable, e.g., a load: i0i0 +  +  The fixed.

Clippers & Clampers Zener diode application. Clippers Clippers or diode limiting is a diode network that have the ability to “clip” off a portion on the.

PowerPoint of Figures and Tables Principles and Applications of Electrical Engineering Fifth Edition Chapter 9 Semiconductors and Diodes.

COMSATS Institute of Information Technology Virtual campus Islamabad

ELECTRICA L ENGINEERING Principles and Applications SECOND EDITION ALLAN R. HAMBLEY ©2002 Prentice-Hall, Inc. Chapter 10 Diodes Chapter 10 Diodes 1. Understand.

9/15/2004EE 42 fall 2004 lecture 7 Lecture #7 Graphical analysis, Capacitors Finish graphical analysis Capacitors Circuits with Capacitors Next week, we.

© The McGraw-Hill Companies, Inc McGraw-Hill 1 PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION G I O R G I O R I Z Z O N I C.

EE 221 Review 2 Nodal and Mesh Analysis Superposition Source transformation Thevenin and Norton equivalent Operational Amplifier.

Dr. Mustafa Kemal Uyguroğlu

3.1. Introduction Step to analyze AC Circuits: 1.Transform the circuit to the phasor or frequency domain. 2.Solve the problem using circuit techniques.

Recall-Lecture 4 Current generated due to two main factors

Chapter 20 AC Network Theorems. Superposition Theorem The voltage across (or current through) an element is determined by summing the voltage (or current)

ELECTRICAL ENGINEERING: PRINCIPLES AND APPLICATIONS, Third Edition, by Allan R. Hambley, ©2005 Pearson Education, Inc. Chapter 10 Diodes.

MALVINO Electronic PRINCIPLES SIXTH EDITION.

Diode Circuit Analysis ENGI 242 ELEC February 2005ENGI 242/ELEC 2222 Diode Circuit Analysis –Graphical Analysis using Loadlines –Analytical Analysis.

PN Junction Diode ENGI 242 ELEC 222. January 2004ENGI 242/ELEC 2222 PN Junction Diode Diode Model Analysis –Ideal –Approximation –Exact Diode Specification.

BASIC SEMICONDUCTOR ELECTRONIC CIRCUITS Introduction of two basic electronic elements: diode and transistor LEARNING GOALS Diodes structure and four modeling.

Fundamentals of Electric Circuits Chapter 4

CHAPTER 3 NETWORK THEOREM

Chapter 10 Diodes. 1. Understand diode operation and select diodes for various applications. 2. Analyze nonlinear circuits using the graphical load-line.

1 ELCT Class performance (Quizzes 1&2 and Midterm)

ECE 4991 Electrical and Electronic Circuits Chapter 3.

Chapter 6(b) Sinusoidal Steady State Analysis

CHAPTER 3 Resistive Network Analysis. Figure Branch current formulation in nodal analysis.

Voltage Regulator Circuits

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. MALVINO & BATES SEVENTH EDITION Electronic PRINCIPLES.

Diode Circuit Analysis Techniques Section 4.3. In this Lecture, we will:  Examine dc analysis techniques for diode circuits using various models to describe.

Prepared by: Garima Devpriya ( ) Jamila Kharodawala ( ) Megha Sharma ( ) ELECTRONICS DEVICES AND CIRCUITS G.H.Patel.

SOURCE TRANSFORMATION

Circuit Theorems Eastern Mediterranean University 1 Circuit Theorems Mustafa Kemal Uyguroğlu.

Series-Parallel Circuits. Most practical circuits have both series and parallel components. Components that are connected in series will share a common.

Diode Circuit Analysis

CSE251 Lecture3 Semiconductor Diodes.

Circuit Theorems 1.  Introduction  Linearity property  Superposition  Source transformations  Thevenin’s theorem  Norton’s theorem  Maximum power.

Source Transformation

Resistance & Nonlinearity of Diode

Chapter 6(b) Sinusoidal Steady State Analysis

Chapter 20 AC Network Theorems.

Load-Line Analysis of Complex Circuits with small signal diode model

Recall-Lecture 4 Current generated due to two main factors

Ch2 Basic Analysis Methods to Circuits

Diode Circuits.

DC OR STATIC RESISTANCE

Recall-Lecture 4 Current generated due to two main factors

Diode Circuits.

Diode Circuits.

Chapter 10 – AC Circuits Recall: Element Impedances and Admittances

Chapter 10 – AC Circuits Recall: Element Impedances and Admittances

Electronic PRINCIPLES

C H A P T E R 3 Resistive Network Analysis.

Analysis of Diode Circuits

Mechatronics Engineering

ECE 4991 Electrical and Electronic Circuits Chapter 3

Presentation transcript:

Cct. Models for semiconductor diodes Diode Models Large Signal Small Signal Piecewise Linear Ideal Diode Offset Diode

Offset Diode Model Internal resistance =0 Cutoff frequency (c)>0 (Vγ=0.6 volts for Silicon) Reverse current (Is) =0 Can be modeled as Ideal diode in series with Vγ

I-V characteristic curve Offset diode accounts for the offset voltage (better approximation). If VD < Vγ it will be OFF (open circuit in series with Vγ. If VD> Vγ it will be ON (short circuit series with Vγ).

Example 1 Given offset diode with Vg = 0.7V, Calculate ID. we assume it is ON and then check current direction if it is consistent. By inspection it is clear that current is consistent with our assumption

Example (cont.) Try solving assuming that diode is off. Note that offset diode voltage is not similar to the open cct. voltage.

Example 2 If VB = 2 V; R1 = 1 k; R2 = 0.5 K ; Vγ = 0.6 V. Determine Minimum value of V1 so D1 conducts. Sol: we assume diode OFF.

Cct. Models for semiconductor diodes Diode Models Large Signal Small Signal Piecewise Linear Ideal Diode Offset Diode

Large Signal Vs. Small signal Models In small signal model, the exact I-V char. Curve is used to determine diode voltage and current  it is used to determine accurate operating point of the diode. Large signal models use approximating I-V char. Curve and thus approximate results of diode voltage and current.

Small Signal Model No approximation is used. Diode cannot be replaced with linear element (open or short). We need to deal with the non-linear properties of the diode. KVL, KCL can be applied Nodal and Mesh analysis cannot be used. Superposition only deals with Linear circuit elements!!

The Operating point of the Diode The operating point (or Q-point) is the point that determines the exact value of diode voltage and diode current.

Load-Line Analysis of Diode Circuits

Example 1- Load-Line Analysis

Example 2 - Load-Line Analysis

Load-Line Analysis of Complex Circuits What if we have more than one source and one load ??  Use the Thevenin Equivalent

Example 3

Example 3 (cont.) (IDQ, VDQ) The Q point (Operation point) is the solution of the system. (IDQ, VDQ)

Example 4 Determine the operating point of the diode shown in the following circuit. The I-V char. Curve is given below.

Example 4 (cont.)

Cct. Models for semiconductor diodes Diode Models Large Signal Small Signal Piecewise Linear Ideal Diode Offset Diode

Piecewise linear Diode Model For this model we assume the following: Cutoff frequency >0 Internal resistance (rD) >0 (but constant!!) Reverse current =0. The approximation mainly in the value of the internal resistance.

Piecewise-Linear Diode Models Now, diode voltage is the sum of resistance voltage and cutoff frequency voltage.