chapter 4 - vdc boylestad
TRANSCRIPT
-
7/29/2019 Chapter 4 - VDC Boylestad
1/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
Chapter 4: DC BiasingBJTs
Voltage-Divider Bias Configuration
-
7/29/2019 Chapter 4 - VDC Boylestad
2/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
DC Biasing Circuits
Fixed-bias circuit
Emitter-stabilized bias circuit
Voltage divider bias circuit
DC bias with voltage feedback
-
7/29/2019 Chapter 4 - VDC Boylestad
3/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
Voltage Divider Bias
-
7/29/2019 Chapter 4 - VDC Boylestad
4/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
Exact Analysis
Approximate Analysis
Methods of Analysis
-
7/29/2019 Chapter 4 - VDC Boylestad
5/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
Exact Analysis
-
7/29/2019 Chapter 4 - VDC Boylestad
6/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
Exact Analysis
To get the RTH:
To get the VTH:
-
7/29/2019 Chapter 4 - VDC Boylestad
7/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
Approximate Analysis
1I
2I
BI
BV
2iR R
1 2( )I I
( 1)i E
R R
-
7/29/2019 Chapter 4 - VDC Boylestad
8/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
Approximate Analysis
Where RE > 10R2:
From Kirchhoffs voltage law:
Where IB
-
7/29/2019 Chapter 4 - VDC Boylestad
9/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
Voltage Divider Bias Analysis
Load Line Analysis
Cutoff: Saturation:
Transistor Saturation Level
-
7/29/2019 Chapter 4 - VDC Boylestad
10/10
Copyright 2009 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458 All rights reserved.
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
Problem