chapter 4 - vdc boylestad

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    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

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    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

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    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

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    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

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    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

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    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:

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    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

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    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

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    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

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    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