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Wideband Amplifier Design

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  • Author:

  • Year: 2007

  • Format: Hardback

  • Product Code: SBCS0100

  • ISBN: 978-1-89112-151-7

  • Pagination: 391 pp.

  • Stock Status: Out of stock

    The estimated arrival date is June 2012
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In this book, the theory needed to understand wideband amplifier design using the simplest models possible will be developed. This theory will be used to develop algebraic equations that describe particular circuits used in high frequency design so that the reader develops a "gut level" understanding of the process and circuit. SPICE and Genesys simulations will be performed to show the accuracy of the algebraic models. By looking at differences between the algebraic equations and the simulations, new algebraic models will be developed that include parameters originally left out of the model. By including these new elements, the algebraic equations provide surprising accuracy while maintaining simplicity and understanding of the circuit.

While the emphasis is on wide bandwidth (DC to several GHz) amplifiers with good transient response, the techniques presented are also quite useful to people doing classic analog design. For example, the same things that cause certain one-transistor amplifiers to oscillate at 5 GHz can also explain the behavior of an op-amp loaded into a capacitor. The term "high frequency" is relative. As such, this book is of interest to anyone doing analog design. Both op-amp designers (Integrated Circuit) and op-amp users will find the material useful. Other applications include fast digitizers, analog to digital converters (A/D), and digital to analog converters (D/A), as well as the emerging area of Ultra Wideband (UWB) radio. Narrow bandwidth (classic Radio Frequency (RF) design) is either similar to or a subset of the techniques presented in this book. As such, classic RF designers will also find the contents of this book useful.

Key Features

Develops theory and pragmatic techniques based on simple models for designing amplifiers with bandwidths extending from DC to the multi-GHz frequencies while maintaining a good transient response (MFED).

Uses a combination of simulation programs, including SPICE and Genesys, to compare real circuit performance to simulated data.

Develops highly accurate, simplified models providing insight into the behavior of all kinds of analog circuits, including wideband amplifiers, RF amplifiers, and circuits used for audio frequencies.

Book contents

Chapter 1 Basic Network Theory

1.1 Introduction

1.2 RC Low-Pass Filter

1.3 Transient Analysis

1.4 Second-Order Systems—an RLC Low-Pass Filter

1.5 Cascaded Filters

1.6 Additional Peaking Techniques

1.7 Nonsymmetric T-Coils

1.8 Other Uses of T-Coils

1.9 Physical Implementation of a T-Coil

1.10 Peaking Technique Summary

1.11 Chapter Summary



Chapter 2 Transistor Models with Application to Follower Circuit

2.1 Overview

2.2 High-Frequency Models

2.3 High-Frequency Models

2.4 Applying the Models

2.5 Cauer Series Expansion

2.6 Conditions for Stability for an Emitter Follower with a Capacitive Load

2.7 A Little Too Simple; Add Back REB and CJC

2.8 An Example

2.9 Adding Resistance to the Base

2.10 Stopping Oscillations

2.11 Package Parasitics

2.11.1 Simulation Results

2.12 Emitter-Follower Output Impedance

2.13 FETs

2.14 Negative Elements

2.15 The Grounded Base Amplifier

2.16 Chapter Summary



Chapter 3 The Difference Amplifier

3.1 Difference Amplifier Basics

3.2 High-Frequency Gain of the Difference Amplifier

3.3 Series Peaking

3.4 Adding a PNP Level-Shifter

3.5 Full Differential Amplifier Driven Differentially

3.6 A Single-Ended Difference Amplifier

3.7 The ft Doubler

3.8 Noise Figure

3.9 A Capacitive Load

3.10 FET Differential Amplifier

3.11 Chapter Summary 234 References

Chapter 4 Low-Frequency Nonlinear Performance

4.1 Overview

4.2 Basic Models

4.3 gm Modulation

4.4 Nonlinearity in Difference Amplifiers

4.5 A Low-Distortion Difference Amplifier

4.6 Feed-Forward Correction in FET Amplifiers

4.7 Linearity Correction for ft Doublers

4.8 Summary of Linearity-Correction Circuits

4.9 Thermals [5]

4.10 Frequency-Dependent Dielectric Constants

4.11 Problems with Attenuators

4.12 Chapter Summary 306 References


Chapter 5 Shunt Feedback and Other Nifty Circuits

5.1 Overview

5.2 Composite Circuit

5.3 Shunt Feedback

5.4 High-Frequency Performance

5.5 Some Examples

5.6 Driving High Capacitance Loads

5.7 Op-Amps

5.8 NonLinear Effects in Op-Amps and Slew Rate

5.9 Chapter Summary


Book Summary

Appendix A: Gummel-Poon Models and ft

Appendix B: Two Port Parameters for the Simplified Models

B.1 h-Parameter Two-Port Model

B.2 s-Parameter Two-Port Network for the Simple Model

Appendix C: More on T-coils


About the author

Allen Hollister has over 30 years of experience in digital, analog, and RF engineering design and development.  He earned BSEE and MSEE degrees from the University of Nebraska and has 14 patents either granted or in the pending process.  He was a founder of the VXIbus consortium and served as its chairman.  He has also served on the IEEE 802.11 WiFi committee and has been an Assistant Professor of Engineering at Portland State University.  He is part owner and VP of Engineering at PSI Wireless, an RF consulting and wirelss technology company.

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