Manual Trade-Offs in Analog Circuit Design: The Designer’s Companion

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  3. Trade-Offs in Analog Circuit Design
  4. ISBN 10: 1402070373
  5. Chris Toumazou (Author of Analogue IC Design)

George Moschytz. David Haigh.

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Etc Toumazou. Nicholas Battersby. Chris Tournazou. Toumaz ou , Chri s Toumaz ou , F.

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Lidgey , David Haigh , Etc. Toumaz ou , C. Tomazou , D. This activity is linked to important advances in integrated circuit technologies, such as the "true" complementary bipolar process; CMOS VLSI technology, which allows realization of high-performance mixed analogue and digita This is a trend that is bound to continue for the foreseeable future and while it does, understanding performance trade-offs will constitute a vital part of the analog design process.

It is the insight and intuition obtained from a f It is compiled from course material used in a suite of one-day tutorials on circuits and systems designed expressly for engineers and research scientists who want to explore subjects outside, but related to, their immediate fields. Lidgey , C.

Trade-Offs in Analog Circuit Design

Toumaz ou , D. Lidgey , D. Boards may be:.

Analog Circuit Design using Genetic Algorithms

However, some capacitors and power rectifier diodes may require larger holes. Convection and conduction are controllable methods for removing heat from system components.

ISBN 10: 1402070373

This is necessary because component-generated heat can radiate to other components and affect reliability. In Chapter 3 , Passive Components, the book describes resistors, capacitors, and inductors. Resistors may be taken for granted, as long they are operated within their power, voltage, and environmental ratings. However, there are applications where specifying and applying resistors needs to be handled with some care. Fixed-value resistors can be classified according to their construction:.

In addition, there are variable resistors such as potentiometers, rheostats, and trimmers. Plus, there are resistor networks with multiple resistors.

There are also classes of resistors for high-precision, high-voltage, and low-voltage applications. There are also chip inductors that are manufactured using semiconductor material.

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This chapter concentrates on discrete semiconductor components that are widely used in electronics design. It is as well to be familiar with the characteristics of practical components as even when integrated they show the same fundamental properties. Added to this edition of this book is a section on gallium nitride GaN and silicon carbide SiC wide bandgap devices that exhibit significant performance improvements over silicon devices.

Professor Wilson says that despite the intrinsically higher wafer costs, he expects the prices will continue to drop as more products enter the market, and a wider range of manufacturers develop competitive devices. An interesting challenge for designers wishing to use SiC or GaN devices in the future will be to develop effective gate drive circuits that will be designed to manage the much higher switching frequencies that are possible with both SiC and certainly with GaN devices.

Chapter 5 , Analog Integrated Circuits, describes the operational amplifier as the basic building block for analog circuits and also devotes space to comparators and voltage references Fig. A discussion of op amp parameters includes:. The author looks at the departures from the ideal op-amp parameters that are found in practical devices and surveys the trade-offs including cost and availability, as well as technical factors that have to be made in real designs.

Some instances of anomalous behavior are examined.

The author points out that there is an obvious trade-off between initial voltage tolerance and temperature coefficient on the one hand, and cost and availability on the other, since the manufacturer has to accept a lower yield and longer test and trim time for the closer tolerances. Initial voltage can be trimmed exactly with a potentiometer, but this method adds both parts and production cost, which will offset the higher cost of a tighter tolerance part. Trimming the reference voltage can also worsen the reference temperature coefficient in some configurations. Chapter 6 , Digital Circuits, covers devices from logic ICs to microprocessors.

Digital techniques eliminate the unpredictability and variability of analog, or linear circuits, including voltage drifts, component tolerances, offsets, and impedance inaccuracies that are irrelevant in digital circuits. Also, digital circuits enable programmability so that a single piece of hardware can perform different tasks.

Chris Toumazou (Author of Analogue IC Design)

This is virtually impossible to do with analog hardware. Interfaces between logic ICs and associated clock and power supply lines must be considered to achieve a reliable digital design. The author admits that the subject of microprocessors and microcontrollers is vast, so this book is not going to cover it all. However, he looks at some of the issues that arise when using these devices to fulfill functions that historically were the domain of the analog circuit. Chapter 7 , Power Supplies, includes linear and switch-mode types, as shown in Fig.

Join the resistance.

The transformer in a switch-mode supply performs the same function as in a linear supply but now operates with a high-frequency square wave instead of a low-frequency sine wave. The smaller transformer allows a physically smaller power supply. The author advocates that you should not design a power supply yourself if you can buy it off-the-shelf. However, there are times when there is not enough space or you need special design requirements. Advantages of using a standard off-the-shelf unit are that it saves a considerable amount of design and testing time, the resources for which may not be available in a small company with short timescales.

With the increasing availability of very compact microprocessors and high-quality power devices, there has been the development of solid-state protection circuits ranging from simple fuses to advanced configurable protection devices.