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It bridges the gap between the theoretical learning that most university courses provide and the practical knowledge and application that comes from years of experience. Topics covered include analog and digital circuits, component types, power supplies and printed circuit board design, plus new coverage of the latest advances in electronics since the previous edition published.

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The Circuit Designer's Companion is ideal for Professional electronics design engineers, advanced amateur electronics designers, electronic engineering students and professors looking for a book with a real-world design outlook. Beaverton, Oregon. He is also a consultant for Integra Design Ltd in various aspects of embedded systems including design and modeling. The Circuit Designer's Companion. 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.

Designing Robust Circuits - EMC part 1 (Example of bad design + quick fix)

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.

The Circuit Designer's Companion

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.

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. 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.

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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.

These solid-state devices can be considered under the generic term SSPC solid-state protection circuit. Chapter 8 , Electromagnetic Compatibility, is a design consideration because all electrical and electronic devices generate electromagnetic interference EMI and are also susceptible to it. The designer must reduce this generation and susceptibility to acceptable levels. With the increasing penetration of solid-state electronics into all areas of activity, acceptable levels of interference have become progressively tighter as physical separation between devices has reduced and reliance on their operation has increased.


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The author notes that a common response of circuit designers when they discover EMC problems late in the day is to specify some extra shielding and filtering in the hope that this will provide a cure. However, this brute-force approach may not be necessary if you put in some extra thought at the early circuit-design stage.

Shielding and filtering costs money, circuit design does not. Most design for EMC is just good circuit-design practice anyway.

The Circuit Designer's Companion

Printed circuit layout also has a significant impact. Short, direct tracks running close to their ground returns make very inefficient aerials and are therefore good for controlling both emissions and susceptibility. Chapter 9 , General Product Design, describes how electronic equipment must be designed for safe and reliable operation. There are various safety requirements for different product sectors. In some cases, compliance with these standards is mandatory. Most safety specifications require inaccessibility to the equipment.

Any openings in the equipment case must be small enough that the standard test finger cannot contact a live part.