Analog design is one of the more difficult aspects of electrical
engineering. The main reason is the apparently vague decisions an
experienced designer makes in optimizing his circuit. To enable
fresh designers, like students electrical engineering, to become
acquainted with analog circuit design, structuring the analog
design process is of utmost importance. Structured Electronic
Design: Negative-Feedback Amplifiers presents a design methodology
for negative-feedback amplifiers. The design methodology enables to
synthesize a topology and to, at the same time, optimize the
performance of that topology. Key issues in the design methodology
are orthogonalization, hierarchy and simple models.
Orthogonalization enables the separate optimization of the three
fundamental quality aspects: noise, distortion and bandwidth.
Hierarchy ensures that the right decisions are made at the correct
level of abstraction. The use of simple models, results in simple
calculations yielding maximum-performance indicators that can be
used to reject wrong circuits relatively fast. The presented design
methodology divides the design of negative-feedback amplifiers in
six independent steps. In the first two steps, the feedback network
is designed. During those design steps, the active part is assumed
to be a nullor, i.e. the performance with respect to noise,
distortion and bandwidth is still ideal. In the subsequent four
steps, an implementation for the active part is synthesized. During
those four steps the topology of the active part is synthesized
such that optimum performance is obtained. Firstly, the input stage
is designed with respect to noise performance. Secondly, the output
stage is designed with respect to clipping distortion. Thirdly, the
bandwidth performance is designed, which may require the addition
of an additional amplifying stage. Finally, the biasing circuitry
for biasing the amplifying stages is designed. By dividing the
design in independent design steps, the total global optimization
is reduced to several local optimizations. By the specific sequence
of the design steps, it is assured that the local optimizations
yield a circuit that is close to the global optimum. On top of
that, because of the separate dedicated optimizations, the resource
use, like power, is tracked clearly. Structured Electronic Design:
Negative-Feedback Amplifiers presents in two chapters the
background and an overview of the design methodology. Whereafter,
in six chapters the separate design steps are treated with great
detail. Each chapter comprises several exercises. An additional
chapter is dedicated to how to design current sources and voltage
source, which are required for the biasing. The final chapter in
the book is dedicated to a thoroughly described design example,
showing clearly the benefits of the design methodology. In short,
this book is valuable for M.Sc.-curriculum Electrical Engineering
students, and of course, for researchers and designers who want to
structure their knowledge about analog design further.
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