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 isdesigned 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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