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1986-06-04
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INTRODUCTION
ALMOND (Algorithm for Microwave Optimal Network Design) is a
high frequency/microwave circuit design tool written for users of
IBM personal computers. Incorporating a wide range of distributed,
lumped, and defined elements, plus interconnections,ALMOND enables
the user to make design decisions based on the program's four main
functions: (1) Response analysis, (2) Stability analysis,
(3) Sensitivity analysis, and (4) Optimization (up to 6 variables
and 20 frequencies).
Active devices are described by their two-port scattering
parameters, while certain passive devices (ie-diodes) may be
described as measured impedances or reflection coefficients.
Both of these element types are stored by the user as data
files, which the program uses to generate interpolation data
(up to tenth order fit) during analysis. This allows the user
to establish his or her own library of applicable device data.
ALMOND contains three user-oriented editors for the
purpose of creating, modifying, and storing network topologies,
data files, and optimization objectives. There is no need for
any external support routines for the purpose of using ALMOND
to the limit of its abilities.
Both single and coupled (one case) transmission lines are
included, and are defined in terms of their electrical
parameters only, rather than their physical dimensions.
Available memory and execution time dictated this singular
approach, and is of little inconvenience to the designer, as
much design information in this area is readily available from
a number of outside sources.
Optimization is accomplished through the use of a modified
razor search algorithm. As execution time for this feature is
sometimes lengthy, provision has been made to list intermediate
results to the user's printer, allowing monitoring of the
progress of optimization at the users convenience. Sensitivity
analysis is included as an aid to the user in determining which
elements are most appropriate for optimization.
ALMOND offers, to the IBM PC user, a highly capable
design tool for high frequency and microwave circuits, with two
key advantages: simplicity and availability. The user-oriented
interactive displays, with full menus at all levels, enables
the typical circuit designer to learn to operate ALMOND within
a few hours. As for availability, the designer is now able to
accomplish his or her own design tasks whenever and wherever
access to an IBM personal computer is available, as well as
maintain a customized data library for devices commonly used in
the individual user's circuit designs.
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