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- INTRODUCTION
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- 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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