Computer-aided optimization of broadband nonlinear microwave integrated circuits with the aid of electromagnetically generated look-up tables
✍ Scribed by Vittorio Rizzoli; Alessandra Costanzo; Claudio Cecchetti; Diego Masotti
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 250 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
The direct numerical optimization of nonlinear microwa¨e circuits by harmonic-balance analysis coupled to electromagnetic simulation is a formidable computational task, e¨en if ad¨anced algorithmic concepts such as the space-mapping technique are exploited. In order to obtain a reasonable compromise between accuracy and design time, the most CPU-time-intensi¨e components may be extracted from the circuit and separately analyzed by electromagnetic techniques. The results are then organized in the form of look-up tables that are coupled to the optimization process by means of suitable interpolation algorithms. The article discusses the generation of such a family of look-up tables for square spiral inductors, and their use in nonlinear circuit optimization. It is shown that the range of inductance ¨alues typically of interest for RF r microwa¨e design can be co¨ered by two-dimensional tables depending on frequency and on one geometrical parameter only. The resulting optimization process is fast and well beha¨ed, and can normally achie¨e the same circuit performance produced by a design approach based on ideal lumped inductors.