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Structures for interconnecting active microwave semiconductor-devices, e.g. FET's and MIC's, with the electrical surrounding or with each other have to be designed more and more carefully when increasing the desired upper frequency limit. Therefore, several connecting structures for device embedding have been examined. Mainly, their applicability for the frequency range from 10 GHz to 100 GHz was considered. Additionally, different equivalent circuits were developed to approximately describe their behaviour for CAD-applications.
Die Wichtigkeit des Faches FEM ist sicher unumstritten. Um in der gegebenen Zeit eine ausreichende Einarbeitung in die Methode und die Uebung am Rechner durchfuehren zu koennen, ist der Einsatz eines auf PC lauffaehigen FE-Lernprogramms eine gute Hilfe. Sind die Grundlagen da, weiss der Student, welche Eingaben bei einem FE-Programm zu machen sind. Fuer manche Fachgebiete genuegt schon die Arbeit mit einem solchen Programm. Sind entsprechende Uebungen mit dem Lernprogramm erfolgt, kann auf professionellen Programmen wie z.B. CAEDS das Zusammenspiel CAD/FEM ernsthaft betrieben werden. Es sollte ein Fachsemester ausgesucht werden, in dem CAD und FE angeboten wird. Dieses Fachsemester sollte, um den Nutzen der FEM in moeglichst vielen Fachgebieten zu haben, zum Ende des Grundstudiums, spaetestens aber zu Beginn des Hauptstudiums liegen.
The advantages of the coupling-of-modes (COM) formalism and the transmission-matrix approach are combined to create exact and computationally efficient analysis and synthesis CAD tools for the design of SAW-resonator filters. The models for the filter components, especially gratings, interdigital transducers (IDTs). and multistrip couplers (MSCs), are based on the COM approach, which delivers closed-form expressions. In order to determine the relevant COM parameters, the integrated COM differential equations are compared with analytically derived expressions from the transmission-matrix approach. The most important second-order effects such as energy storage, propagation loss and mechanical and electrical loading are fully taken into account. As an example, the authors investigate a two-pole, acoustically coupled resonator filter at 914.5 MHz on AT quartz. Excellent agreement between theory and measurement is found.
Im Rahmen eines GPS-Projektes ist an der Fachhochschule Offenburg ein Konzept für einen experimentellen Navigationsempfänger entstanden. Hierfür wurde der digitale Teil entwickelt und aufgebaut. Für die Realisierung der Schaltung sollten benutzerprogrammierbare Gate Arrays von Xilinx (LCAs) verwendet werden, die sich schon bei einer anderen Arbeit an der Fachhochschule bewährt hatten.
Nachfolgend möchte ich dem Leser einen Überblick über das GPS-System und die Entwicklung der LCAs geben.
Die Elektronikindustrie bietet für die Realisierung digitaler Logik eine Vielzahl integrierter Bausteine an, die ein Höchstmaß an Zuverlässigkeit als auch Integrationsdichte ermöglichen.
Je nach Integrationsdichte unterscheidet man hierbei zwischen Standardlogik (TTL,CMOS,DTL...), programmierbarer Logik (PLA, GAL...), Gate Arrays und ASIC-Bausteinen. Mit steigender Integrationsdichte werden Systemeigenschaften verbessert, wie Leistungsverbrauch, Platzbedarf, und Zuverlässigkeit.
Jedoch steht ihr auch ein stark erhöhter Kosten- und Entwicklungsaufwand gegenüber, der den Einsatz hochintegrierter Bausteine in Einzelfertigung bzw. Kleinserien verhindert.
Xilinx bietet nun mit seiner LCA-Produktreihe (logic cell array) eine Alternative zu bestehender hochintegrierbarer Logik an, mit der es möglich sein soll, Vorteile der genannten Einzelproduktgruppen zu übernehmen, und deren Nachteile zu beseitigen.
Im Rahmen einer Diplomarbeit wurde ein solcher LCA-Baustein (XC3020) eingesetzt. Anhand der gegebenen konkreten Anwendung konnte hierbei untersuch twerden, wie schnell sich ein solcher Baustein in bestehende Hardware eingliedern läßt, und welche Integrationsdichte er ermöglicht.
Im Folgenden sollen nun als Schwerpunkte das Einsatzgebiet, die Entwicklung und die Simulation des LCA bei vorliegender Aufgabenstellung aufgezeigt werden.
An der FH Offenburg arbeiten seit Ende 1989 in einem Team die Professoren Dr. Jansen, Dr. Schüssele, die wissenschaftlichen Mitarbeiter Bernd Reinke, Martin Jörger und die Diplomanden Hans Fiesel, Otmar Feißt an dem Entwurf eines Nachrichtenempfängers. Im Rahmen dieses Projekts, genannt GPS-Projekt (GPS = Global Positioning System), wurde im Herbst 1990 ein experimenteller Empfänger in Betrieb genommen. Nachdem die Testergebnisse gezeigt hatten,daß das Konzept der Anlage stimmte, ging es nun um die Miniaturisieriung, Integration und Optimierung der Schaltung. Außerdem sollte der bisher verwendete PC durch einen auf der Platine befindlichen Mikroprozessor ersetzt werden. Im Zusammenhang mit dem GPS-Projekt wurden bisher im Offenburger ASIC-Labor eine Analogschaltung auf einem B500, drei LCA Designs und diverse GAL's entwickelt.
Zur Zeit arbeiten mehrere Diplomanden an der zweiten Generation des Empfängers. Meine Aufgabe besteht darin, die dort noch in drei LCA's untergebrachte digitale Logik sowie einen Teil des bisherigen PC-Interface in einem IMS Gate Forrest zu integrieren. Außerdem muß die Logik von 8 Bit auf einen 16 Bit breiten Datenbus umgestellt und an die neue Peripherie des Mikroprozessors angepasst werden. Damit soll die jetzige Digital-Platine noch weiter verkleinert werden. Wesentlich ist dabei die Umsetzung der zahlreichen Zähler- und Registerstrukturen in einem Gate Forrest. Als Arbeitsmittel stehen Apollo Workstations mit Mentor Software zur Verfügung.
Seit einiger Zeit wird an der Fachhochschule in Offenburg ein Entwicklungsprojekt verfolgt, an dessen Ende ein GPS Empfänger stehen soll. Dabei handelt es sich um einen Satellitenempfänger, mit dem weltweit eine genaue dreidimensionale Standortbestimmung durchgeführt werden kann. Für diesen Empfänger sollte ein Großteil der Analogschaltung, bestehend aus ZF Verstärker, Costas Loop Synchrondemodulator und Pegeldetektor, in das Transistorarray B500a von AEG intgriert werden. Das Chipdesign wurde im Labor für ASIC Design an der FH Offenburg während des Wintersemesters 1990/91 erstellt. Gefertigt wurde der Chip von der Firma AEG in Ulm, wobei die Fertigungszeit des ASIC 6 Wochen betragen hat.
Die Fachhochschule Offenburg bietet seit dem Wintersemester 1990/91 den Studenten des Fachbereichs Nachrichtentechnik das Wahlpflichtfach ASIC-Design an. Schon kurz nach der Errichtung des ASIC-Design-Centers im Frühjahr 1990 ermöglicht sie damit künftigen Ingenieuren eine Ausbildung in einem Bereich, der in der modernen Schaltungsentwicklung nicht mehr wegzudenken ist.