The design and characteristics of the Broad-Band Imager (BBI) of GREGOR are described. BBI covers the visible spectral range with two cameras simultaneously for a large field and with critical sampling at 390 nm, and it includes a mode for observing the pupil in a Foucault configuration. Samples of first-light observations are shown.

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Übersicht:Mit Hilfe von Transmissions-und Reflexionsmessungen können die Elemente der Ersatzschaltung einer in einem Gehäuse eingebauten Varaktordiode gefunden werden. Durch Messung des Richtstromes und der Sperrspannung der Diode ist es auch möglich, die C( U)-Kennlinie, die dynamische Güte (bei Stromsteuerung) und den Sperrschichtstrom der Diode zu bestimmen. Die Konstruktion der dafür notwendigen Mikrowellenkomponenten (kontinuierlicher Hohlleiterübergang, Diodenhalter, koaxiales Sperrfilter) wird beschrieben.Abstract: The elements in the equivalent circuit of a packaged varactor can be determined by transmission and reflection measurements. By measuring the diode current and the back bias it's also possible to determine the C( {/^characteristic, the dynamic quality (for current control) and the junction current of the diode. The construction of the required microwave components (waveguide taper, diode mounting support, choke) is described.Für die Dokumentation: Varaktormessung / Stromsteuerung / R-Band-Komponente

Zusammenfassung. In modernen CMOS-In modern CMOS-technologies the gate delay, output transition time and the short-circuit current depend on the capacitive load as well as on the input transition time. Today's technology libraries use table models with 25 or more samples for these dependencies. Intermediate values have to be calculated through interpolation. Attempts to derive analytical models are based on neglecting the short-circuit current or approximating it by piecewise linear functions. The approach shown in this paper provides an approximate solution for the differential equation describing the dynamic behavor of an inverter circuit. It includes the influence of both transistor currents and a single load capacitance. The required values for timing and power analysis can be calculated with a small set of technology parameters for an arbitrary designed inverter. Compared to reference values extracted fromCorrespondence to: R. Geißler (richard.geissler@e-technik.uni-ulm.de) SPICE simulations, the model achieves a typical precision of 5%.