Universitãt Stuttgart

Qimonda Ag

Universitaet Stuttgart

Institut Fur Mikroelektronik Stuttgart

Manfred Berroth

Peter Gregorius

Johannes C Reichart

Harald Giessen

Axel Rumberg

Heinz Clemens Schweizer

Heinz Schweizer

Markus Groezing

Jörg Butschke

Hedwig Graebeldinger

Liwei Fu

Lei Wu

Hedwig Gräbeldinger

The invention relates to a method and filter structure for filtering an input signal, which is applied to an input () of the filter structure, having a symbol rate. The input signal is guided to multiple parallel branches of the filter structure connected to the input (), in which at least two sequence holding members () are each disposed. Symbol values of the input signal, which are applied to the outputs of the sequence holding members () at certain points are guided to multiple (N) parallel signal addition units () having weighted inputs. One output signal each is generated in the signal addition units () as the sum of the weighted symbol values that are applied to the inputs. According to the invention, space and energy saving filter structure is provided, wherein: the same amount of sequence holding members () is disposed in each of the parallel branches; as many signal addition units () are disposed in the filter structure as the amount of parallel branches are provided in the filter structure; the sequence holding members () and addition units () are nested inside each other; and the sequence holding members die () and the signal addition units () are controlled via a multi-phase clock signal (Fto).

Filter structure and method for filtering an input signal

A metamaterial having a negative refractive index is presented, which has a dielectric carrier material (), first electrically conductive sections () and second electrically conductive sections (). The metamaterial is distinguished by the fact that the dielectric carrier material () is realized as a volume which consists of one piece and which has at least one inner area which is prestructured by positive or negative rib or mesa structures () in the dielectric carrier material () and is covered with first sections () and second sections () in such a way that the first sections form capacitive series impedances upon illumination with an electromagnetic wave having a specific propagation direction and polarization, while the second sections are arranged in such a way that they form inductive shunt impedances upon the illumination. An optical element, a preferred use of a metamaterial and also a method for producing a metamaterial are furthermore presented. The structuring of partial regions of the metamaterial can be effected with the aid of negative/positive mesa structures.

Metamaterial having the capability of broadband left-hand guidance of electromagnetic waves

A first data path is coupled between a data input and a data output of a circuit. A second data path is coupled between the data input and the data output. The first data path includes a parallelization circuit coupled to the data input to receive a serial data signal and configured to generate a parallelized data signal from the serial data signal, a first sampling circuit coupled to the parallelization circuit and configured to sample the parallelized data signal, and a serialization circuit coupled to the first sampling circuit and configured to serialize the sampled parallelized data signal. The second data path includes a second sampling circuit coupled to the data input and configured to sample the serial data signal. A selection circuit is configured to select between the first data path and the second data path.

Circuit with selectable data paths

An H.F. power amplifier is disclosed having a plurality of branches () switched in parallel. Each branch comprises a plurality of amplifier elements (T, T) switched in series. Resistors (R, R) enable the voltage (U_DS) applied to the amplifier elements (T, T) to be set at a fraction of a supply voltage (Ud) applied to the branches (). Capacitors (C, C) are used to adjust the source impedance of the amplifier elements (T, T). In order to prevent the gate-drain voltage (U_GD) from exceeding the breakdown voltage of an amplifier element (T, T) and damaging the amplifier element (T, T), a limiting path () is connected according to the invention between the gate terminal (G) and the drain terminal (D) of the amplifier element (T, T), the limiting path () being switchable between a conducting state and a blocking state depending on the gate-drain voltage (U_GD).

Power amplifier for amplifying high-frequency (H.F.) signals

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Sindelfingen, Germany

Manfred Berroth