Abstract: A deployable panel structure for an array antenna comprising a first and a second set of panels hinged together for deployment between a folded configuration for stowage and an elongate unfolded configuration; wherein the panels of said first set are hinged together about a plurality of spaced-apart axes which are transverse to an elongate axis of the unfolded structure and the panels of said second set are hinged to panels of the first set about lengthwise axes parallel to said elongate axis of the unfolded structure; and wherein the number and arrangement of the panels is such that a width of the unfolded structure, measured transversely of its elongate extent, is less at one or both of its ends than the width of its middle portion

Abstract: Apparatus, systems and techniques for implementing a servo controlled magnetic levitation system that magnetically levitates and controls a magnetic platform to navigate in a confined space to obtain capture images of or other information of the confined space. Medical surgical or diagnostic systems and various detection systems may be constructed based on the described systems.

Abstract: A method for measuring a surface profile using a surface sensing device mounted on an articulating probe head in which the probe head is moved along a nominal path relative to the surface profile, an at least approximation of the surface normal of the surface profile, the surface profile is sensed with the surface sensing device and the distance or force of the surface sensing device relative to the surface profile substantially in the direction of the surface normal. The surface normal may be determined by approximating at least one section to a curved profile which can be mathematically parameterised.

Abstract: A system is disclosed for operating a plurality of receiver paths and/or a plurality of transmitter paths in a single mode or multiple mode configuration.

Abstract: A transmission arrangement is disclosed in which two different signal paths are provided for two operating modes, in order to couple a baseband signal processing unit to a radio-frequency mixer for transmission of the modulation signal. In a first operating mode, the frequency mixer operates as a step-up frequency mixer, and converts a baseband modulation signal to radio frequency. In a second operating mode, a frequency generator is supplied with a signal that is dependent on the modulation signal and is just amplified in the frequency mixer. The described transmission arrangement supports both the conventional GSM standard and the extended GSM EDGE with higher transmission rates. The transmission arrangement in this case has good noise characteristics with a low power consumption.

Abstract: A stereoscopic display device comprises a display device for displaying a pixellated display image; and a stereoscopic conversion screen. The conversion screen comprises an array of light guiding members, each light guiding member being associated with an underlying pixel or sub-array of pixels, and wherein alternate rows of light guiding members are arranged to direct light from the associated pixel or sub-array of pixels to different viewing positions. The invention provides spatial multiplexing of images into successive horizontal rows, rather than in vertical columns, as in common practice. This can resolve a looming problem so that a stereoscopic effect is perceived across the full width of the 2D image. This spatial multiplexing screen may be combined with a dynamic temporal multiplexing arrangement to increase the number of views. The invention also relates to such a dynamic temporal multiplexing system.

Abstract: The invention specifies a transmission arrangement, particularly for mobile radio, which has a homodyne design and in which a feedback path is routed from the input or from the output of the vector modulator (10, 11, 12, 14) via a switch (20) and an A/D converter (19) back to the digital signal processing (3) in baseband (1). As a result, it is a particularly simple matter to detect offsets and amplitude mismatches and to correct them without difficulty in a digital signal processor (3). This allows both significantly improved carrier frequency suppression and significantly improved sideband suppression to be achieved with little complexity. The mobile radio transmitter described is particularly suitable for use in modern mobile radio systems such as GSM EDGE and UMTS.

Abstract: A transmitting arrangement, in particular for mobile radio, has a quadrature modulator with an upstream, digital signal processing unit. In order to suppress side bands and the carrier frequency, which may occur as a result of excessive matching tolerances between the components which are used, a feedback path couples the modulator output to the digital signal processing unit. The feedback path provides the envelope of the transmission signal at the input of the digital signal processing unit in order to provide preemphasis in the digital signal processing. The envelope can be provided by an undersampling A/D converter in the feedback path.

Abstract: A current converter has a first amplification device, which outputs a differential current depending on a differential control signal and derives a differential feedback signal from the differential current. The current converter also has a second amplification device, which amplifies a differential input signal at its input depending on the differential feedback signal to form the differential control signal. The current converter may be used in a frequency mixer together with a mixer cell which produces a differential output signal by multiplying the differential current and an oscillator signal.

Abstract: In a transmission arrangement with power regulation, feedback from an output of a modulator to a digital signal processor is effected via a transmission power detector and an analog/digital converter. The digital signal processor processes baseband signals to be transmitted, and is coupled to the modulator in a transmission path. It is therefore possible to influence the baseband signal amplitudes and/or to program the gain of mixers in the modulator, based on the detected transmission power.

Abstract: The present invention relates to a radio-frequency mixer arrangement in which a differential amplifier is connected to an input on a multiplier. The differential amplifier is arranged together with at least one capacitance in the feedback path of an operational amplifier. The at least one capacitance performs the function of an antialiasing filter. The feedback operational amplifier with the design described results in a highly linear output signal given low output noise and a low current requirement. The mixer proposed is particularly suitable for use in vector modulators or polar modulators in transmission paths in mobile radios.

Abstract: A controllable amplifier amplifies a radiofrequency input signal on the basis of a control signal. A current path is formed between a supply potential connection and a reference potential connection. The current path includes an amplifier transistor and a cascode transistor, the cascode transistor being connected to the input for supplying the control signal. The output power of the amplifier is controlled using the cascode transistor, as a result of which a low power consumption is achieved in conjunction with good noise properties.

Abstract: The invention specifies a transmission arrangement, particularly for mobile radio, which has a homodyne design and in which a feedback path is routed from the input or from the output of the vector modulator (10, 11, 12, 14) via a switch (20) and an A/D converter (19) back to the digital signal processing (3) in baseband (1). As a result, it is a particularly simple matter to detect offsets and amplitude mismatches and to correct them without difficulty in a digital signal processor (3). This allows both significantly improved carrier frequency suppression and significantly improved sideband suppression to be achieved with little complexity. The mobile radio transmitter described is particularly suitable for use in modern mobile radio systems such as GSM EDGE and UMTS.

Abstract: The present invention relates to a radio-frequency mixer arrangement in which a differential amplifier is connected to an input on a multiplier. The differential amplifier is arranged together with at least one capacitance in the feedback path of an operational amplifier. The at least one capacitance performs the function of an antialiasing filter. The feedback operational amplifier with the design described results in a highly linear output signal given low output noise and a low current requirement. The mixer proposed is particularly suitable for use in vector modulators or polar modulators in transmission paths in mobile radios.

Abstract: A transmission arrangement is disclosed in which two different signal paths are provided for two operating modes, in order to couple a baseband signal processing unit to a radio-frequency mixer for transmission of the modulation signal. In a first operating mode, the frequency mixer operates as a step-up frequency mixer, and converts a baseband modulation signal to radio frequency. In a second operating mode, a frequency generator is supplied with a signal that is dependent on the modulation signal and is just amplified in the frequency mixer. The described transmission arrangement supports both the conventional GSM standard and the extended GSM EDGE with higher transmission rates. The transmission arrangement in this case has good noise characteristics with a low power consumption.

Abstract: A polar loop transmission circuit is proposed wherein a signal to be transmitted and a feedback signal are separated into their polar phase and amplitude components and the components are compared to one another for realizing a phase and amplitude modulation. An amplitude modulator controlled by an amplitude modulation signal is provided, whereby the amplitude modulator follows an oscillator and is preferably fashioned as a nonlinear amplifier that is operated in saturation. An amplifier attenuating the output signal of the amplitude modulator is provided in the feedback path. The present transmission architecture is suitable for future mobile radio telephone systems having a phase and amplitude modulation and are based on the known GSM standard, for example.

Abstract: In a transmission arrangement with power regulation, feedback from an output of a modulator to a digital signal processor is effected via a transmission power detector and an analog/digital converter. The digital signal processor processes baseband signals to be transmitted, and is coupled to the modulator in a transmission path. It is therefore possible to influence the baseband signal amplitudes and/or to program the gain of mixers in the modulator, based on the detected transmission power.

Abstract: A transmitting arrangement, in particular for mobile radio, has a quadrature modulator with an upstream, digital signal processing unit. In order to suppress side bands and the carrier frequency, which may occur as a result of excessive matching tolerances between the components which are used, a feedback path couples the modulator output to the digital signal processing unit. The feedback path provides the envelope of the transmission signal at the input of the digital signal processing unit in order to provide preemphasis in the digital signal processing. The envelope can be provided by an undersampling A/D converter in the feedback path.

Abstract: A multiplier circuit is specified, for the multiplication of two input signals, in which two transistor pairs (2, 3; 4, 5) couple a first input (1, 2) to an output (9, 10) of the multiplier, load terminals of the transistor pairs (2, 3; 4, 5) being connected to a second input (15, 16) of the multiplier via a current mirror (11, 12). The differential amplifier usually provided in Gilbert multipliers is thereby obviated, with the result that it is possible to achieve improved noise properties of a transmitter arrangement with vector modulator in which the multipliers can preferably be used.