Abstract: There is provided a toy, including a ball chasing robot including: a controller configured to receive power from a battery a plurality of infrared sensors configured to detect infrared radiation emitted by a satellite object, the plurality of infrared sensors connected to the controller; a motor configured to drive a wheel arrangement, the wheel arrangement including at least two drive wheels, wherein: the controller is configured to control the motor and wheel arrangement to drive the ball chasing robot towards the infrared radiation emitted by the satellite object detected by the plurality of infrared sensors; wherein the ball chasing robot includes a plurality of settings, including: a play setting, wherein the controller is configured to control the motor, such that the ball chasing robot is driven towards the source of the infrared radiation emitted by the satellite object, and a sleep setting wherein the controller is configured to turn off the plurality of sensors, wherein the sleep setting is entered

Abstract: There is provided a toy, including a ball chasing robot including: a controller configured to receive power from a battery a plurality of infrared sensors configured to detect infrared radiation emitted by a satellite object, the plurality of infrared sensors connected to the controller; a motor configured to drive a wheel arrangement, the wheel arrangement including at least two drive wheels, wherein: the controller is configured to control the motor and wheel arrangement to drive the ball chasing robot towards the infrared radiation emitted by the satellite object detected by the plurality of infrared sensors; wherein the ball chasing robot includes a plurality of settings, including: a play setting, wherein the controller is configured to control the motor, such that the ball chasing robot is driven towards the source of the infrared radiation emitted by the satellite object, and a sleep setting wherein the controller is configured to turn off the plurality of sensors, wherein the sleep setting is entered

Abstract: A device for converting a digital input signal into an analog output signal is provided. The device includes a first digital to analog converter configured to generate a first analog signal, and a second digital to analog converter configured to generate a second analog signal. The device further includes a signal splitter configured to couple out a feedback signal from the second analog signal. The device further includes a first signal combiner configured to subtract the feedback signal from the first analog signal to generate an error signal. The device further includes an amplifier configured to amplify the error signal, resulting in an amplified error signal. The device further includes a second signal combiner configured to combine the amplified error signal and a signal derived from the second analog signal, resulting in the analog output signal.

Abstract: A measuring system for determining phase differences of antenna element signals of antenna elements of an antenna array under test is provided. The measuring system comprises a signal generating means, which is configured to provide a measuring signal to the antenna array under test over the air and receiving means configured to measure the antenna element signals, resulting from receiving the measuring signal by the antenna elements of the antenna array under test and determine the phase difference of the antenna element signals.

Abstract: A measuring system for determining a beamforming quality of an antenna array signal of an antenna array of a device under test. The measuring system comprises a measuring device configured to receive an antenna array signal, and to measure the antenna array signal and to determine a beamforming signal quality thereof. The antenna array signal is wirelessly transmitted to the receiver by the antenna array of a device under test. The measuring system further comprises a positioning unit configured to position the device under test in successive predefined orientations. The measuring device is configured to receive and measure the antenna array signal successively in each of the predefined orientations.

Abstract: A test system for testing an array antenna under test with at least two antenna elements comprises a signal generator that generates a test signal, a signal splitter that splits the test signal into a plurality of antenna source signals for the single antenna elements, and a vector multiplier for each one of the antenna source signals, wherein the vector multipliers each adjust the amplitude and/or phase of the respective antenna source signal according to predetermined adjustment parameters and wherein output ports of the vector multipliers are connected to respective ones of the antenna elements.

Abstract: A system for measuring or characterizing a multi-element antenna having at least two antenna elements comprises a vector network analyzer with at least two input/output ports. Each input/output port of the vector network analyzer is connected to one antenna element of the multi-element antenna. The vector network analyzer has generator means for generating waves at each of its input/output ports, which are coherent to each other.

Abstract: A test system for testing an array antenna under test with at least two antenna elements comprises a signal generator that generates a test signal, a signal splitter that splits the test signal into a plurality of antenna source signals for the single antenna elements, and a vector multiplier for each one of the antenna source signals, wherein the vector multipliers each adjust the amplitude and/or phase of the respective antenna source signal according to predetermined adjustment parameters and wherein output ports of the vector multipliers are connected to respective ones of the antenna elements.

Abstract: A device for converting a digital input signal into an analog output signal is provided. The device includes a first digital to analog converter configured to generate a first analog signal, and a second digital to analog converter configured to generate a second analog signal. The device further includes a signal splitter configured to couple out a feedback signal from the second analog signal. The device further includes a first signal combiner configured to subtract the feedback signal from the first analog signal to generate an error signal. The device further includes an amplifier configured to amplify the error signal, resulting in an amplified error signal. The device further includes a second signal combiner configured to combine the amplified error signal and a signal derived from the second analog signal, resulting in the analog output signal.

Abstract: A design method for designing a multi-path amplifier involves connecting an amplifier stage having at least two amplifier branches to a combiner stage; feeding a plurality of testing signals with one or more of a plurality of sweeping variables to the amplifier stage; measuring output signals at the output of the combiner stage depending on the plurality of testing signals; designing a structure of an input network stage for the amplifier stage on the basis of the measured output signals; and combining the designed input network stage with the amplifier stage to create an efficiency-optimized multi-path amplifier.

Abstract: A measuring system for determining phase differences of antenna element signals of antenna elements of an antenna array under test is provided. The measuring system comprises a signal generating means, which is configured to provide a measuring signal to the antenna array under test over the air and receiving means configured to measure the antenna element signals, resulting from receiving the measuring signal by the antenna elements of the antenna array under test and determine the phase difference of the antenna element signals.

Abstract: A design method for designing a multi-path amplifier involves connecting an amplifier stage having at least two amplifier branches to a combiner stage; feeding a plurality of testing signals with one or more of a plurality of sweeping variables to the amplifier stage; measuring output signals at the output of the combiner stage depending on the plurality of testing signals; designing a structure of an input network stage for the amplifier stage on the basis of the measured output signals; and combining the designed input network stage with the amplifier stage to create an efficiency-optimised multi-path amplifier.

Abstract: The invention provides a method and a system for calibrating an input circuit of a device under test, the device including an amplifying circuit and a combining circuit. The method comprises the steps of: supplying at least one test signal (to the amplifying circuit; varying at least one test signal characteristic of the test signal supplied to the amplifying circuit; detecting, based on an output signal output by the combining circuit, at least one device characteristic of the device as a function of the varied test signal characteristic; determining at least one optimizing value of the test signal characteristic that optimizes at least one of the detected device characteristics according to at least one preset optimization criterion; and calibrating the input circuit based on the determined optimizing value of the test signal characteristic.

Abstract: A system for measuring or characterizing a multi-element antenna having at least two antenna elements comprises a vector network analyzer with at least two input/output ports. Each input/output port of the vector network analyzer is connected to one antenna element of the multi-element antenna. The vector network analyzer has generator means for generating waves at each of its input/output ports, which are coherent to each other.

Abstract: A measuring system for determining a beamforming quality of an antenna array signal of an antenna array of a device under test. The measuring system comprises a measuring device configured to receive an antenna array signal, and to measure the antenna array signal and to determine a beamforming signal quality thereof. The antenna array signal is wirelessly transmitted to the receiver by the antenna array of a device under test. The measuring system further comprises a positioning unit configured to position the device under test in successive predefined orientations. The measuring device is configured to receive and measure the antenna array signal successively in each of the predefined orientations.

Abstract: A slide projector that is portable, easy to use and suitable for use by an individual, or individuals in the home. The slide projector comprises means in which to project an image perpendicularly from a slide onto a projection surface. In use, the projected image of the slide lies in a substantially planar surface. The slide is located in a rotating carousel which can be automatically, or manually, rotated, thus providing accurate simulation of the orientation of stars and other celestial bodies at a specific date and time.