Abstract: In an apparatus and by a method for detecting a tag having a transponder for identification by electromagnetic waves (RFID), a synchronization unit is electromagnetically coupled to the transponder and outputs a trigger signal for activating a supplementary system based on the occurrence of data interchange with the transponder. Any desired devices can therefore be easily activated and uniquely identified using an identification number of the transponder.

Abstract: In an apparatus and by a method for detecting a tag having a transponder for identification by electromagnetic waves (RFID), a synchronization unit is electromagnetically coupled to the transponder and outputs a trigger signal for activating a supplementary system based on the occurrence of data interchange with the transponder. Any desired devices can therefore be easily activated and uniquely identified using an identification number of the transponder.

Abstract: A method is disclosed for checking the switching region of a touch-free switching system with at least one sensor and at least one signal emitter, wherein the signal emitter sends data to the sensor. An extremely flexible and practical switching region check is achieved in at least one embodiment by the fact that a change in at least one system parameter of the switching system derives at least one first piece of information on the position of the signal emitter. The method represents an inexpensive possibility for checking a switching region, which has options for the definition and allocation of the switch-on, switch-off, and hysteresis regions.

Abstract: A method is disclosed for checking the switching region of a touch-free switching system with at least one sensor and at least one signal emitter, wherein the signal emitter sends data to the sensor. An extremely flexible and practical switching region check is achieved in at least one embodiment by the fact that a change in at least one system parameter of the switching system derives at least one first piece of information on the position of the signal emitter. The method represents an inexpensive possibility for checking a switching region, which has options for the definition and allocation of the switch-on, switch-off, and hysteresis regions.

Abstract: Anti-theft protection system for a motor vehicle, and a method for operating an anti-theft protection system. The anti-theft protection system has a transmitting and receiving unit in the motor vehicle, which transmits radar signals modulated over a broad bandwidth and then waits for echo signals. A code transmitter, which receives a radar signal, for its part sends back an additionally modulated and coded signal. An evaluation unit analyses all the received echo signals firstly for authorization of the code transmitter and secondly in order to determine the distance between the code transmitter and the transmitting and receiving unit.

Abstract: The invention relates to a device and a method for producing an oscillator signal based on a base signal. Said oscillator signal is actively constructed by an oscillator. The oscillator can be quasi-phase-coherently excited by the base signal.

Abstract: Anti-theft protection system for a motor vehicle, and a method for operating an anti-theft protection system. The anti-theft protection system has a transmitting and receiving unit in the motor vehicle, which transmits radar signals and then waits for echo signals. A code transmitter, which receives a radar signal, modulates this signal and sends it back. An evaluation unit analyses all the received echo signals firstly for authorization of the code transmitter and secondly in order to determine the relative interior/exterior position of the code transmitter with respect to the motor vehicle.

Abstract: The invention relates to a device and a method for producing an oscillator signal based on a base signal. Said oscillator signal is actively constructed by an oscillator. The oscillator can be quasi-phase-coherently excited by the base signal.

Abstract: A method for detecting and correcting non-linearities in radio-frequency, voltage controlled oscillators provides for digitization of the frequency signal by feeding the undelayed frequency signal and a delayed frequency signal generated therefrom into EXOR gates. The digital pulses produced thereform are converted using a low pass filter into a proportional DC voltage value which is proportional to the oscillator frequency and is used as a basis for producing a correction value for the frequency control of the oscillator.

Abstract: Anti-theft protection system for a motor vehicle, and a method for operating an anti-theft protection system. The anti-theft protection system has a transmitting and receiving unit in the motor vehicle, which transmits radar signals modulated over a broad bandwidth and then waits for echo signals. A code transmitter, which receives a radar signal, for its part sends back an additionally modulated and coded signal. An evaluation unit analyses all the received echo signals firstly for authorization of the code transmitter and secondly in order to determine the distance between the code transmitter and the transmitting and receiving unit.

Abstract: Anti-theft protection system for a motor vehicle, and a method for operating an anti-theft protection system. The anti-theft protection system has a transmitting and receiving unit in the motor vehicle, which transmits radar signals and then waits for echo signals. A code transmitter, which receives a radar signal, modulates this signal and sends it back. An evaluation unit analyses all the received echo signals firstly for authorization of the code transmitter and secondly in order to determine the relative interior/exterior position of the code transmitter with respect to the motor vehicle.