Abstract: A communication device having an antenna resonant circuit, an antenna driver which is configured to feed a carrier wave to the antenna resonant circuit, and a controller which is configured to detect that a synchronization period is imminent and is configured to control the antenna driver in such a way that the antenna driver feeds the inverted carrier wave to the antenna resonant circuit.

Abstract: A communication device having an antenna resonant circuit, an antenna driver which is configured to feed a carrier wave to the antenna resonant circuit, and a controller which is configured to detect that a synchronization period is imminent and is configured to control the antenna driver in such a way that the antenna driver feeds the inverted carrier wave to the antenna resonant circuit.

Abstract: A contactless device including a transmission antenna configured to transmit a transmission signal; a pickup antenna configured to detect a field generated by a pickup signal, which comprises a response signal transmitted from another contactless device and the transmission signal; and a cancellation circuit configured to subtract a voltage of the transmission antenna from a voltage of the pickup antenna.

Abstract: A demodulator includes a sampler configured to sample a plurality of first amplitude values of a modulated carrier signal using a constant sampling frequency and a plurality of second amplitude values of the modulated carrier signal at different times using the same constant sampling frequency. The constant sampling frequency is equal to a carrier frequency of the modulated carrier signal with a tolerance of +/?1% of the carrier frequency.

Abstract: A contactless device having an energy antenna configured to transmit/receive an energy signal; and a data antenna configured to transmit a data signal. Also, a method for transmitting a contactless signal including transmitting/receiving an energy signal from an energy antenna of a contactless device; and transmitting a data signal from a data antenna of the contactless device.

Abstract: A demodulator includes a sampler and a trigger unit. The sampler is configured to sample a carrier signal based on a trigger signal to obtain a demodulated signal. The trigger unit is configured to detect a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal. Further, the trigger unit is configured to provide the trigger signal based on the detected zero crossing or the detected extreme value, so that the carrier signal is sampled by the sampler with a predefined phase shift to the detected zero crossing or the detected extreme value. The predefined phase shift is larger than 30° plus an integer multiple of 90° and lower than 60° plus the same integer multiple of 90° in reference to the carrier signal.

Abstract: A passive RFID transponder includes a coder and a modulator. The coder generates a digital coded data stream based on a digital data stream to be transmitted. The digital coded data stream includes an initialization bit sequence having a maximum data frequency of the digital coded data stream. Furthermore, the digital coded data stream changes its value at the latest after a predefined number of bits. The modulator modulates an amplitude of a carrier signal with the digital coded data stream to provide an amplitude-modulated coded signal.

Abstract: A demodulator includes a sampler and a trigger unit. The sampler is configured to sample a carrier signal based on a trigger signal to obtain a demodulated signal. The trigger unit is configured to detect a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal. Further, the trigger unit is configured to provide the trigger signal based on the detected zero crossing or the detected extreme value, so that the carrier signal is sampled by the sampler with a predefined phase shift to the detected zero crossing or the detected extreme value. The predefined phase shift is larger than 30° plus an integer multiple of 90° and lower than 60° plus the same integer multiple of 90° in reference to the carrier signal.

Abstract: A demodulator includes a sampler configured to sample a plurality of first amplitude values of a modulated carrier signal using a constant sampling frequency and a plurality of second amplitude values of the modulated carrier signal at different times using the same constant sampling frequency. The constant sampling frequency is equal to a carrier frequency of the modulated carrier signal with a tolerance of +/?1% of the carrier frequency.

Abstract: A passive RFID transponder includes a coder and a modulator. The coder generates a digital coded data stream based on a digital data stream to be transmitted. The digital coded data stream includes an initialization bit sequence having a maximum data frequency of the digital coded data stream. Furthermore, the digital coded data stream changes its value at the latest after a predefined number of bits. The modulator modulates an amplitude of a carrier signal with the digital coded data stream to provide an amplitude-modulated coded signal.

Abstract: A contactless device having an energy antenna configured to transmit/receive an energy signal; and a data antenna configured to transmit a data signal. Also, a method for transmitting a contactless signal including transmitting/receiving an energy signal from an energy antenna of a contactless device; and transmitting a data signal from a data antenna of the contactless device.

Abstract: A contactless device including a transmission antenna configured to transmit a transmission signal; a pickup antenna configured to detect a field generated by a pickup signal, which comprises a response signal transmitted from another contactless device and the transmission signal; and a cancellation circuit configured to subtract a voltage of the transmission antenna from a voltage of the pickup antenna.