摘要:
A contactless data storage medium has at least two antennas, in each case for different transmission bands. This makes it possible to configure a data storage medium such that it can be operated with read/write units that operate in accordance with different standards. At least two of the antennas form a unit, so that a configuration such as this can be produced at very low cost.
摘要:
A device for providing a supply voltage and a load modulation in a transponder with a unit having a resistance controllable by a control signal at a control input thereof, a unit for applying a load modulation signal to the control input, and a unit for applying a voltage limitation control signal to the control input.
摘要:
A contactless communication device including an energy interface configured to activate the contactless communication device or a contactless communication partner based on a first carrier signal; and a contactless high speed data interface configured to enable data communication between the contactless communication device and the contactless communication partner based on a second carrier signal having a frequency greater than a high frequency (HF).
摘要:
A communication system includes at least one contactless card configured to transmit an encoded identifier; and a reader configured to receive the encoded identifier and compare the received encoded identifier with an encoded reference card identifier, wherein the reader requests data from the contactless card if the encoded identifier matches the encoded reference card identifier.
摘要:
According to an embodiment, a chip card communication arrangement is provided comprising a matching network and a chip card communication circuit comprising at least one matching network terminal, a receiver coupled to the matching network via the at least one matching network terminal and an active transmitter coupled to the matching network via the at least one matching network terminal.
摘要:
An RFID transponder having an adjustable response field strength including a determination circuit formed to determine a quantity which is derivable from a field strength of an electromagnetic field prevailing at the location of the RFID transponder, a comparator formed to compare the determined quantity derived from the field strength with a threshold value, wherein the threshold value is based on the adjustable response field strength, which is higher than the minimum field strength required for the operation of the RFID transponder, and a deactivator formed to deactivate a functionality of the RFID transponder if the derived quantity falls below the threshold value.
摘要:
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.
摘要:
A demodulator is provided for demodulating a phase-modulated data signal. The demodulator includes a phase frequency detector to output a voltage representing a phase difference between a received phase-modulated data signal and a reference clock signal. The voltage is input to first and second phase change detectors, which are provided to measure the phase difference of the phase-modulated data signal during first and second time periods, respectively.
摘要:
A high frequency (HF) converter for a mobile device, having an input device configured to receive a first signal including data in accordance with a standard, non-HF communication protocol or in accordance with an HF communication protocol; a converter device coupled to the input device, the converter device configured to convert the first signal to a second signal including the data in accordance with the other of the HF communication protocol and the standard, non-HF communication protocol; and an output device configured to transmit the second signal.
摘要:
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.