Patent ID: 8766776

Claim:
A transponder for transferring data to a reading device using an electromagnetic field, comprising: a receiver arranged to receive a clock signal emitted by the reading device at a clock frequency; a frequency generator configured to generate a frequency generator frequency which is employed for clocking transfer of the data; a frequency comparator which is configured to determine a frequency difference between the clock frequency and the frequency generator frequency; and a device arranged to restrict the data block size of the data to a data block size dependent on the frequency difference, wherein the device restricting the data block size of the data is configured to restrict the data block size to the following data block size Byte MaxBlock dependent on the frequency difference: Byte MaxBlock ≦[ΔPulse max ·f c ]/[| |·Bit Byte ·Pulse Bit ], (1) where Byte MaxBlock is the data block size in bytes per data block, f c is the frequency generator frequency, is the frequency difference between the clock frequency and the frequency generator frequency, Bit Byte is the number of bits per byte, Pulse Bit is the number of pulses of the frequency generator signal per bit, and ΔPulse max is a constant which is smaller than Pulse Bit /2 or Pulse Bit /4 or smaller than or equal to Pulse Bit /8.