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Data carrier having rectifier and improved voltage limiter

  • US 6,304,613 B1
  • Filed: 05/03/1999
  • Issued: 10/16/2001
  • Est. Priority Date: 05/05/1998
  • Status: Expired due to Term
First Claim
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1. A data carrier processing system comprising:

  • a receiver adapted to receive and to supply a carrier signal which has been amplitude-modulated in dependence on transmitted data, one or more rectifiers, operably coupled to the carrier signal, that are adapted to generate a d.c. supply voltage corresponding to the carrier signal, a voltage limiter adapted to limit the d.c. supply voltage to a first limit value, a demodulator, operably coupled to the carrier signal, that is adapted to supply a data signal representative of the transmitted data, and a processor adapted to process the data signal supplied by the demodulator, the processor having a power supply input that is arranged to receive the d.c. supply voltage, wherein;

    the voltage limiter is adapted to limit the d.c. supply voltage to the first limit value with a delay to amplitude variations in the carrier signal, the voltage limiter is further adapted to limit the d.c. supply voltage to a second limit value without delay to amplitude variations in the carrier signal, and the second limit value is higher than the first limit value.

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