Contactless integrated circuit with reduced power consumption
First Claim
1. Contactless integrated circuit (IC1) comprising a device (LMC) for modulating the load of an antenna coil (Ls), a device (CEC1) for extracting a clock (H), and means for delivering a load modulation signal according to a binary signal to be transmitted (DTx), characterized in that it comprises means (CC1) for delivering a pulsed load modulation signal (Slm4) comprising a series of load modulation pulses (I1-In), the duration of which is asynchronously calibrated by the charge or the discharge of at least one capacitor (Cas).
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Abstract
An integrated circuit with contactless functioning including devices for modulating the load of the an antenna coil, extracting a clock signal, and delivering a pulsed load modulating signal comprising a series of load modulating pulses with duration asynchronously calibrated by the charge or discharge of a capacitor and for inhibiting the clock extraction device at least while load modulating pulses are being emitted. The invention permits the reduction of the integrated circuit power consumption during data transmission intervals.
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11 Claims
- 1. Contactless integrated circuit (IC1) comprising a device (LMC) for modulating the load of an antenna coil (Ls), a device (CEC1) for extracting a clock (H), and means for delivering a load modulation signal according to a binary signal to be transmitted (DTx), characterized in that it comprises means (CC1) for delivering a pulsed load modulation signal (Slm4) comprising a series of load modulation pulses (I1-In), the duration of which is asynchronously calibrated by the charge or the discharge of at least one capacitor (Cas).
Specification