Integrated circuit comprising a clock generator, a chip card comprising one such integrated circuit and the associated clock generation method
First Claim
1. A contactless integrated circuit receiving an RF signal, wherein the circuit comprises a clock-signal generator to produce a clock signal by the comparison of a first half wave with a second half wave representing the received RF signal.
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Accused Products
Abstract
A contactless integrated circuit receiving an RF signal comprises a clock-signal generator to produce a clock signal from a first half wave and a second half wave representing the received RF signal. Also disclosed is a method for the generation of a clock signal in which the first half wave and the second half wave are compared to produce the clock signal. The invention is adapated for use in contactless cards, transponders, and the like.
9 Citations
15 Claims
- 1. A contactless integrated circuit receiving an RF signal, wherein the circuit comprises a clock-signal generator to produce a clock signal by the comparison of a first half wave with a second half wave representing the received RF signal.
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4. An integrated circuit according to claim 4, comprising also:
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a fifth transistor series-connected between the first transistor and the second transistor, a source and a drain of the fifth transistor being connected respectively to a drain of the first transistor and to the drain of the second transistor, and a sixth transistor series-connected between the third transistor and the fourth transistor, a source and a drain of the sixth transistor being connected respectively to a drain of the third transistor and to the drain of the fourth transistor, an enabling signal being applied to a gate of the fifth transistor and to a gate of the sixth transistor (T66) connected together. - View Dependent Claims (5, 6, 11, 12, 13, 15)
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7. A method for the production of a clock signal in a contactless integrated circuit wherein, during the method, a comparison is made between a first half wave and a second half wave representing an RF signal received by the integrated circuit, the clock signal being the result of the comparison.
Specification