US 2024/0330613 A1 · RECEPTION CIRCUIT AND SMART CARD INCLUDING THE SAME

Abstract

The present disclosure provides systems and devices including reception circuits for communications between smart cards and card readers. In some embodiments, a reception circuit of a smart card includes a first circuit and a second circuit. The first circuit is configured to receive a wireless signal including a pause, and restore the wireless signal to a clock signal. The second circuit is configured to charge a voltage of a first node based on a first logic level of the clock signal, compare the voltage of the first node with a predefined reference voltage, and output, based on the comparison of the voltage of the first node, a synchronization signal indicating a rising starting time point of the pause of the wireless signal.

Claims20

Dependent claims

A reception circuit of a smart card, comprising:

a first circuit configured to:
receive a wireless signal comprising a pause;
and
restore the wireless signal to a clock signal;
and
a second circuit configured to:
charge a voltage of a first node based on a first logic level of the clock signal;
compare the voltage of the first node with a predefined reference voltage;
and
output, based on the comparison of the voltage of the first node, a synchronization signal indicating a rising starting time point of the pause of the wireless signal.

7 more elements

A smart card, comprising:

an antenna configured to transmit a first wireless signal and receive a second wireless signal;
and
a smart card chip configured to:
receive, from the antenna, the second wireless signal comprising a pause;
output a clock signal based on the second wireless signal;
generate a node voltage based on a logic level of the clock signal;
compare the node voltage with a reference voltage;
output a synchronization signal that is activated based on whether the node voltage is greater than the reference voltage;
and
demodulate the synchronization signal to generate a demodulation signal.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/370,118Filed 19 Sep 2023

Priority

KR 10-2023-004156829 Mar 2023

Published

3 Oct 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

G06K 7/0166
Synchronisation of sensing process: by means of clock-signals derived from the code marks, e.g. self-clocking code
G06K 7/0008
Methods or arrangements for sensing record carriers, e.g. for reading patterns: general problems related to the reading of electronic memory…
G06K 19/0723
With integrated circuit chips: the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on…
G06K
Graphical data reading

Reception circuit and smart card including the same

Life of this patent

Reception circuit and smart card including the same

Life of this patent

Abstract

Claims20