Reception circuit and near field communication (NFC) card including same
a technology of near field communication and reception circuit, which is applied in the field of semiconductor integrated circuits, can solve the problems of degradation or interruption of wireless communication between the nfc card and the card reader, and deviations from the operating characteristics described by the standards, and achieve the effect of enhancing communication efficiency and reliability
Active Publication Date: 2020-08-27
SAMSUNG ELECTRONICS CO LTD
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Benefits of technology
The invention provides a NFC card and a reception circuit that can improve communication efficiency and reliability between the two. The reception circuit can efficiently demodulate the NFC card signals, even in challenging conditions, using a simple configuration. The circuit can adapt to changes in the wireless signal to detect the beginning of a pause, reducing power consumption and circuit size. This allows for routine checking of transmission characteristics and improves signal-to-noise ratio. The reception circuit can also act as an analog-to-digital converter based on the selection reference voltage, making it easier to check the transmission characteristics of the NFC card.
Problems solved by technology
However, deviations from the operating characteristics (e.g., signal waveforms) described by the Standards are not uncommon in real world communication environments.
And in certain circumstances, such deviations may result in the degradation or interruption of wireless communication between the NFC card and the card reader.
Method used
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Embodiment Construction
[0027]Various embodiments of the inventive concept will be described in some additional detail with reference to the accompanying drawings. In the drawings, like reference numbers and labels refer to like or similar elements.
[0028]Figure (FIG. 1 is a block diagram illustrating a reception circuit 1000 of a near field communication (NFC) card according to embodiments of the inventive concept.
[0029]Referring to FIG. 1, the reception circuit 1000 comprises an input circuit 100 associated with an antenna ANT, a reference voltage generator 200, a comparison circuit 300 and a reference voltage controller 400. In this regard, the term “NFC card” refers to a device capable of wirelessly communicating (i.e., transmitting and / or receiving) information using pauses. In certain embodiments of the inventive concept, an NFC card may be implemented as a smart card, an integrated circuit card, a contactless card, etc.
[0030]The input circuit 100 may be used to receive a wireless signal EMW including...
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A reception circuit of an NFC card, includes, an input circuit, a reference voltage generator, a comparison circuit and a reference voltage controller. The input circuit receives a wireless signal including pauses and generates an envelope voltage signal. The reference voltage generator generates a detection reference voltage and a selection reference voltage based on the envelope voltage signal and a voltage selection signal. The selection reference voltage varies depending on a minimum voltage level of the pauses. The comparison circuit generates a pause detection signal and a synchronization signal by comparing the envelope voltage signal with the detection reference voltage the selection reference voltage, respectively. The reference voltage controller adjusts a control value of the voltage selection signal based on the pause detection signal and the synchronization signal such that the selection reference voltage is changed depending on the control value of the voltage selection signal.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This U.S. non-provisional application claims priority under 35 USC § 119 to Korean Patent Application No. 10-2019-0022755 filed on Feb. 26, 2019, the subject matter of which is hereby incorporated by reference.BACKGROUND1. Technical Field[0002]Embodiments of the inventive concept relate generally to semiconductor integrated circuits. More particularly, embodiments of the inventive concept relate to reception circuits and near field communication (NFC) cards including the reception circuit.2. Discussion of the Related Art[0003]Certain communication techniques (or protocols) using contactless NFC cards are described by the International Organization for Standardization and the International Electrotechnical Commission (ISO / IEC) 14443 standards (hereafter, “Standards”). The Standards describe, for example, rise / fall time(s), modulation index(es), etc., associated with transmission signal(s) exchanged between a card reader to an NFC card. The ...
Claims
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IPC IPC(8): G06K7/10G06K19/07
CPCG06K7/10237G06K19/0723Y02D30/70G06K19/07749
Inventor KIM, KYEONG-DOKIM, JUN-HO
Owner SAMSUNG ELECTRONICS CO LTD