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Method, system and smart card for processing baseband signals in DC suppressed system

A baseband signal and DC suppression technology, applied in the field of smart cards, can solve problems such as high cost, difficulty in designing transceiver structure, and large size of analog devices

Active Publication Date: 2016-03-09
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the cutoff frequency of the high-pass filter and inserting a differentiator immediately after the ADC results in a larger analog component size and thus higher cost
Additionally, it is difficult to design a transceiver structure that can accommodate the required analog components

Method used

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  • Method, system and smart card for processing baseband signals in DC suppressed system
  • Method, system and smart card for processing baseband signals in DC suppressed system
  • Method, system and smart card for processing baseband signals in DC suppressed system

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Embodiment Construction

[0019] It should be readily understood that the components of the various embodiments described herein and shown in the accompanying drawings may be designed and configured in various configurations. Therefore, various embodiments described in detail below are not intended to limit the scope of the present invention, but merely represent various embodiments. While the various aspects of the embodiments are presented in drawings, these drawings are not necessarily drawn to scale.

[0020] The embodiments described herein are only used to illustrate the present invention and not to limit the present invention. Accordingly, the scope of the invention is defined by the appended claims rather than by the detailed description. Any changes made within the protection scope of the present invention are included in the protection scope of the present invention.

[0021] Recited features, advantages or similar terms herein do not imply that all of the features and advantages that can b...

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PUM

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Abstract

The present invention proposes a method, a system and a smart card for processing baseband signals in a DC suppression system. In one embodiment, a method for processing a baseband signal in a DC-rejected system includes: processing the baseband signal in the analog domain with a first high-pass filter, converting the processed baseband signal into a digital signal, and applying a second high-pass filter to Filters process digital signals in the digital domain to provide a discrete-time difference of the baseband signal. Other embodiments are also described herein.

Description

technical field [0001] The present invention relates to a method, a system and a smart card for processing baseband signals in a DC suppression system. Background technique [0002] Smart cards include embedded integrated circuits that can be used to store information and perform data processing. For example, portable smart cards can be used in financial, transportation, security, medical or other applications to provide identification and authentication. Types of smart cards include contact smart cards, which communicate through electrical contacts, and contactless smart cards, which communicate wirelessly. For example, a contactless smart card can communicate with and be powered by a smart card reader by electromagnetic induction. In some cases, the contactless smart card does not include an internal power supply, the contactless smart card uses an inductor as its antenna to capture the electromagnetic interrogation signal to power the card's electronic circuitry. [00...

Claims

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Application Information

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IPC IPC(8): H04B5/00G06K19/077
CPCH04L25/06H04B1/0003H04L25/0266H04B5/26H04B1/16H04L25/03
Inventor 马西莫·恰奇雷默克·科内利斯·荷曼·范德贝克吉亚斯·阿尔-卡迪
Owner NXP BV