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Improved emi rejection for near-field links

A near-field and near-field communication technology, which is applied in the field of near-field RF communication circuits, can solve the problems of electronic equipment being susceptible to EMI, increasing signal delay, and increasing costs.

Active Publication Date: 2022-07-22
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Optical links are not susceptible to electromagnetic interference (EMI), but the electronics in the photodiode detector circuit are susceptible to EMI
Shielding of the connectors can be used to mitigate the effects of ambient EMI, and internal EMI shielding can be added to the package, but this shielding adds cost
A filter to filter out EMI can be added to the receiver, but adds signal delay

Method used

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  • Improved emi rejection for near-field links
  • Improved emi rejection for near-field links
  • Improved emi rejection for near-field links

Examples

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Embodiment Construction

[0024] figure 1 IC package 10 is shown containing two dies 12 and 14 . Package 10 has terminals for connection to a printed circuit board. The two dies 12 and 14 include any circuitry required to communicate between the dies 12 and 14 . Although analog information can also be conveyed, digital data is assumed in the embodiments.

[0025] In dies 12 and 14, only the transmitter and receiver are shown for the four communication channels, as the other circuits in the die that generate the baseband data can be any conventional circuits for any application. Active transmitters 16 and 16A and active receivers 18 and 18A are in die 12 , and active transmitters 20 and 20A and active receivers 22 and 22A are in die 14 . There may be more or fewer communication channels. The transmitter and receiver can also be transceivers, where the transmit and receive functions use the same antenna. The transmitter can receive baseband data and modulate the RF carrier, eg, at a frequency of abo...

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Abstract

For near field communication, the inductive coils coupled to each communication circuit are brought close together so that there is an inductive coupling between the two coils. Data signals can then be relayed between the two circuits without any direct connection between them. However, the system is susceptible to common mode noise such as ambient EMI. In addition to the "active" coil pair for sending and receiving data, a pair of "passive" coils are provided close to the "active" coil pair, which are used only to detect ambient EMI. The EMI signal detected by the passive coil is processed by a noise detector / processor, which then controls the transmitter and / or receiver to at least partially compensate for the detected EMI signal. The transmit power or receiver threshold can be controlled by a noise detector / processor to improve the signal-to-noise ratio, or other compensation techniques can be used.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application is based on and claims priority to US Provisional Patent Application Serial No. 62 / 647,464, filed March 23, 2018, by Kenneth G. Richardson, which is hereby incorporated by reference. technical field [0003] The present invention relates to circuits that communicate with each other using near field RF, which provides galvanic isolation between the circuits, and in particular, to reducing the effect of common mode noise on the quality of communications. Background technique [0004] In some cases, it is desirable to electrically isolate two circuits from each other while enabling the circuits to communicate. This may be done to isolate circuit grounds from each other, or to reduce noise coupling between one circuit and another, or for other purposes. Common techniques for this "galvanic isolation" include the use of transformers or optical links. [0005] Transformers tend to be relatively large and ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B15/00G01V3/10H04B5/00
CPCH04B15/005H04B1/12H04B1/525H01F27/33H01F38/14G01V3/107H04B5/263H04B5/266H01L23/66H01L2223/6677H04B5/72
Inventor K·G·理查森
Owner ANALOG DEVICES INC