IMPROVING EMI REJECTION FOR NEAR FIELD LINKS

For near field communications, inductive coils coupled to each communicating circuit are brought close together so that there is 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 susc...

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Bibliographic Details
Main Author RICHARDSON KENNETH G
Format Patent
LanguageChinese
English
Published 06.11.2020
Subjects
DETECTING MASSES OR OBJECTS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
TRANSMISSION
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Summary:For near field communications, inductive coils coupled to each communicating circuit are brought close together so that there is 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 pairs used for transmitting and receiving data, a pair of 'passive' coils is provided, proximate to the active coil pairs, that is only used for detecting the ambient EMI. The EMI signals detected by the passive coils are processed by a noise detector/processor, and the noise detector processor then controls the transmitters and/or receivers to at least partially compensate for the detected EMI signals. Transmitpower or receiver thresholds may be controlled by the noise detector/processor to improve the signal-to-noise ratio, or other compensation techniques can be used. 对于近场通信，将耦合到每个通信电路的电感线圈靠近在一起，以使两个线圈之间存在电感耦合。然后可以在两个电路之间中继数据信号，而
Bibliography:Application Number: CN201980021656