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RF DeSense GSM/WCDMA/wifi/GPS

时间:04-07 整理:3721RD 点击:
Hello,
I am trying to learn the major causes of desense on GSM/WCDMA/wifi/GPS systems. What are the major sources of desense on a phone packed with all these standards, how to mitigate the desense?

-USB cable can affect 2G/3G RX channels
-WCDMA TX can affect WCDMA RX channels
-2G/3G can affect GPS signals
- etc


I am looking for a comprehensive study or book on the general topic of RF desense/ how to improve ? Anybody can help?

thanks
hilbert

Receiver desense represents the degradation of the receiver sensitivity by multiple possible factors, which can be internal, external, inband, out-of-band, transmitted conducted, radiated (or both in the same time).
This is a very critical unwanted phenomenon that can affect wireless devices, especially those using digital modulations, and use high level of system integration and working on multiple networks and bands.

A perfect design is one that cares in the same time about every step as: good PCB design, good component and blocks placement, good shielding of critical stages, good RF system design (levels, filtering, noise, spurious, etc), good routing and shielding of critical digital cables (flex of LCD, camera, HDMI, etc), and at the end (but maybe most important) antenna isolation from the sources of interferers.

There is no simple cure to fix receiver desense.

Even an almost perfect design can get desense due to a combination of factors, issues that sometimes needs weeks of work to be discovered.
Books or studies would help a little and just informative, because each design has its own particular issues.

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