Sierra Wireless AirPrime MC7354B, Руководство по интеграции оборудования

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4117529 Rev 1.0 June 12, 2015 12
Hardware Integration Guide RF Integration
3.5. RF Desense Sources
Common sources of interference that may affect the module’s RF performance (RF desense) which
include:

Power supply noise

Can lead to noise in the RF signal

Module power supply ripple limit <= 100 mVp-p 1 Hz
–100 kHz

Interference from other embedded wireless devices

Any harmonics, sub-harmonics, or cross-
products of signals that fall in the module’s Rx
range may cause spurious response, resulting in decreased Rx performance.

Tx power and corresponding broadband noise may overload or increase the noise floor of
the module’s receiver, resulting in RF desense.
 Severity of interference depends on proximity of other antennas to the module’s
antennas.

Host electronic device-generated RF
 Proximity of host electronics to the module’s antenna can contribute to decreased Rx
performance.

Some devices include microprocessor and memory, display panel and display drivers,
and switching mode power supplies.
Note: In practice, there are usually numerous interfering frequencies and harmonics. The net effect can
be a series of desensitized receive channels.