Справочник Пользователя для Sierra Wireless MC7354B
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:
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.
the module’s receiver, resulting in RF desense.
Severity of interference depends on proximity of other antennas to the module’s
antennas.
antennas.
Host electronic device-generated RF
Proximity of host electronics to the module’s antenna can contribute to decreased Rx
performance.
performance.
Some devices include microprocessor and memory, display panel and display drivers,
and switching mode power supplies.
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.
be a series of desensitized receive channels.