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Confidential
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Introduction: What is PIM ?
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Passive Intermodulation (PIM) is a signal distortion that occurs when
signals at several frequencies are transmitted through a passive device
(connector, cable, switch, antennas…) which has some non-linear
response. In return the fundamental frequencies will be distorted and
series of higher order harmonic frequencies will appear in the frequency
domain. If some of these frequencies appear in the receiving band of a
wireless system it will raise the receiver floor noise and reduce the
system performance.
The main sources of intermodulation in wireless systems are the active
devices in transceivers and receivers. Their intermodulation can be
reduced or eliminated by filtering which is not possible for passive devices
inserted in transmission line. Therefore when intermodulation becomes
critical for a system the only solution is to use Low PIM passive devices.
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2/21/2014
Confidential
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DSP and ARM Processors
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