Chapter 4. Introduction

Fig.4. With the amplitude analysis, spectrum analysis is
the optimal solution to diagnose the harmonic
components. Especially for engineers involving in the
harmonic distortion for communication system, the
distortion of message modulated onto a carrier.

Secondly, spectral occupancy has become more and
more pervasive in frequency analysis around our lives. In
order to prevent interference with adjacent signals,
regulatory agencies restrict the spectra bandwidth of
various transmissions. Electromagnetic Interference
(EMI) that is ubiquitous around our life space. With the
increasing use of electronic product and system to
expand the application aspects including avionics,
medical instruments, computer equipment and mobile
communication product enhance the escalating intensity
of system use. Thus may cause the growth of EMI effect
around the systems. As shown in Fig.4, in case of
boosting the capability to immunize the EMI or inhibit the
self-generated EMI so as to reduce the distortion on other
electronics, the EMI protection design is more and more
significant. With the advancement of high-tech
development, the issues of either conducted EMI or
radiated EMI come out and diffuse over the broad
electronic applications. The increasing operating speed
and integrated density of semiconductor devices are.
enlarging the higher noise level than before so that many
of the distortion sources of signal become hard to detect
and recognize. Therefore, it is necessary to build the
causes and effects methodology by way of the correct
measurement to maintain the electromagnetic
compatibility, to target the electromagnetic interference,
and to detect radio frequency interference. As depicted in
Fig.4, a package for spectrum analyzer with EMI
diagnosis kits is the best solution to quickly diagnose
EMI issues.