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I
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TO1
Third order intermodulation distortion occurs in a system where two
signals are present. The distortion products are a result of each signal
mixing with the other’s second harmonic. If the two main signals are of
equal power, the two third order distortion products will also be of equal
power. As the power of the two main signals is increased by an equal
amount, the power of the distortion products will increase three times
that amount. Theoretically, there is a power level at which the power
of each distortion product equals the power of the two main signals.
(Practically, it may not be possible to reach this power level because of
compression or limiting.) The Third Order Intercept
(TOI)
is deEned as
the power at which the third order distortion products equals the power
of two equal level test signals.
trace
A trace is made up of a series of data points containing frequency and
amplitude information. The series of data points is often referred to as an
array. Traces A, B, and C are the typical names of traces that analyzer
displays. The number of traces is
speciEc
to the instrument.
units
Dimensions on the measured quantities. Units usually refer to
amplitude quantities because they can be changed. In analyzers with
microprocessors, available units are
dBm
(dB
relative to 1
mW
(milliwatt)
dissipated in the nominal input impedance of the analyzer),
dBmV
(dB
relative to 1
mV
(millivolt)),
dBpV
(dB
relative to 1
pV>,
volts, and in
some analyzers watts.
update
To make existing information current; to bring information up to date
upgrade
To improve the quality or extend the capability of an instrument or
product. Enhancements to upgrade the product. These enhancements can
then be documented in an update package.
variable persistence
A property of the display that allows the adjustment of the trace-fade
rate which is created by the display’s electron beam. It is a capability of
purely analog displays which provides flicker-free trace display regardless
of sweep time.
Glossary-27