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Fourier transform
See FFT.
frequency accuracy
The uncertainty with which the frequency of a signal or spectraI
component is indicated, either in an absolute sense or relative to some
other signal or spectral component. Absolute and relative frequency
accuracies are specified independently.
frequency range
The range over of frequencies which the analyzer performance is
specified. The maximum frequency range of many microwave analyzers
can be extended with the application of external mixers.
frequency resolution
The ability of an analyzer to separate closely spaced spectral components
and display them individually. Resolution of equal amplitude components
is determined by resolution bandwidth. Resolution of unequal amplitude
signals is determined by resolution bandwidth and bandwidth selectivity.
frequency response
The peak-to-peak variation in the displayed signal amplitude over a
specified center frequency range. Frequency response is typically
specified in terms of
fdB
relative to the value midway between the
extremes. It also may be specified relative to the calibrator signal.
frequency span
The magnitude of the displayed frequency component. Span is
represented by the horizontal axis of the display. Generally, frequency
span is given as the total span across the full display. Some analyzers
represent frequency span (scan width) as a per-division value.
frequency stability
The stability of a frequency component to remain unchanged in frequency
or amplitude over short- and long-term periods of time. Stability refers to
the local oscillator’s ability to remain fixed at a particular frequency over
time. The sweep ramp that tunes the local oscillator influences where a
signal appears on the display. Any long-term variation in local oscillator
frequency (drift) with respect to the sweep ramp causes a signal to shift
its horizontal position on the display slowly. Shorter-term local oscillator
instability can appear as random FM or phase noise on an otherwise
stable signal.
Glossary- 10