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Command Reference
GDEL specifies group delay trace coordinates. Group delay is the derivative of phase with
respect to frequency, −
aperture (∆f) is specified with the CALC:GDAP:APER command.
Note
Digital demodulation features are implemented only if option AYA (vector
modulation analysis) is installed in the analyzer.
The following display formats are part of option AYA.
COMP specifies a complex polar vector diagram, with the real part on the x axis and the
imaginary part on the y axis. When the instrument mode is digital demod, this is an IQ diagram,
with the in-phase signal on the x axis and the quadrature-phase signal on the y axis.
The complex diagram differs from the constellation diagram in that the constellation diagram
shows information only at specified time intervals; the symbol clock times.
CONS specifies a constellation polar vector diagram. This is a time-domain diagram. It displays
information only at symbol clock times (detection decision-points) and the displayed points are
called symbols.
IEYE specifies the in-phase eye diagram.
QEYE specifies the quadrature-phase eye diagram.
TEYE specifies the trellis eye diagram.
For more information on these display types, see online help and the concepts discussion in the
Operator's Guide.
58
⁄
. In this analyzer it is approximated by the function −
dϕ
df
∆ϕ
⁄
∆f
. The
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