User`s guide

Agilent X-Series Signal Generators User’s Guide 395
Glossary
A
Active Entry The currently selected, and
therefore editable, entry or parameter
ARB Arbitrary waveform generator
AWG Arbitrary waveform generator. Additive
white Gaussian noise
B
BBG Media Baseband generator media. Volatile
memory, where waveform files are played or
edited.
BNC Connector Bayonet Neill- Concelman
connector. A type of RF connector used to
terminate coaxial cable.
C
CCW Counterclockwise
C/N Carrier- to- noise ratio
CW Continuous wave. Clockwise
D
DHCP Dynamic host communication protocol
Dwell Time In a step sweep (see page 52), the
time that the signal is settled and you can make
a measurement before the sweep moves to the
next point.
E
EVM Error vector magnitude; the magnitude of
the vector difference at a given instant between
the ideal reference signal and the measured
signal.
F
Filter factor Alpha The filter’s alpha coefficient.
It is only valid for root nyquist and nyquist
filters.
Filter Factor BbT The filter’s
bandwidth-bit-time (BbT). It is only valid for a
Gaussian filter (similar to alpha). BbT is defined
by the GSM standard as 0.3 and by the DECT
standard as 0.5.
G
Gaussian filter The Gaussian filter does not
have a zero Inter- Symbol Interference (ISI).
Wireless system architects must decide just how
much of the ISI can be tolerated in a system and
combine that with noise and interference. The
Gaussian filter is gaussian shaped in both the
time and frequency domains, and it does not
ring like the root nyquist filters do. The effects
of this filter in the time domain are relatively
short and each symbol interacts significantly (or
causes ISI) with only the preceding and
succeeding symbols. This reduces the tendency
for particular sequences of symbols to interact,
which makes amplifiers easier to build and more
efficient.
GPIB General purpose interface bus. An 8- bit
parallel bus common on test equipment.
H
Hardkey A labeled button on the instrument.
I
IF Intermediate frequency
Int Media Internal media. Non−volatile signal
generator memory, where waveform files are