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22 Chapter 1
Signal Generator Overview
Rear Panel Overview
9. Q-bar OUT Connector
Q-bar is used in conjunction with Q to provide a balanced baseband stimulus. Balanced
signals are signals present in two separate conductors that are symmetrical relative to
ground, and are opposite in polarity (180 degrees out of phase). The nominal output
impedance of this connector is 50
, DC-coupled. The damage levels are > +2 V and < 2V. The
DC origin offset is typically < 10 mV. The output signal levels into a 50
load are as follows:
0.5 V
pk
, typical, corresponds to one unit length of the I/Q vector.
•0.69 V
pk
(2.84 dB), typical, maximum crest factor for peaks for π/4 DQPSK with
alpha = 0.5.
•0.71 V
pk
(3.08 dB), typical, maximum crest factor for peaks for π/4 DQPSK with
alpha = 0.35.
Typically 1 V
p-p
maximum (Option 001 or 002 only).
This female BNC connector is provided only on signal generators with Option 001 or 002. If
you configure your signal generator with Option 1EM, this output is relocated from a BNC to
an SMB connector.
10. EVENT 1 Connector
With Option 001 or 002 installed, this connector outputs a pulse that can be used to trigger
the start of a data pattern, frame, or timeslot. It is adjustable to within plus or minus one
timeslot with one bit of resolution. With Option 401 installed (Option 401 requires Option 001
or 002 hardware), an even second output is generated. A marker is output every two seconds
indicating the beginning of each short code sequence for use in synchronizing CDMA analysis
instruments.
With Option 001 or 002 installed, there is a marker on/off condition associated with each
waveform point. A marker (3.3 V CMOS high when positive polarity is selected; 3.3 V CMOS
low when negative polarity is selected) is output on the EVENT 1 connector whenever a
Marker 1 is turned on in the waveform. (Markers are automatically turned on whenever you
set them in a waveform segment. When you combine waveform segments that contain Marker
1 into a sequence, the markers are automatically turned off until you toggle them on in either
the Edit Selected Waveform Sequence menu or in the Build New Waveform Sequence menu.)
The damage levels for this connector are > +8 V and <
4 V. This female BNC connector is
provided only on instruments with Option 001 or 002. If you configure your signal generator
with Option 1EM, this output is changed from a BNC to an SMB connector. With Option 401
you can select from several different output signals for this connector.
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