26 Keysight EXG and MXG X-Series Signal Generators User’s Guide
Models, Options, and Front/Rear Panels for All Models
Rear Panel Overview (N5171B, N5172B, N5181B, & N5182B)
Digital Modulation Connectors (N5172B/82B RF Vector Models Only)
I OUT, Q OUT, OUT, OUT
BB TRIG 1 & BB TRIG 2
EVENT 1
OUT and OUT, require Option 1EL.
Connector Type: female BNC Impedance: 50 Ω
DC–coupled
Signal
I OUT The analog, in–phase component of I/Q modulation from the internal baseband generator.
Q OUT The analog, quadrature–phase component of I/Q modulation from the internal baseband
generator.
OUT
Used in conjunction with the I OUT connector to provide a balanced
a
baseband stimulus.
a. 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).
OUT
Used in conjunction with the Q OUT connector to provide a balanced
a
baseband stimulus.
Damage Levels > 1 Vrms DC Origin
Offset
typically <10 mV
Output Signal Levels into a 50 Ω Load
—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,
alpha = 0.5
— 0.71 V
pk
(3.08 dB), typical, maximum crest factor for peaks for π/4 DQPSK,
alpha = 0.35
—Typically 1 V
p–p
maximum
Connector female BNC Impedance nominally 50 Ω
Signal Reserved for arbitrary and real-time baseband generators I/O, such as markers or trigger inputs.
Connector female BNC Impedance: nominally 50 Ω
Signal A pulse that can be used to trigger the start of a data pattern, frame, or timeslot.
Adjustable to ± one timeslot; resolution = one bit
Markers
Each Arb–based waveform point has a marker on/off condition associated with it.
Marker 1 level =
+3.3 V CMOS high (positive polarity selected);
–3.3 V CMOS low (negative polarity selected).
Output on this connector occurs whenever Marker 1 is on in an Arb–based waveform.
See
“Using Waveform Markers” on page169.
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