Agilent Technologies E8257D, User Manual

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34 Chapter 1
Signal Generator Overview
Rear Panel
40. SYMBOL SYNC
This female BNC input connector (E8267D only) is CMOS–compatible and accepts an externally
supplied symbol synchronization signal for use with the internal baseband generator
(Option 601/602). The expected input is a 3.3 V CMOS bit clock signal (which is also TTL
compatible). SYMBOL SYNC might occur once per symbol or be a single one–bit–wide pulse that is
used to synchronize the first bit of the first symbol. The maximum clock rate is 50 MHz. The damage
levels are > +5.5 V and <
−
0.5V. The nominal input impedance is not defined. SYMBOL SYNC can be
used in two modes:
• When used as a symbol synchronization in conjunction with a data clock, the signal must be high
during the first data bit of the symbol. The signal must be valid during the falling edge of the
data clock signal and may be a single pulse or continuous.
• When the SYMBOL SYNC itself is used as the (symbol) clock, the CMOS falling edge is used to
clock the DATA signal.
On signal generators without Option 1EM, this connector is located on the front panel.
41. Q IN
This female BNC input connector (E8267D only) accepts the quadrature–phase (Q) component an
externally supplied, analog, I/Q modulation. The in–phase (I) component is supplied through the I IN
connector. The signal level is = 0.5 V
rms
for a calibrated output level. The nominal input
impedance is 50 or 600 ohms. The damage level is 1 V
rms
and 10 V
peak
. To activate signals applied to
the I and Q input connectors, press Mux > I/Q Source 1 or I/Q Source 2 and then select either Ext 50 Ohm or
Ext 600 Ohm
. On signal generators without Option 1EM, this connector is located on the front panel.
42. DATA
This female BNC input connector (Option 601/602 only) is CMOS compatible and accepts an
externally supplied serial data input for digital modulation applications. The expected input is a 3.3 V
CMOS signal (which is also TTL compatible) where a CMOS high = a data 1 and a CMOS low = a data
0. The maximum input data rate is 50 Mb/s. The data must be valid on the falling edges of the data
clock (normal mode) or on the falling edges of the symbol synchronization (symbol mode). The
damage levels are > +5.5 and <
−
0.5V. The nominal input impedance is not defined. On signal
generators without Option 1EM, this connector is located on the front panel.
43. LF OUT
This female BNC output connector (functional only with Option UNT) outputs modulation signals
generated by the low frequency (LF) source function generator. This output is capable of driving
3V
p
(nominal) into a 50–ohm load. On signal generators without Option 1EM, this connector is
located on the front panel.