32 Chapter 2
E4438C Vector Signal Generator Overview
Front Panel Overview
31. DATA Connector (Option 001/601 or 002/602)
The female BNC input connector accepts a CMOS externally supplied CMOS compatible signal data input
used with digital modulation applications. The expected input is a CMOS signal where a CMOS high is
equivalent to a data 1 and a CMOS low is equivalent to a data 0.
The maximum input data rate is 50 Mb/s.The data must be valid on the DATA CLOCK falling edges. The
damage levels are > +5.5 volts and < − 0.5 volts.
On signal generators with Option 1EM, this input is relocated to a rear panel SMB connector.
32. Q Connector
This female BNC input connector accepts an externally supplied, analog, quadrature-phase component of
I/Q modulation. The signal level is = 0.5 V
rms
for a calibrated output level. The input impedance is
50Ω. The damage level is 1 V
rms
and 10 volts peak.
To activate a signal applied to this connector, 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 with Option 1EM, this input is relocated as an SMB to the
rear panel.
33. I Connector
This female BNC input connector accepts an externally supplied, analog, in-phase component of I/Q
modulation. The signal level is = 0.5 V
rms
for a calibrated output level. The input impedance is 50Ω.
To activate the in-phase component of the I/Q signal applied to this connector, press
Mux > I/Q Source 1 or
I/Q Source 2 and then select either Ext 50 Ohm or Ext 600 Ohm.
This input connector also accepts the modulating signal for use with the wideband AM selection. The
wideband AM signal depth is a linear function of the I INPUT signal voltage:
• 0.25 volts = 50%
• 0.5 volts = 100%
When turned on, wideband AM automatically selects the I INPUT and configures it for 50Ω. This setting is
independent of the
MUX > I/Q Source setting.
The damage level for this connector is 1 V
rms
and 10 volts peak. On signal generators with Option 1EM, this
input is relocated as an SMB to the rear panel.
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