I Out; Wideband I Inputs; I-Bar Out - Keysight E8267D User Manual

Signal Generator Overview
Rear Panel
this female BNC connector is used to output the quadrature–phase component
of an external I/Q modulation that has been fed into the Q input connector. The
nominal output impedance of the Q OUT connector is 50 ohms, dc–coupled.

8. I OUT

This female BNC connector (E8267D only) is used with an internal baseband
generator (Option 601/602) to output the analog, in–phase component of I/Q
modulation. On signal generators without Option 601/602, this female BNC
connector is used to output the in–phase component of an external I/Q
modulation that has been fed into the I input connector. The nominal output
impedance of the I OUT connector is 50 ohms, dc–coupled.

9. WIDEBAND I INPUTS

These female SMA connectors: I IN (+) and I–bar IN (−) (Option 016 only) are
used with differential wideband external I/Q inputs. They accept wideband AM
and allow direct high–bandwidth analog inputs to the I/Q modulator in the
3.2-44 GHz range (frequency limit is dependant on the option). This input is
not calibrated. The recommended input power level is −1 dBm with a +/− 1
VDC input voltage. The nominal impedance for this connector is 50 ohms.
The signal generator uses lowside mixing in the 20–28.5 GHz frequency range
(Options 532 and 544), which reverses the phase relationship for I and Q
signals. For internally generated I/Q signals the signal generator's firmware
compensates for this. However, for wideband external I/Q inputs (Option 016)
there is no compensation and the I and Q inputs at the rear panel must be
reversed to maintain the correct phase relationships in this frequency band.
Refer to the Data Sheet and to the A37 Upconverter description in the
Keysight PSG Signal Generators Service Guide for more information.
For instruments with Option 015 (discontinued), single–ended wideband I/Q,
there is a single BNC I input. The recommended power level at this input
connector is 0 dBM.
10. I–bar OUT
This female BNC connector (E8267D only) is used with an internal baseband
generator (Option 601/602) to output the complement of the analog, in–phase
component of I/Q modulation. On signal generators without Option 601/602,
this female BNC connector is used to output the complement of the in–phase
component of an external I/Q modulation that has been fed into the I input
connector.
I–bar OUT is used in conjunction with I OUT 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 the I–bar OUT connector is 50
ohms, dc–coupled.
Keysight E8357D/67D & E8663D PSG User's Guide 33