Agilent Technologies E4400-60230 g Manuale Utente Pagina 420

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6-4 Real-Time I/Q Baseband Generator User’s and Programming Guide
Theory of Operation ESG Family Signal Generators
Alternate Amplitude and Alternate Timeslot Amplitude Control (Option UNA only) Options UN8 and 202
Alternate Amplitude and Alternate Timeslot Amplitude
Control (Option UNA only)
The Alternate Amplitude Control feature comprises two separate subsystems, Alternate
Amplitude and Alternate Timeslot Amplitude. The Alternate Amplitude Control
subsystem provides the user with the capability of toggling the RF output power between a
main amplitude and a definable alternate amplitude. The Alternate Timeslot Amplitude
subsystem provides the capability of having different power levels on the transmitting
digital data stream during framed data or non-framed external data.
Analog instruments with the Alternate Amplitude Control Option UNA are equipped with
only the Alternate Amplitude subsystem. Digital instruments with baseband generators
(Option UN8) have both Alternate Amplitude and Alternate Timeslot Amplitude
subsystems.
NOTE The two subsystems can operate independently or coupled depended on the
configuration. Similar to data generation and I/Q Burst control, the firmware
provides the most intuitive approach to signal coupling, but when necessary,
the user can override all firmware couplings.
Table 6-2. Summary of Firmware Couplings
Mode
State
Pattern/Framed
Data
Alt
State
Alt
Trigger
RF Output General
Comments
OFF N/A ON EXT Main and Delta
Toggling
Must supply trigger input
to TRIGGER IN rear panel
BNC
OFF N/A ON MAN Main and Delta
Toggling
Use softkey or remote
command to toggle the RF
OFF N/A ON INT Main Only INT trigger source has no
effect when MODE off
ON Int Pattern OFF N/A Main or Delta
(Manual
Control)
Can manually turn on ALT
and manually toggle RF
ON Ext Pattern ON INT Main and Delta
toggling
Must supply trigger input
to ALT PWR IN
rear panel BNC
ON Frame
(all timeslots OFF)
OFF N/A No RF Alternate amplitude has no
meaningwhen all timeslots
are off
ON Frame
(at least one
timeslot on with
no delta selection)
OFF N/A Main power
during on
timeslot
Alternate amplitude is off
to avoid power drift when
none of the timeslots are
using Delta Amplitude.
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