Key Features
Agilent E4438C Vector Signal Generator
The Agilent E4438C Vector Signal Generator provides unparalleled flexibility for generating both analog and digital signals
used in modern communications. Be it an open standard or proprietary protocol, the E4438C is equipped with the capability
to generate all these signals. Even for non-standard signals, or signals to be experimented, the E4438C provides the ease to
supplement all test systems with the correct and desired signal protocol.
With the limit of a 64MB internal baseband generator memory, the E4438C
can hold various simple I/Q files to enable quick verification of the DUTs.
However, for more complex signals requiring a much larger I/Q file, the
Agilent N5101A Baseband Studio card would allow I/Q files to be stored on
the controller and streamed directly into the E4438C.
This effectively increases the space availability for an I/Q file tremendously.
With the constant increase of hard disk storage capacity, coupled with RAID
configurations, this setup provides a powerful setup for signal generation.
Just customize your desired signal onto an I/Q file, then playback using a single instrument to maximise the utilization of
that instrument.
Navigation Systems (GPS)
Single Satellite. A single satellite signal can be generated using the I/Q file playback capability of the E4438C. Whether
it’s a signal to detect just the satellite or to
include navigational data, the flexible I/Q file
playback feature allows your test engineers
to predefine the data for signal generation.
Figure 3 explains the process of GPS single
satellite file creation using I/Q playback.
Multi-Satellite. Multi satellite simulation
enables a more complete solution to test a
GPS receiver functionality. For triangulation,
GPS receivers commonly need 4 separate
satellite signals. At any given time, a
constellation of 12 satellites could be
detected by a GPS receiver. The Agilent
E5101A Baseband Studio card and PC
controller are included to simulate up to 12
satellite signals.
The type of data required can be pre-defined.
AM/FM/RDS (Radio Data System) Simulation
A simple and straightforward simulation is performed initially with a common audio signal for both AM/ FM signals (see
Figure 4). The audio signal is then channeled to an RDS-enabled signal generator, coding the audio signal and modulating it
into an RF signal which is then transmitted together with the RDS data.
The transmitted signal is then demodulated by the DUT, played back and the output channeled to the audio loads for
analysis by the audio analyzer. The original audio signal is used as a reference by the audio analyzer, which is compared to
the output of the audio loads.
4
Figure 3: GPS Single Satellite Block Diagram
Figure 2: Agilent E4438C Vector Signal Generator
(204 paginas)
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