37
www.agilent.com/find/esg
The Bluetooth receiver demodulates the signal transmitted by the ESG and provides
access to the Bluetooth baseband signal (packets or continuous data stream) at the
baseband processor output. This signal is routed to the ESG internal BER analyzer data
input.
If recovered clock and gate signals are also available from the Bluetooth device’s base-
band processor, these signals should be used to perform the BER analysis. Using these
signals provides a more functional test of receiver clock recovery capability. Furthermore,
these signals have experienced the same propagation delay as the demodulated Bluetooth
signal. Hence, they do not need to be realigned at the input of the BER analyzer.
If the Bluetooth device does not provide the clock or gate signal, the clock and gate
signals generated by the ESG can be used to perform the BER analysis. The delay setting
found using the Signal Studio clock/gate delay calibration feature should be used to
realign the clock/gate signals generated by the ESG with the demodulated Bluetooth
signal at the input of the BER analyzer.
“Loopback” operating mode
The ESG is not capable of demodulating a Bluetooth RF signal. Therefore, to perform
BER analysis on a Bluetooth device operating in a “loopback” test mode, additional
equipment is required to demodulate the Bluetooth RF loopback signal. In the test setup
shown in Figure 41, the ESG vector signal generator and ESA-E Series spectrum analyzer
combine to provide a powerful BER test solution for Bluetooth devices operating in
“loopback” mode.
Figure 41. BER test setup for a Bluetooth device operating in “loopback” mode.
Basic Measurements
E4438C ESG vector signal generator
• Option 503 250 kHz to 3 GHz frequency range
• Option 602 Baseband generator with 64 MSa
• Option 406 Signal Studio for Bluetooth
• Option UN7 Internal BER analyzer
BER
gate in
Event 2BER
clock in
Event 1
RF out
Bluetooth radio
Rear panel
R
x
T
x
BER
data in
ESA-A Series spectrum analyzer
• Option 304 Bluetooth measurement personality
RF in
External
video out
To Next Page
Loading...
Need help?
General
