Adrv9001 In An Fdd Type Repeater Application Using Internal Loopbacks - Analog Devices ADRV9005 Reference Manual

Reference Manual
ADRV9001 EXAMPLE USE CASES

ADRV9001 IN AN FDD TYPE REPEATER APPLICATION USING INTERNAL LOOPBACKS

Figure 10. ADRV9001 in an FDD Type Repeater Application Without Baseband Processor Analyzing Traffic Data
FDD Type Repeater Using Internal Loopbacks
With a minimum number of external components, the ADRV9001 transceiver can be used to build a complete RF-to-RF signal chain that can
serve as a repeater or a frequency translator. The ADRV9001 internal AGC can be used to autonomously monitor and set the appropriate
gain level for the receiver signal chains. For none-time critical FDD type applications, the ADRV9001 transceiver can be controlled through API
commands that use the serial-peripheral interface (SPI). The support of external crystal enables a very compact solution, where the ADRV9001
provides clock for a microprocessor that programs and monitors the ADRV9001 operation.
Table 9. Constraints and Limitations in an FDD Type Repeater Application Without Baseband Processor Analyzing Traffic Data
Functionality Constraints and Limitations
Receiver Signal Path Ensure an appropriate level of isolation between Rx1 and Rx2 as well as receiver to transmitter at the system level. In the example, RxB inputs
are used only during initialization calibrations.
Transmitter Signal Path Ensure an appropriate level of isolation between Tx1 and Tx2 as well as receiver to transmitter at the system level.
LO Generation In the FDD type repeater application, the ADRV9001 can use its internal LO to generate RF LO1 for uplink (example, Tx1, and Rx2) and RF LO2
for downlink (example, Tx2, and Rx1). It is also possible to use external LO inputs in this mode of operation.
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