Adrv9001 In An Fdd Type Repeater Application - Analog Devices ADRV9001 User Manual

Reference Manual
ADRV9001 EXAMPLE USE CASES

ADRV9001 IN AN FDD TYPE REPEATER APPLICATION

Figure 9. ADRV9001 in an FDD Type Repeater Application with Baseband Processor Analyzing Traffic Data
ADRV9001 in an FDD Type Repeater Application with Baseband Processor
With a minimum number of external components, the ADRV9001 transceiver can be used to build a complete RF-to-bits signal chain that can
serve as RF front end in repeater or frequency translator type applications. 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).
Table 7. Constraints and Limitations in an FDD Type Repeater Application with 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.
RF Front End For LO generation, the ADRV9001 uses internal VCO that generates a square wave type signal. A square wave LO produces harmonics. For
example, depending on RF matching used on the RF ports, the second LO harmonic can be as high as −50 dBc, and the third harmonic can be
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