Adrv9001 In A Tetra Type Portable Radio Application - Analog Devices ADRV9001 User Manual

Reference Manual
ADRV9001 EXAMPLE USE CASES

ADRV9001 IN A TETRA TYPE PORTABLE RADIO APPLICATION

TETRA Type Portable Radio Overview
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 TETRA type applications. Internal DPD block can be used to linearize the external power amplifier and improve
overall system efficiency. For systems that demand superior LO phase noise performance, the ADRV9001 allows users to apply external RF
LO. The ADRV9001 internal AGC can be used to autonomously monitor and set appropriate gain level for the receiver signal chain. For
time-critical TDD type applications, the ADRV9001 transceiver can be controlled by toggling control lines. The ADRV9001 can control external
receiver/transmitter switch using its analog GPIOs as well as provide power amplifier bias voltage using AuxDAC outputs.
Table 5. Constraints and Limitations in a TETRA Type Portable Radio Application
Functionality Constraints and Limitations
LO Generation In a portable radio, TETRA type application, the ADRV9001 can use its internal LO to generate RF LO1 for both uplink and downlink. For
applications with stringent RF LO requirements, use external LO inputs.
RF Front End For LO generation, the ADRV9001 uses internal VCO that generates a square wave type signal. A square wave LO produce 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
as high as −9 dBc. Therefore, the RF filtering on the receiver and transmitter path must ensure that signals at the LO harmonic frequencies (up to
ninth in some cases) do not affect overall system performance.
DPD The DPD functionality can be used in the 1T1R TDD mode. The DPD operation can be performed by the ADRV9001 or receiver data can be
sent to the baseband processor through receiver data port during transmitter operation. The receiver path used during DPD operation to perform
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Figure 7. ADRV9001 in a TETRA Type Portable Radio Application
ADRV9001
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