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

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ADRV9001 IN TETRA TYPE PORTABLE RADIO APPLICATION

ANTENNA
RF SWITCH
COUPLER
ATTENUATOR
RF I/O FUNCTIONALITY
Rx1A RF RECEPTION
Rx1B USED BY Tx DPD AND CALIBRATIONS
Tx1 RF TRANSMISSION
TETRA Type Portable Radio Overview
ADRV9001 transceiver with minimum number of external components can be utilized to build complete RF-to-bits signal chain that can
serve as RF front end in TETRA type applications. Internal DPD block can be utilized to linearize external power amplifier and improve
overall system efficiency. For systems that demand superior LO phase noise performance ADRV9001 allows user to apply eternal RF LO.
ADRV9001 internal AGC can be utilized to autonomously monitor and set appropriate gain level for Rx signal chain. For time critical
TDD type applications control of the ADRV9001 TRx can be done by toggling control lines. ADRV9001 can control external Rx/Tx
switch using its analog GPIOs as well as provide power amplifier bias voltage by utilizing AuxDAC outputs.
Table 5. Constrains and Limitations in TETRA Type Portable Radio Application
Functionality Constrains and Limitations
LO Generation In Portable Radio, TETRA type application, ADRV9001 can use its internal LO to generate RF LO1 for both uplink and
downlink. For applications with stringent RF LO requirements, user can use external LO inputs. External LO1 operating
at 2x RF LO can be used for both uplink and downlink.
RF Front End For LO generation, ADRV9001 utilize internal VCO that generates square wave type signal. A square wave LO would
produce harmonics. For example: depending of RF matching used on the RF ports user 2nd LO harmonic can be as
high as -50dBc and 3rd harmonic can be as high as -9 dBc. Therefore the RF filtering on the Rx and Tx path must
ensure that signals at the LO harmonic frequencies (up to 9th in some cases) are not affecting overall system
performance.
PA
VGA
LPF
TEMPERATURE
SENSOR
BPF FILTER
LNA
EXTERNAL
LO SOURCE
Figure 7. ADRV9001 in TETRA Type Portable Radio Application
Rev. PrA | Page 18 of 253
Preliminary Technical Data
POWER IC
ADRV9001
BALUN Tx1
INT
DAC QEC
LOL
DPD
BALUN
Rx1A
DDC
DEC
ADC
QEC
BALUN
DC
Rx1B
BALUN
EXT LO1
Rx/Tx_ENABLE
/2
RF PLL1
BALUN EXT LO2
/2
RF PLL2
DEV_CLKL_OUT
AGPIOs AuxADC AuxDAC
Tx1
DATA
3/4/6/7/8/10
SSI
Rx1
DATA
3/6/8
SSI
FPGA
OR
14/16
BBIC
DGPIOs
2
GP_INT
3/4
SPI
RESET
MCS
BALUN
VCXO
DEV_CLK