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Feature sponsored by Calibration


BEAMEX EXTENDS ITS GLOBAL REACH WITH OPENING OF CHINESE SUBSIDIARY


Figure 3. Transmitter output phase comparison through RF PLL phase synchronisation cycle (RF tune frequency = 1800 MHz).


the required beamforming performance. There are four modes of operation for controlling the phase sync feature:


Mode 1: Disable the on-chip RF PLL sync feature.


Mode 2: Enable RF PLL sync only for initialisation.


Mode 3: Perform RF PLL sync upon initialisation and track only once.


Mode 4: Continuous RF PLL phase tracking.


Figure 3 presents the results of measured phase difference upon multiple power-up cycles in a multichip and multichannel environment. The measurement setup has four RF channels developed using two identical evaluation boards, one of which is the ADRV9009- W/PCBZ. With the help of a vector network analyser, the change has been measured in the phase difference between the transmitter output


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Instrumentation Monthly March 2023


signals upon every power-up cycle. Please refer to the user guide for further details. The measurements are taken for five power- up cycles and compared in different modes of operation. The system started without enabling the RF PLL synchronisation feature. It can be seen that, with each power-up cycle, there is a random phase relation. After enabling the RF PLL synchronisation feature, all five relative phase values converge to a repeatable value within a tolerance of ±2°. When continuous tracking is enabled, it maintains the relative phase value with some delay. This delay results in a 1° to 2° increase in the relative phase. Hence, a little shift could be observed in the figure. With this feature, stable phase value can be achieved within a deterministic tolerance. This reduces the impact of dynamic factors and simplifies the overall synchronisation and calibration of the system.


CONCLUSION


The RF PLL synchronisation feature is available in advanced generations of highly integrated SDRs provided by ADI, including the ADRV9009 dual-channel transceiver. If large antenna array systems are built using this device, the RF PLL synchronisation feature could be exploited to simplify the antenna calibrations. Different modes of operations are available that can be selected according to the application requirement. Control and configuration of the feature is executed simply by using software API functions. The ADRV9009 user guide provides further details on the function and usage of this feature.


Analog Devices www.analog.com


eamex has established a wholly foreign owned enterprise in China. The subsidiary represents an important milestone in terms of Beamex’s progress in Asia and reaffirms its position as a leading global player in the calibration industry. Asia is a key growth region for Beamex, and China in particular shows excellent potential as a market for innovative solutions targeted at process industry customers. With the establishment of a Chinese subsidiary, Beamex customers in the country will have better access to the latest calibration hardware, software, and services with the added advantage of local aftersales support in their own language.


B


The subsidiary is headquartered in Shanghai and comprise sales, marketing, and technical support functions. Beamex is confident that a direct presence in China will help foster closer relationships with, and lead to a wide range of benefits for, its customers in this strategically important market. Commenting on the announcement, Roberto Guaranha, general manager, Beamex China, says: “With the establishment of a Chinese subsidiary we can deliver on our aim to be a trusted advisor for continuous process improvement and sustainable, safe operations for our customers in the country. The subsidiary will bring us even closer to our Chinese customers and make it easier for them to do business with us, supporting our aim to deliver outstanding services and a seamless digital calibration experience for all local stakeholders.”


Beamex beamex.com 67


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