5G is undoubtedly an important point of shaping the communications industry, except for the huge mobile market, infrastructure base station and other markets will also usher in an outbreak. According to DG Times, the overall market size of 5G communication base station in 2020 is 1143 million US dollars, and by 2026 to $ 34.286 billion, composite growth rate is 50%. Technical development, with the evolution of communication standards and carrier aggregation, MIMO, etc. The corners of the bus stop card, providing communication capabilities for regions that are dense, large base station unable to contact, and further form a large-scale MIMO system.
What is the difficult to build a large-scale MIMO?
The MIMO transceiver architecture is widely used in the design of high power RF wireless communication systems. As a step into a 5G era, a large-scale MIMO system covered in the cellular frequency band is currently deploying in urban areas to meet the emerging needs of users for high data throughput and a range of new business. Therefore, how to build a large-scale MIMO system, what is the difficulty of solving it?
At the 2018 China ICT Entrepreneur Conference, the author of the 2018 China ICT Entrepreneur will be known in the conversation with the Adi Communication Technical Experts, and the highly integrated single-chip radio frequency transceiver solution can quickly build a large-scale MIMO system. ADI expert said: "The RF front end portion of this type of system still needs similar integration, intended to reduce power consumption (to improve thermal management) and reduce size (to reduce cost), thereby accommodating more MIMO channel .adi The latest RadioversTM ADRV9008 / ADIOVERSETM ADRV9008 / ADRV9009 transceiver series, providing two times the bandwidth (200 MHz) of the previous generation, can replace up to 20 devices, the power consumption is half, the package size is reduced by 60%, can be designer Provide a single radio platform to accelerate 5G deployment. "
At the same time, the MIMO architecture allows the relaxation of RF power requirements for build modules such as amplifiers and switches. However, as the number of parallel transceiver channels increases, the complexity and power consumption of peripheral circuits also increase accordingly. The technical expert said that Adi uses a new high-power switch for silicon technology to simplify the RF front-end design, exempt the need for peripheral circuits and reduce power consumption to negligible levels. Adi's new high-power switch for silicon technology provides RF designers and system architects to improve their system complexity, and will not let RF front ends become its design bottlenecks.
High power silicon switch application example
In practical applications, in a duplex (TDD) system, the antenna interface is incorporated into the switching function, isolating and protecting the receiver input from the influence of transmitting signal power. Adi experts say that the switch function can be used directly on an antenna interface (in a relatively low power, as shown in Figure 2), or in the received path (for higher power applications, as shown in Figure 3) To ensure proper connection to the duplexer. There is a parallel branch on the switch output will help improve isolation performance.
Antenna switch
LNA protection switch
Switt-based switches with low insertion loss and high power processing capabilities have always been the preferred solution. However, in the design of a large-scale MIMO system, they require high bias voltages to apply reverse bias (for isolation) and high current to apply a forward bias (for realizing low insertion loss), this change It has become a disadvantage. The figure below shows a typical application circuit for switching and peripherals based on a PIN diode. Three discrete PIN diodes are biased by their bias power supply circuits and controlled by a high voltage interface circuit.
PIN diode switch
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