Radios are a challenge at any level but with 5G comes much wider bands, higher frequencies, higher total radiated power, and the number of antennas increases exponentially. Optimizing the performance of these devices while reducing size, weight, and overall power requirements is a big task. In an interview with EEWeb, Nitin Sharma, General Manager, Wireless Communications in Analog Devices (ADI) business unit, explained the company’s latest wireless platform for its 5G O-RAN ecosystem, designed to shorten market time and meet the evolving needs of 5G networks. “O-RAN presents a unique set of challenges on the road to success,” Sharma said. “There is interdependence among the participants in the ecosystem that differs from the old market structure. It is not sufficient for a single resource to guarantee the successful implementation of“ only part of it. ”Instead, they must consider the risks of collective innovation and the chain of adoption, and work to reduce or eliminate them. Successful deployment on close collaboration and openness across ecosystem players. At ADI, we work across the ecosystem from system integrators to PA suppliers to ensure comprehensive interoperability and optimum efficiency. Working together to improve overall system performance helps our customers create impressive O-RUs quickly. ” . The radio platform of the 5G ADI wireless platform includes all the basic functions required in a 5G radio module compatible with O-RAN, including ASIC baseband, software-defined transceivers, signal processing and power. This advanced radio platform is designed to enable significant performance and form factor improvements to address the critical energy consumption and cost challenges of next-generation networks while reducing customer design cycles. 5G brings a new twist to the mix with an increased likelihood of aliases or signal overlapping in the C-band, for example. “If you remember the criteria for Nyquist signal sampling, the Nyquist regions divide the spectrum into uniformly spaced regions at Fs / 2 intervals. Each Nyquist region contains a copy of the desired signal spectrum or an inverted image of it. According to the theory, the signals are below the sample rate. And above it, in an equal amount, they appear on top of each other at the output of the ADC, ”Sharma said. “Here’s why this matters now: The common receiver architecture found in base station radios relies on sampling an analog-to-digital converter (ADC) between ~ 3GHz and 4GHz (2949.12MHz is a suitable rate used). As it turns out, frequencies overlap The C-band and some of the FDD bands are most commonly used in conjunction with one another when using ADC-based devices. This is a difficult (ie expensive) problem to solve. ADI uses a radio architecture that avoids this problem and greatly simplifies the necessary filtering. ” O-RAN Engineering. (Source: https://www.o-ran.org/) Due to the high performance requirements of 5G, Sharma noted that all components become important in these radio units. “Often times, a software-defined transceiver defines a system’s baseline, but power, synchronization, clock, PA, antenna, and lower PHY base range contribute to the overall performance. With this 8T8R radio platform we are improving all metrics for SWaP + C results (size Weight, power + cost) for the O-RAN Compliant O-RU. ADI works closely with PA Partners to collaboratively improve the linearity and efficiency of the devices. We also deal with system integrators and test equipment developers to improve low PHY interoperability. Combine that with ADI’s portfolio of high-performance, efficient silicon solutions, and it’s a true example of an O-RAN ecosystem that works together. ”The ADI reference platform will enable designers to create O-RAN compatible radios using: ADI’s next-generation transceiver Which features advanced digital signal processing (DFE), digital pre-distortion with GaN PA support, peak factor reduction, digital channel up switches and digital channel switches.Low PHY baseband provides a 7.2x compatible solution for LTE, 5G and NBIoT networks, including That’s IEEE1588 Time-of-Resolution Protocol and eCPRI. Complete clock and power chain solutions. ”Across multiple generations, ADI’s wireless technology roadmap has expanded the performance and capabilities of market-leading, software-defined transmitters and receivers. First, we merged or removed important parts of the signal chain. Building on this architecture in successive generations, we have expanded the number of channels, increased bandwidth, and added important digital functions, all to reduce size, weight and power consumption. ” he added. .