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MaxLinear Launches Single Chip for 5G Open RAN Radio Units

  • New System-on-Chip (SoC) silicon platform accelerates the development of Open RAN radios with lower size, weight, power, cost, and cooling.
  • Solution includes digital pre-distortion (DPD) for PAs, PIM cancellation, split 7.2X support, and Ethernet or JESD interface support.
  • MaxLinear Sierra feature capabilities will be demonstrated at MWC 2024 in Barcelona.

MaxLinear, Inc. (Nasdaq: MXL), a leader in wireless infrastructure silicon solutions, today announced it has launched the MXL17xxx family of devices (“Sierra”), a highly integrated SoC optimized for 4G/5G Open Radio Access Network (RAN) radio units (RU). Sierra is an innovative single-chip platform that flexibly supports major RU applications including traditional macro, massive MIMO, picocell, all-in-one small cells, and more.

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MaxLinear Launches Single Chip for 5G Open RAN Radio Units (Graphic: Business Wire)

MaxLinear Launches Single Chip for 5G Open RAN Radio Units (Graphic: Business Wire)

Sierra integrates the following sub-systems into a single chip, providing a complete software-programmable radio signal processing engine for Open RUs (O-RU):

  • RF transceiver supporting up to 8 transmitters, 8 receivers, and 2 feedback receivers
  • Digital Front End (DFE) including DPD, crest factor reduction (CFR), and Passive Intermodulation (PIM) cancellation
  • Low-PHY baseband processor supporting 5G, 4G, and NB-IoT air interfaces
  • O-RAN Alliance Split 7.2x fronthaul interface

“Infrastructure vendors have been waiting for an open-market silicon solution that can enable them to develop O-RUs without compromise on performance or cost,” said Sean Martin, Senior Director of Wireless Infrastructure. “By integrating our highest performance RF and system technologies in Sierra, MaxLinear is empowering these radio vendors to rapidly and cost effectively develop new O-RUs with reduced size, weight, and power consumption.”

Sierra’s complete system integration yields a feature-rich, high-performance RU building block with low power consumption, board footprint, and implementation cost that reduces the need for multiple FPGAs/ASICs and massively simplifies new O-RU development. Designers can rapidly build new macro and picocell O-RUs using just a single Sierra device by adding an appropriate RF front end. Massive MIMO O-RU are created by tiling an array of Sierra devices and connecting them to a central beamforming solution. This system modularity and flexibility makes Sierra an ideal radio platform building block to maximize design reuse and dramatically speed up the development of new O-RUs.

“Open RAN momentum continues to build and is set to account for 20 percent to 30 percent of worldwide RAN revenues by 2028,” said Stefan Pongratz, Vice President and Analyst at the Dell’Oro Group. “New optimized off-the-shelf O-RU silicon solutions like Sierra play an essential role to enable improved radio supplier diversity.”

At the heart of Sierra is MaxLIN™, MaxLinear’s leading field-proven DPD solution for wideband power amplifier linearization, supporting up to 400MHz of occupied bandwidth. MaxLIN’s linearization performance exceeds the 3rd Generation Partnership Project (3GPP) and U.S. Federal Communications Commission (FCC) unwanted emissions requirements with margin while delivering high PA efficiency, thereby minimizing RU energy consumption, and making radios lighter and more cost-effective. MaxLIN’s advanced algorithms feature enhancements to correct for both long-term and short-term nonlinear dynamics including GaN charge trapping and thermal transients, critical for high-power Macro applications. It optimally supports different power amplifier (PA) architectures, technologies, and power levels for all potential RU applications from macro to picocells. In addition, OEMs also have the option to implement their own DPD using the Sierra on-chip compute resources.

More about Sierra

Sierra’s RF transceiver uses a low power wide band Zero-IF (ZIF) architecture and supports 8 transmitters (TX) and 8 receivers (RX) with 2 feedback receivers (FBRX). Each RX supports wide signal bandwidths up to 400MHz and each TX and FBRX supports signal bandwidths up to 900MHz. It can operate in 8T8R single-band or 2 x 4T4R multi-band configurations.

The digital front-end (DFE) integrates digital pre-distortion (DPD), crest factor reduction (CFR), passive intermodulation cancellation (PIMC), digital up conversion (DUC), and digital down conversion (DDC) blocks. MaxLinear's advanced DPD/CFR technology, MaxLIN™, linearizes power amplifiers (PA) up to 400MHz of occupied bandwidth and dramatically improves PA energy efficiency while meeting spectral emission masks with margin. The PIMC block cancels passive intermodulation products in the uplink paths to improve receiver sensitivity and relax the specification of expensive RF filters. The DUC/DDC supports up to eight component carriers per transmit and receive path.

The Low-PHY baseband processor supports 4G, 5G, and NB-IoT air interfaces, including uplink PRACH processing. It can process up to eight component carriers (CC) per transmit and receive path with subcarrier spacing (SCS) of 15kHz, 30kHz, and 60kHz and it is software configurable for different modes and parameters including dynamic spectrum sharing (DSS), bandwidth parts, mixed numerology, and windowing.

Sierra supports an O-RAN fronthaul Split Option 7.2x Category A interface with up to four 10 or 25 Gbit/s Ethernet interfaces.

Sierra integrates an embedded CPU for system control. The CPU is an integrated quad-core Arm® A53 processor with Neon™ extensions. Each Arm® core has 1MB of internal SRAM and has access to an additional 8GB of external DRAM through a DDR controller.

Sierra Availability:

Sierra is available in a 31mm x 31mm Flip-Chip Ball Grid Array (FCBGA) package. Sierra is sampling to first customers in March 2024. Sierra samples are supported by an evaluation platform, software, and tools to facilitate early system development.

MaxLinear will be conducting briefings on MaxLinear’s radio solutions at Mobile World Congress – Hall 2, meeting rooms 2A54MR and 2A63MR – from February 26 through February 29, 2024.

About MaxLinear, Inc.

MaxLinear, Inc. (Nasdaq: MXL) is a leading provider of radio frequency (RF), analog, digital, and mixed-signal integrated circuits for access and connectivity, wired and wireless infrastructure, and industrial and multimarket applications. MaxLinear is headquartered in Carlsbad, California. For more information, please visit

MaxLinear, the MaxLinear logo, any other MaxLinear trademarks are all property of MaxLinear, Inc. or one of MaxLinear's subsidiaries in the U.S.A. and other countries. All rights reserved.

All third-party marks and logos are trademarks or registered trademarks of their respective holders/owners.

Cautionary Note About Forward-Looking Statements

This press release contains “forward-looking” statements within the meaning of federal securities laws. Forward-looking statements include, among others, statements concerning or implying future financial performance, anticipated product performance and functionality of our products or products incorporating our products, and industry trends and growth opportunities affecting MaxLinear, in particular statements relating Sierra, including but not limited to, with respect to its benefits of use, features, demand and anticipated growth in the RAN market. These forward-looking statements involve known and unknown risks, uncertainties, and other factors that may cause actual results to differ materially from any future results expressed or implied by these forward-looking statements. We cannot predict whether or to what extent these new and existing products will affect our future revenues or financial performance. Forward-looking statements are based on management’s current, preliminary expectations and are subject to various risks and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements. Forward-looking statements may contain words such as “will be,” “will,” “expected,” “anticipate,” “continue,” or similar expressions and include the assumptions that underlie such statements. The following factors, among others, could cause actual results to differ materially from those described in the forward-looking statements: risks relating to the development, testing, and commercial introduction of new products and product functionalities; risks relating to our terminated merger with Silicon Motion and related arbitration and class action complaint and the risks related to potential payment of damages; the effect of intense and increasing competition; impacts of global economic conditions; the cyclical nature of the semiconductor industry; a significant variance in our operating results and impact on volatility in our stock price, and our ability to sustain our current level of revenue, which has declined, and/or manage future growth effectively, and the impact of excess inventory in the channel on our customers’ expected demand for certain of our products; the geopolitical and economic tensions among the countries in which we conduct business; increased tariffs, export controls or imposition of other trade barriers; our ability to obtain or retain government authorization to export certain of our products or technology; risks related to the loss of, or a significant reduction in orders from major customers; costs of legal proceedings; information technology failures; a decrease in the average selling prices of our products; failure to penetrate new applications and markets; development delays and consolidation trends in our industry; inability to make substantial research and development investments; delays or expenses caused by undetected defects or bugs in our products; failure to timely develop and introduce new or enhanced products; order and shipment uncertainties; failure to accurately predict our future revenue and appropriately budget expenses; lengthy and expensive customer qualification processes; customer product plan cancellations; failure to maintain compliance with government regulations; failure to attract and retain qualified personnel; any adverse impact of rising interest rates on us, our customers, and our distributors and related demand; risks related to compliance with privacy, data protection and cybersecurity laws and regulations; risks related to conforming our products to industry standards; risks related to business acquisitions and investments; claims of intellectual property infringement; our ability to protect our intellectual property; risks related to security vulnerabilities of our products; use of open source software in our products; and failure to manage our relationships with, or negative impacts from, third parties. In addition to these risks and uncertainties, investors should review the risks and uncertainties contained in MaxLinear’s filings with the United States Securities and Exchange Commission, including risks and uncertainties arising from other factors affecting the business, operating results, and financial condition of MaxLinear, including those set forth in MaxLinear’s most recent Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, and Current Reports on Form 8-K, as applicable. All forward-looking statements are qualified in their entirety by this cautionary statement. MaxLinear is providing this information as of the date of this release and does not undertake any obligation to update any forward-looking statements contained in this release as a result of new information, future events, or otherwise.

Market Information

This press release contains statistical data, estimates and forecasts that are based on independent industry publications or other publicly available information. This information involves many assumptions and limitations, and you are cautioned not to give undue weight to such information. We have not independently verified the accuracy or completeness of the information contained in the industry publications and other publicly available information. Accordingly, we make no representations as to the accuracy or completeness of that information nor do we undertake to update such information after the date of this press release.


MaxLinear, Inc. Press Contact:

Matthew Lea

Head of Public Relations

Tel: +1 760.415.2529

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