Skyworks Solutions an innovator of high-performance analog semiconductors connecting people, places and things, together with Xilinx recently demonstrated compliance with 3GPP linearity and bandwidth requirements for C-band signals that are critical for enabling next-generation 5G infrastructure. The 280 MHz instantaneous bandwidth (IBW) solution that was demonstrated by the companies uses a Xilinx Zynq RFSoC Gen 3 and a Skyworks SKY66523-11 high-efficiency power amplifier (PA).
The SKY66523-11 wide instantaneous bandwidth high-efficiency PA has an operational frequency range of 3550 to 4200 MHz and is ideal for use as both a C-band 5G NR small cell PA and as a driver amplifier for Massive MIMO and macro base stations. The US C-band spectrum refers to mid-band frequencies in the range of 3.7 GHz to 3.98 GHz, which are optimal for 5G because they provide the right balance of geographic coverage, capacity, and speed. At nearly $81 billion, the recent U.S. Federal Communication Commission (FCC) auction of 280 MHz C-band spectra was the highest-value spectrum sale in history.
Key features of the SKY66523-11:
- Wide operational frequency range: 3.55 to 4.2 GHz.
- Wide Instantaneous Bandwidth up to 280 MHz.
- High efficiency: PAE > 23% @ +30 dBm.
- High linearity: < -48 dBc ACLR at 30 dBm Pavg after DPD.
- High gain: >30 dB.
- Integrated active bias for temperature and process variation compensation.
- Integrated enable on/off function.
- Compact (16-pin, 5 x 5 x 1.3 mm) package compatible with a family of 4G and 5G Skyworks Pas.
The first portion of the C-band spectrum, referred to as “A-block,” is expected to be available by the end of this year. In anticipation of deploying as soon as the A-block spectrum becomes available, OEMs are already in the process of designing C-band systems. B-block and C-block spectrums are expected to be available by the end of 2023.
The demo incorporating the SKY66523-11 PA and the Xilinx Adaptable SoC shows multiple scenarios covering the full 280 MHz C-band spectrum with an occupied bandwidth (OBW) of up to 200 MHz, which is the maximum bandwidth won by any operator during the recent auction. In all scenarios, the combined Skyworks/Xilinx solution achieved Adjacent Channel Leakage Ratio (ACLR) compliance, a critical requirement of the 5G specification, making this combination ready for immediate A-block deployment and future B-block and C-block deployments.
“The majority of early 5G deployments are leveraging Xilinx technology for the radio. Along with our silicon platforms, Xilinx is providing industry-leading signal processing IP that is enabling both wider bandwidths required by C-band while also maintaining energy efficiency in the radio,” said Brendan Farley, vice president of wireless engineering at Xilinx. “This demonstration, together with Skyworks PA technology, shows how our Adaptable Digital RF IP can quickly scale to address new and emerging radio requirements.”
“Our demo with Xilinx highlights the readiness and maturity of this 5G solution and with the C-band auction concluded and winners announced, the next phase is for deployments as rapidly as possible,” said Yusuf Jamal, senior vice president, and general manager of diversified analog and AI solutions at Skyworks. “The C-band is a unique and important piece of the 5G landscape, and Skyworks has long been investing in and preparing to deliver innovative technologies that address this new spectrum.”
The Xilinx Zynq RFSoC Gen 3 is in full production and contains the direct RF transceivers along with the adaptable CFR (Crest Factor Reduction) and DPD (Digital Pre-Distortion) IP. The SKY66523-11 is part of a 5 × 5 mm pin-to-pin compatible family of PAs supporting major 3GPP bands and is sampling now.
Click here to learn more about SKY66523-11.
Click here to learn more about C band spectrum.