Keysight‘s VNA Best Captures 5G mmWave Power Amplifier EVM
Ultra-reliable low latency communication (uRLLC), massive MIMO, phased arrays—the implementation demands of 5G FR2 are propelling revolutionary transformation in communication technology. While normalized loads and linear behavior are every amplifier designer's dream, massive MIMO and beamforming architectures experience highly variable load conditions in practical applications. Further complexity is added with 5G FR2's millimeter wave (mmWave) carrier frequencies, wide-bandwidth signals, and complex modulation schemes which impose stringent component error vector magnitude (EVM) qualification. Designers face increasing challenges in generating accurate device models, minimizing design cycles, and certifying their device's 5G conformance with a traditional EVM measurement signal analyzer setup.
VNA Active Device Characterization Essentials, KEYSIGHT PNA Product Manager, Nizar Messaoudi, and Focus Microwave Executive Vice President, Vincent Mallette, discussed how using a vector network analyzer (VNA) instead of a signal analyzer to capture EVM simplifies the measurement set-up, enables measurement repeatability and allows component characterization under realistic load conditions. Nizar describes the critical importance of accurate, repeatable EVM measurements for power amplifiers (PAs), as well as the need for designers to subject their PAs to as realistic conditions as possible when gathering EVM data.
Although measuring a 5G mmWave power amplifier's EVM can be complex and error-prone, using Keysight's VNA with modulation distortion analysis software allows for faster EVM measurements with increased signal-to-noise-ratio (SNR) while under a modulated signal stimulus. Nizar shows how 5G's complex modulation signals can be generated by the vector signal generator (VXG), and in conjunction with the VNA's arbitrary load control application and a passive tuner, EVM under variable load conditions can be measured. This provides designers with realistic power amplifier performance measurements under beamforming conditions.
Expanding on Nizar's comments, Vincent Mallette provides an in-depth review of load-pull measurements, how to perform load-pull measurements with a passive tuner, and what the benefit of load-pull measurements is for power amplifiers. Both illustrate how modulation distortion analysis plus load pull on a VNA with a passive tuner is the best way to gain insight into how a PA would perform in beamforming phased array application.
Spurred by the demands of 5G, the pace of technological transformation in communication system architecture introduces a variety of design and test challenges. Achieving the lowest residual EVM is crucial for implementing power amplifiers in massive MIMO phased arrays with wide bandwidth signals and complex modulation schemes.
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本文由董慧转载自Keysight，原文标题为:VNA Best Captures 5G Amplifier EVM，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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