How Does DPD Optimize SSPAs for Better Linearity?
Getting maximum power from your SSPA without creating signal distortion is a constant challenge. This trade-off between power and linearity often forces unwanted compromises in system design and efficiency. The best way to optimize an SSPA is by using Digital Pre-Distortion (DPD).1 DPD digitally models the amplifier’s non-linear behavior, including memory effects2, and creates an inverse distortion signal. This pre-corrected signal, when amplified, results in a clean, linear output even near saturation. I’ve spent years in the lab pushing amplifiers to their limits. The goal is always the same: get as much clean power as possible. You need high linearity for today’s complex modulation schemes, but you also need high […]
How to Accurately Determine RF Power Amplifier Efficiency?
You trust the datasheet for amplifier efficiency. But your real-world SSPA design overheats and performs poorly. I will show you how to measure the real efficiency and avoid these problems. To accurately determine RF power amplifier efficiency, you must go beyond the datasheet. Use a high-precision digital multimeter and a calibrated power meter. De-embed your test setup using S2P files. And most importantly, test with realistic modulated signals using a 3-5dB power back-off. Datasheet numbers are a great starting point, but they are far from the whole story. They represent an ideal world that rarely exists in a final product. Understanding the gap between the datasheet and reality is the […]
How to Choose Between GaN and GaAs Microwave SSPAs?
Choosing between GaN and GaAs SSPAs is tricky. GaN’s smaller size is appealing, but its non-linearity can secretly tank your system performance1. Let’s find the right solution. Choose GaN for higher power density and a smaller footprint, but be prepared for its non-linearity. To maintain signal integrity, you must implement Digital Pre-Distortion (DPD) and a 3-5 dB power back-off. For applications demanding high linearity without DPD, GaAs remains a solid choice.2 Performance Dimension GaAs SSPA GaN SSPA Power Density Low (0.5 ~ 1 W/mm) Extremely High (3 ~ 10 W/mm or higher) Linearity Superior (Inherent good linearity) Good (Requires digital pre-distortion DPD) Breakdown Voltage Moderate (~ 10 ~ 20 V) […]
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