High-Power Amplifier Testing

The document outlines how the R&S®ZNA vector network analyzer from Rohde & Schwarz is designed to meet the demanding requirements of high-power amplifier testing. Amplifier characterization is inherently complex, requiring test equipment that can handle high power levels, ensure stable and accurate measurements, and support multiple test parameters and setups. The R&S®ZNA addresses these challenges through a configurable hardware infrastructure that enables tailored test setups, including direct channel access with step attenuators for challenging high-power conditions.

Key features include up to four independent direct digital synthesis (DDS) sources and an internal combiner, facilitating rapid intermodulation and “hot S22” tests without external signal sources. The analyzer provides a unique 100 dB power sweep range with automatic level control (ALC), ensuring exceptional linearity, power accuracy, and stability even when external boosters or preamplifiers are used. Additional capabilities such as integrated pulse modulators, pulse profiling, multiple sweep modes (magnitude, frequency, AM/AM, and AM/PM), and external power supply control for power-added efficiency (PAE) testing enhance its value for comprehensive amplifier evaluation.

The ZNA’s modular design allows further extension for on-wafer chip characterization, impedance tuning, harmonic load pull tests, and noise figure measurements in collaboration with industry partners. In summary, the R&S®ZNA provides a versatile, high-precision platform for high-power amplifier testing, ensuring reliable results and supporting advanced industry applications through both standalone features and potential system integrations.