How to Test Power Amplifiers with Modulated Signals

ENA Vector Network Analyzer
+ ENA Vector Network Analyzer

Testing power amplifiers with modulated signals on a VNA

Testing a power amplifier (PA) with modulated signals to ensure compliance with 5G New Radio (NR) standards requires wideband, calibrated vector signal generation and signal analysis. A single testbed with a vector network analyzer (VNA), vector signal generator (VSG), and multiple measurement software applications provides fully-calibrated signal generation and analysis.

The measurement software applications enable accurate adjacent channel power ratio (ACPR) and low residual error vector magnitude (EVM) measurements on the VNA. During testing, the engineer operates multiple measurement applications without changing the configuration of the test setup.

Power amplifier modulated signal test solution

Power amplifier modulated signal test solution

Testing power amplifiers for 5G compliance requires modulated signal stimulus. The Keysight ENA-X network analyzer, MXG signal generator, and modulation distortion software provide the vector-calibrated wideband signals necessary for high-fidelity measurements. The integrated upconverter at port 1 of the ENA-X upconverts the modulated signal from the MXG up to the maximum frequency of 44 GHz. The wide dynamic range and vector error correction of the ENA-X results in extremely low residual test-set EVM, yielding a complete picture of the PA's performance without test system interference. Measure EVM with optional demodulation — the MOD software decomposes the linear and nonlinear signal components with spectral correlation to characterize PAs up to 50% faster.

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