| 摘要 |
An RF power amplifier distortion measurement system (100) measures amplitude and phase distortion of a microwave/RF power amplifier (10) by phase quadrature down-conversion (110, 140) of each of an RF amplifier's input signal (S) and amplified output signal (KS+E) to baseband in-phase (I) and quadrature (Q) components, and performing RF amplifier distortion measurements on these down-converted baseband I and Q signals. The derived error measurement signal is remodulated to RF by phase quadrature up-conversion circuitry (190) to produce an up-converted RF signal (E) that corresponds to the RF distortion component contained in the RF output signal (KS+E) produced by the RF power amplifier (10).
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