Loadpull Test Report for KW47

Overview

This application note details the loadpull characterization of the NXP KW47 wireless microcontroller. The report explains the methodology for measuring supply current, transmit power, and harmonic levels while the complex output load seen by the device under test (DUT) is tuned in amplitude and phase. Using a Maury Microwave automated impedance tuner and IVCAD software, the tests were conducted at 2440 MHz with VSWR ratios of 1:1, 2:1, and 3:1. Key findings indicate that a poor quality antenna (VSWR 3:1) can cause up to 2.51 dB in transmit power variation and an additional 3.44 mA in current consumption. The document also notes that second harmonics (H2) are sensitive to load mismatches and may occasionally exceed ETSI limits under poor VSWR conditions.

Referenced Parts