Characterizing Ultra-Low Intermodulation Distortion in RF Switches for Sub-6GHz Applications
Résumé
This paper presents apparatus and measurement results for ultra-low third-order Inter-Modulation-Distortion (IMD3) products of RF switches, with power levels below -100 dBm. Two setups are developed and calibrated for IMD3 measurements at 2.64 GHz and 5.4 GHz, respectively. The duplexers, the core components of the setups, are configured with a passband and stopband architecture to ensure a 50 Ω out-ofband environment, making the measurements independent of phase variations. With the stopband filter, the duplexers filter out the two high-power signal tones to prevent receiver compression, while allowing IMD3 signals to pass with low attenuation, enabling measurements with a high vertical dynamic range. SP6T RF switches from X-FAB foundry were characterized using the presented apparatus, achieving IMD3 measurements with power levels below -100 dBm.
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