Abstract
This letter presents a wideband digital power amplifier (DPA) with Class-G technique to enhance back-off efficiency for Internet-of-Things (IoT) applications. The switched-capacitor power amplifier topology is adopted for high linearity performance. A wideband matching network is proposed to achieve 0.54–0.95-GHz frequency coverage for 802.11ah and narrowband IoT standards. The measurement results demonstrate a flat frequency response with only 0.5-dB power deviation over 0.54–0.95 GHz. The DPA achieves the peak output power of 23.5 dBm with 42.7% peak PAE and 32.8% PAE at 6-dB back off. When amplifying an 8-MHz 64 quadratic-amplitude modulation 802.11ah signal at 800 MHz, it obtains −28.4-dB error vector magnitude and 30.1% average PAE at 16.5-dBm average output power.
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