Digital Envelope Tracking Benefits for 5G, 6G, and Wi-Fi 7 Mobile Devices

This paper discusses the benefits of digital envelope tracking (DET) for high-performance mobile devices. A series of measurements are made using an evaluation board including the Murata HF496 DET tracker and various ultra-high band FEMs deployed in commercial mobile devices. The specific DET tracker implementation discussed naturally extends to support multiple simultaneous transmission techniques such as carrier aggregation or MIMO. The DET solution tolerates 6 ns envelope signal misalignment, up to 12 cm distance between PMIC and FEM, and up to 1.2 nF PA bypass capacitance. Most importantly, DET reduces dissipated power by 30% (up to 1 W) for high-throughput signals having bandwidth 20 MHz to 200 MHz.