POWER AMPLIFIERS WITH ADAPTIVE BIAS FOR ENVELOPE TRACKING APPLICATIONS

• Main Authors: FARAHVASH SHAYAN, PALASKAS GEORGIOS, XU HUIMING, LYALIN ALEKSEY A
• Format: Patent
• Language: Chinese; English
• Published: 07.12.2021
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY

Power amplifiers with adaptive bias for envelope tracking applications are provided herein. In certain embodiments, an envelope tracking system includes a power amplifier that amplifies a radio frequency (RF) signal and that receives power from a power amplifier supply voltage, and an envelope tracker that generates the power amplifier supply voltage based on an envelope of the RF signal. The power amplifier includes a field-effect transistor (FET) for amplifying the RF signal, and a current mirror including an input that receives a reference current and an output connected to the power amplifier supply voltage. An internal voltage of the current mirror is used to bias the gate of the FET to compensate the FET for changes in the power amplifier supply voltage arising from envelope tracking. 本文提供了具有用于包络跟踪应用的自适应偏置的功率放大器。在一些实施例中，包络跟踪系统包括：功率放大器，其放大射频(RF)信号并接收来自功率放大器供电电压的功率；以及包络跟踪器，其基于RF信号的包络生成功率放大器供电电压。功率放大器包括用于放大RF信号的场效应晶体管(FET)；以及包括接收参考电流的输入端和连接到功率放大器供电电压的输出端的电流镜。电流镜的内部电压用于偏置FET的栅极，以对FET补偿由包络跟踪引起的功率放大器供电电压的变化。