基于ARM的功率放大器控制系统设计

针对发射机射频链路中功率放大器工作状态不稳定的问题,文中对射频链路的工作原理进行了研究,设计功放的控制系统。系统使用基于ARM架构的STM32F103ZG芯片作为主控芯片,可以通过TTL接口实现功放工作状态的实时采集。采集的功放工作状态经上位机程序分析后,结合发射机的指标参数下发功放的控制指令并调整功放的工作状态。测试结果表明,系统在输入功率为15.9 dBm时,达到1 dB压缩点-11.8 dBm;在25.7 dBm时,达到输出的三阶节点,此时的输入三阶节点为-2.7 dBm。以上结果证明该设计可以满足发射机的指标要求。

Design of Power Amplifier Control System Based on ARM

In order to solve the problem of unstable working state of power amplifier in RF link of transmitter, this paper studies the working principle of RF link and designes the control system of power amplifier. This system uses STM32F103ZG chip based on ARM architecture as the main control chip, which can realize the real-time acquisition of the working state of power amplifier through TTL interface. After the working state of the power amplifier is analyzed by the upper computer program, combined with the indicators of the transmitter, the control instructions of the power amplifier are issued, and the working state of the power amplifier is adjusted. The test results show that the system achieves 1 dB compression point-11.8 dBm at the input power of 15.9 dBm. Additionally,the output third-order node is reached at 25.7 dBm, and the input third-order node is -2.7 dBm, which indicates that the design can meet the requirements of the transmitter.