【选型】电子围栏射频功放模块驱动放大器推荐:ASB功率放大器ASX401,高线性,高增益
电子围栏是公安机关收集用户信息用户打击犯罪的一套装置,其工作原理是通过能模拟运营商网络信号的射频单元强制使用户位置更新并收集用户信息,然后将用户信息回传至后台数据库做信息的深度挖掘。
电子围栏中的核心设备是射频收发单元,其中发射功率1瓦到几十瓦不等,射频驱动放大器是必不可少的器件,通常要求高线性、封装简单。针对电子围栏等专网射频功放模块应用,推荐ASB推出的砷化镓工艺功率放大器ASX401,工作频率300-3000MHz,工作电压5V,900MHz频率典型增益19.5dB,输出1dB压缩点29.5dBm,具体电气性能参数如下:
图1 ASX401功率放大器电气参数
从上图中可以看出ASX401可以覆盖电子围栏用到的主流通信频率,提供19.5dB典型增益和29.5dBm的输出1dB压缩点,采用SOT-89封装,OIP3达到47dBm,可以提高发射端线性余量,以下是ASX401的封装实物图和典型应用电路。
图2 ASX401封装尺寸
图3 ASX401在1900MHz工作频率典型应用电路
射频驱动放大器ASX401输入和输出都是标准50欧姆内匹配,由于该器件最高输出功率接近1W,在实际应用电路中需要注意输入输出端对地电容与器件引脚之间的微带长度,同时输出端L1电感建议采用射频电感。
综上所述,ASB的射频放大器ASX401具有300-3000MHz的工作频率,可以覆盖主流电子围栏应用频率;同时具有高线性、SOT-89简单封装和符合RoHS标准的特性,是电子围栏等专网射频功放驱动放大器的优秀选择。
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