射频收发器的工作原理是什么 射频收发器的应用

Release time：2022-12-27
author：Ameya360
source：网络
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　　今天Ameya360电子元器件采购网讲给大家带来RF，射频。它是大多数无线电设备使用的通信方式，从深空通信网络到手机。在射频收发机中，接收和发送无线电波的任务都是由共同的电路和部件完成的。

       当作为接收机工作时，天线捕获无线电波，调谐器隔离期望频率的电波，检测器或解调器从电波中提取信息。当作为发射机时，收发机的电路产生一个不断变化的电流。然后对电流进行调制，使其包含信息信号。然后，调制的正弦波沿着天线传播，并作为无线电波进行传输。

射频收发器的工作原理是什么 射频收发器的应用

　　在电子学理论中，电流流过导体，导体周围会形成磁场；交变电流通过导体，导体周围会形成交变的电磁场，称为电磁波。

　　在电磁波频率低于100kHz时，电磁波会被地表吸收，不能形成有效的传输，但电磁波频率高于100kHz时，电磁波可以在空气中传播，并经大气层外缘的电离层反射，形成远距离传输能力，我们把具有远距离传输能力的高频电磁波称为射频，英文缩写：RF。

　　一、射频收发器的工作原理和应用

　　以TRF6900型号的射频收发器为例：其内部集成了完整的发射电路和接收电路。它的工作频率范围为850~950MHz，供电电压范围为2.2~3.6V，射频输出功率高达+5bBm，而待机模式时的电流消耗仅在0.5μA~5μA之间，TRF-6900采用高吞吐率16-bitRISC结构，其最快速率可达8MIPS。另外，这种收发器还具有FM/FSK调制模式并采用三线制串行接口，因而可很方便地与微控制器相连接，可用于ISM频段内的数据双向无线传输。

　　射频收发器传输广泛地运用在车辆监控、遥控、遥测、小型无线网络、无线抄表、门禁系统、小区传呼、工业数据采集系统、无线标签、身份识别、非接触RF智能卡、小型无线数据终端、安全防火系统、无线遥控系统、生物信号采集、水文气象监控、机器人控制、无线232数据通信、无线485/422数据通信、数字音频、数字图像传输等领域中。


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