 下面是[SX1231低功耗UHF RF收发器应用电路]的电路图SX1231是低功耗集成的UHF RF收发器,工作频率包括433, 868 和 915 MHz无许可证的ISM频段,所有主要的RF通信参数是可编程的,大多数可动态设定. SX1231在1.2kbps是的灵敏度高达-120dBm,采用16节的FIR通路滤波器,因而有好的选择性,可编程输出,从-18dBm到+17dBm, FSK, GFSK, MSK, GMSK 和OOK调制,主要用在自动读表, 无线传感器网络,家庭和建筑物自动化,无线告警和安全系统,工业监视和控制等. SX1231应用:
Automated Meter Reading
Wireless Sensor Networks
Home and Building Automation
Wireless Alarm and Security Systems
Industrial Monitoring and Control
 图1.SX1231简化方框图  图2.SX1231接收器方框图  图3.SX1231发送器方框图  图4.SX1231应用电路图  图5.SX1231 +13dBm应用电路图  图6.SX1231 +17dBm应用电路图  图7.TX 匹配网络 The matching network is comprised of the following stages: LT1, CT1: Together with both PCB and device (packaging) parasitics forms a resonant load at the required output frequency. LT2, CT2: For applications that need to comply with the requirements of ETSI EN 300 220, this network forms a band stop filter resonant at the second harmonic. CT3 provides a DC block. CT4, CT5, LT3: Form a low-pass harmonic filter.  图8.LNA 匹配网络 (：电路图) |
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