為解決采用315 MHz或433 MHz頻段無(wú)線接收模塊的系統(tǒng)，干擾源多，接收靈敏度低，設(shè)計(jì)調(diào)試復(fù)雜等問題，提出了一種868 MHz無(wú)線接收模塊的設(shè)計(jì)方案。方案中采用英飛凌低功耗單芯片FSK/ASK超外差無(wú)線接收器TDA5210，以及少量的外圍分立器件。通過改善接收模塊PCB中銅箔天線走向，提高接收靈敏度;在接收模塊的電源和地的輸入端串入磁珠，以減少來(lái)自應(yīng)用系統(tǒng)中晶振等高頻器件的噪聲干擾。實(shí)驗(yàn)結(jié)果表明，基于TDA5210的無(wú)線接收模塊，設(shè)計(jì)調(diào)試簡(jiǎn)單，干擾源少，抑制噪聲能力強(qiáng)，接收靈敏度高，工作穩(wěn)定。

　　Abstract:

　　The appliance system of wireless receive module which works in 315MHz or 433MHz has some problems such as many interference sources，low receive sensitivity，complex design and debugging. To solve the problems，a design of 868MHz wireless receive module was proposed in the 868MHz receive module，the Infineon low power consumption single chip FSK/ASK superheterodyne receiver TDA5210 and few peripheral discrete components were used. The receive sensitivity was increased by improving the layout of PCB antenna. The noise from the crystal in the appliance system was decreased by using the magnetic bead in input terminal of the power and ground. The results indicate that the wireless receive module based on TDA5210 is easy to design and debugging，and has advantages such as few inferference sources，strong ability of noise reduction，high receive sensitivity，and works steadily.