什么是EMI滤波器?
在电子电路中应用电磁干扰(EMI)滤波器,以提高系统对来自邻近电路的非有用外部电磁信号的抗干扰能力,并通过消除非有用频率(“噪音”)来避免发出可能干扰附近相同电路的辐射。
EMI噪音可以通过耦合(电容性或磁性)、传导(共模或差模),或电磁场耦合(天线效应)的方式对有用的数据线信号产生不利影响,可能改变其功能。
意法半导体的EMI滤波器和ASIP技术的优点
意法半导体的EMI滤波器主要优点是将提供系统级所需的ESD保护与用于抑制数字或模拟通信线路上EMI噪声的滤波器集成在单片上(根据标准IEC 61000-4-2 Level 4 +8kV触点),以节省空间:
- 对于低速数字接口或模拟应用,意法半导体提供集成了ESD保护的EMI滤波器,目的是保护存储卡、麦克风、扬声器、并行显示器,以及键盘的线路。
- 对于高速数据线电路(比如HDMI 2.0、HDMI 2.1、 USB3.2、USB4.0、Display Port 2.0、SD-Card 4.2、MIPI DSI或CSI通信),意法半导体定制的共模滤波器集成了ESD保护(ECMF),可拒绝广泛的频段(如5G、LTE、2.4 GHz蓝牙、2.4 GHz和5 GHz Wi-Fi等)。
对于需要更高集成度以节约空间和提高性能的特定应用,意法半导体开发了基于其特定应用集成产品(ASIP)技术的集成电路。该技术将系统级ESD保护(IEC61000-4-2)与分立器件(R、L、C)、过压和过流保护,以及其他IP(如低压降稳压器、去毛刺滤波器)和信号调节技术(多路复用器、电平转换器等)整合起来。意法半导体的ASIP缩减了系统尺寸、降低了复杂性和成本,同时改进失效(FIT)率,延长使用寿命。
意法半导体面向汽车应用的EMI滤波器、ECMF和ASIP通过AEC-Q101认证,且符合IEC 61000-4-2和ISO 10605标准。它们在SerDes应用(包括FPD-link、GMSL、MIPI DSI或CSI)中非常有用,可避免车联网(V2X)(5.9 GHz)和全球导航卫星系统(GPS、Glonass、北斗、伽利略和IRNSS)频率中的辐射现象。
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