即使总线存在一定范围内的共模干扰，也能正确进行以上识别。测试原理框图如下图，其中框图中的U1是DUT供电电压、U2是共模电压、U3是差分电平。CANDT设备隐性输入电压限值测试原理框图CANDT设备显性输入电压限值测试原理框图注：ISO11898-2标准中，要求增大差分电压值的是电流源，由于电流源本身的输出电容较大，系统响应较慢，不适合来模拟电流源，这里使用电压源串联电阻的方式来等效电流源。CANDT测试流程隐性输入电压限值测试如测试原理框图连接状态，DUT和CANDT需正常通信；断开电压源U3，调节电压源U2，逐步将共模电压调到6.5V或-2V，在此期间DUT应能正常发送报文；调节电压源U3，逐步将差分电平调到隐性电平上限值0.5V，判断DUT是否能够正常发送报文，若能，则表示测试通过。
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发射器信号在短时间内频率呈线性增加，被称为线性调频(见)。线性调频以所需的模式重复。展示了雷达收发机。返回信号的频率在接收器(Rx)和发射频率的混合中生成不同的中频(intermediatefrequency，IF)。中频被数字化并用于确定移动和速度。芯片上的信号处理电路测量传输时间，并根据已知的无线电波速度计算距离。由于天线的高度方向性，可以检测到位置(方位角)。调频雷达也可以测量运动和速度。片上处理器负责计算，以提供的测量数据，灵活且可编程的传感器，用于多种应用。
