Design of CAN FD receiver with ultra-wide common-mode input range
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针对在负压干扰条件下,控制器局域网(Control Area Network,CAN)总线接收器存在工作异常以及传输延时较大的问题,设计了一种超宽共模输入范围的可变速率的CAN(CAN with Flexible Data rate,CAN FD)接收器.该设计通过电平移位与共射级相结合的方式,以减少总线信号对输入级静态工作点影响,拓展接收器的负压输入范围;采用电阻分压的方式衰减总线信号电平,以减轻输入级差分对管的耐压负担;引入低温漂电压,以产生高精度的翻转阈值;在输出级模块增添限幅晶体管,以限制接收器输出摆幅,提升传输速度.芯片采用0.18μm60 V双极、互补、双扩散金属氧化物半导体工艺进行电路设计.仿真结果表明,在5 V电源电压条件下,设计接收器的共模输入范围为-60～60 V,阈值电压为0.71 V,迟滞门限为120 mV,温漂为0.057 mV/℃,平均传输延时小于55 ns.与相关设计相比,设计的接收器具有较宽的共模输入范围,传输延时较小,符合CAN协议规范.
In view of the abnormal operation of the control area network(CAN)bus receiver under negative pressure interference and the large transmission delay,a CAN with flexible data rate(CAN FD)receiver with ultra-wide common-mode input range is designed.Through the combination of level shift and common-emitter stage,the influence of the bus signal on the static work-point of the input stage is reduced,so as to extend the negative voltage input range of the receiver.The resistor voltage division method is used to attenuate the bus signal level,which reduces the withstand volt-age burden of the input stage differential pair tube.A low temperature coefficient voltage is intro-duced to produce a highly accurate receiver flip threshold.A clamped transistor is added to the out-put stage to limit the output swing of the receiver and increase the transmission speed.The chip is fabricated on 0.18 pm 60 V bipolar complementary metal oxide semiconductor and double diffused metal oxide semiconductor process.Simulation results show that,at 5 V supply voltage,the common mode input range of the designed receiver is-60～60 V.The threshold voltage is 0.71 V.The hys-teresis threshold is 120 mV and the temperature coefficient of the threshold voltage is less than 0.057 mV/℃.The average transmission delay is less than 55 ns.Compared with related designs,the designed receiver has a wide common-mode input range,a small transmission delay,and conforms to the CAN protocol specification.
CAN receivercommon mode input rangereceiver threshold voltagehigh-speed trans-missionnegative pressure interference
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