1.152 Mbps速率的红外通信驱动电路设计  

Design of Infrared Communication Driver Circuit at 1.152 Mbps Rate

作　　者：刘正翔[1] LIU Zheng-xiang(Robotics College, Fuzhou Polytechnic, Fuzhou 350108, China)

机构地区：[1]福州职业技术学院机器人学院,福州350108

出　　处：《湖南工程学院学报（自然科学版）》2020年第1期24-27,共4页Journal of Hunan Institute of Engineering(Natural Science Edition)

基　　金：2018年福建省中青年教师教育科研资助项目(JZ180626).

摘　　要：红外通信由红外发射二极管(IRED)发射二进制信号进行数据传输.然而红外光传输速率为1.152 Mbps(IrDA规范的MIR速率)时,发射管“熄灭”延迟特性明显,即红外光在该速率发射时无法完全“熄灭”,其本质是IRED内部结电容的载流子无法快速释放,仍进行微弱的复合发光,导致IRED端电压一直处在较高电平波动,从而影响可靠接收.提出一种具有载流子清除的驱动电路,在发射管“熄灭”瞬间,将其接入一个接地回路,释放载流子,从而快速降低端电压.实验表明,在1.152 Mbps速率下采用本设计驱动电路可快速清除过剩载流子,并使端电压快速下降为零,下降时间仅约50 ns,上升时间仅约20 ns.同时实验表明接收电路可接收到较为规整的方波信号,进行可靠传输.Infrared communication transmits binary signals by infrared emitter diode(IRED)for data transmission.However,when the emission rate of infrared light is 1.152 Mbps(MIR rate of IrDA specification),the delay characteristic of emitter“extinguishing”is obvious.That is,infrared light can not be completely“extinguished”when it emits at this rate.Its essence is that the carriers of the junction capacitance in IRED can not be released quickly,and the weak compound luminescence still takes place,which results in the constant voltage of the IRED terminal.It fluctuates at a higher level,thus affecting reliable reception.In this paper,a driver circuit with carrier clearance is proposed.At the moment of the transmitter tube’s“extinguishing”,it is connected to a grounding circuit to release the carrier,thus rapidly pulling down the low-end voltage.Experiments show that at 1.152 Mbps speed,the designed driver circuit can quickly remove the excess carriers and rapidly reduce the terminal voltage to zero,with a drop time of only 50 ns and a rise time of only 20 ns.At the same time,experiments show that the receiving circuit can receive regular square wave signals and transmit them reliably.

关 键 词：红外通信 红外发射二极管 过剩载流子 调制速率 

分 类 号：TN929.12[电子电信—通信与信息系统]