半双工RS-485收发器的发送电路设计  

The design of transmitting circuit of half-duplex RS-485 communication transceiver

作　　者：刘艳丽[1] 应建华[1] 宋敏[1] 邹望辉[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2004年第2期49-51,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

摘　　要：介绍了一种半双工RS 4 85通信收发器的发送电路的设计 ,该电路具有数据传输率高 ( 2 .5Mbit/s)、大驱动电流 (可驱动 32个收发器 )的特点 ,且具有高电压保护和过流保护的功能 .为了进一步提高电路性能 ,在设计中灵活运用了肖特基势垒二极管 .并用candence公司的spectre进行仿真 。This paper introduced the design of transmitting circ ui t of half-duplex RS-485 communication transceiver. It was characterized by hig h speed (2.5?Mbit/s), great driven current (able to drive 32 transceivers), and protection against high voltage and supercurrent. In order to improve the circu it performance, Schottky barrier diode was used. Spectre software was used to si mulate and verify the design. The simulation results indicated that the design a chieved the goals expected.

关 键 词：RS-485接口协议 发送电路 肖特基势垒二极管 恒流源 

分 类 号：TN431.1[电子电信—微电子学与固体电子学]