一种高速施密特触发器的设计  

Design of a high-speed Schmitt trigger

作　　者：孙建民 闫江 张龙 赵以诚 Sun Jianmin;Yan Jiang;Zhang Long;Zhao Yicheng(School of Big Data and Information Engineering,Guizhou University,Guiyang 550025,China;School of Iinformation,North China University of Technology,Beijing 100144,China;Beijing Zhongke Greenway Technology Co.,Ltd.,Beijing 100089,China)

机构地区：[1]贵州大学大数据与信息工程学院,贵州贵阳550025 [2]北方工业大学信息学院,北京100144 [3]北京中科格励微科技有限公司,北京100089

出　　处：《电子技术应用》2022年第2期28-31,共4页Application of Electronic Technique

摘　　要：在数字隔离器系统中,因为存在电路寄生效应和随机噪声,数字信号的波形会发生严重畸变。针对该问题,提出了一种电压—电流模式高速施密特触发器,该电路能有效还原信号的波形。电路主体结构采用电流放大器和跨导运算放大器相结合,在输入高速数据时,电流放大器提供了快速的前馈通路来增加比较器的响应速度,实现施密特触发器的高速翻转。设计采用GF_0.18μm_BCD工艺,在电源电压5 V的条件下,可实现500 MHz高速信号的整形,信号的传输延时为652 ps。In the digital isolator system,due to the existence of circuit parasitics and random noise,the waveform of the digital signal will be severely distorted.Aiming at this problem,a voltage-current mode high-speed Schmitt trigger is proposed,which can effectively restore the signal waveform.The main structure of the circuit uses a combination of a current amplifier and a transconductance operational amplifier.When inputting high-speed data,the current amplifier provides a fast feedforward path to increase the response speed of the comparator and realize the high-speed flip of the Schmitt trigger.This design adopts the GF_0.18μm_BCD process,under the condition of the power supply voltage of 5 V,it can realize the shaping of the 500 MHz high-speed signal,the transmission delay of the signal is 652 ps.

关 键 词：施密特触发器 跨导运算放大器 电流放大器 

分 类 号：TN409[电子电信—微电子学与固体电子学]