中圖分類號： TN409 文獻(xiàn)標(biāo)識碼： A DOI：10.16157/j.issn.0258-7998.211856 中文引用格式： 孫建民，閆江，張龍，等. 一種高速施密特觸發(fā)器的設(shè)計(jì)[J].電子技術(shù)應(yīng)用，2022，48(2)：28-31. 英文引用格式： Sun Jianmin，Yan Jiang，Zhang Long，et al. Design of a high-speed Schmitt trigger[J]. Application of Electronic Technique，2022，48(2)：28-31.
Design of a high-speed Schmitt trigger
Sun Jianmin1，Yan Jiang2，Zhang Long3，Zhao Yicheng3
1.School of Big Data and Information Engineering，Guizhou University，Guiyang 550025，China； 2.School of Iinformation，North China University of Technology，Beijing 100144，China； 3.Beijing Zhongke Greenway Technology Co.，Ltd.，Beijing 100089，China
Abstract： 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_0.18 μm_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.
Key words : Schmitt trigger；transconductance operational amplifier；curent amplifier
