应用于模拟开关芯片的过压保护电路设计  

Design of overvoltage protection circuit applied to analog switch chip

作　　者：张林 李婕妤 汪洋 金湘亮 ZHANG Lin;LI Jieyu;WANG Yang;JIN Xiangliang(School of Physics and Optoelectronics Engineering,Xiangtan University,Xiangtan 411105,China;School of Physics and Electronics,Hunan Normal University,Changsha 410081,China)

机构地区：[1]湘潭大学物理与光电工程学院,湖南湘潭411105 [2]湖南师范大学物理与电子科学学院,湖南长沙410081

出　　处：《传感器与微系统》2022年第10期71-74,78,共5页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(61774129,61827812,61704145);湖南省科学技术厅湖湘高层次人才聚集项目(2019RS1037);湖南省科技厅战略性新兴产业科技攻关与重大科技成果转化项目(2019GK4016)。

摘　　要：针对模拟开关的输入端口信号变化快、电压过高的风险,基于0.18μm BCD工艺,设计一种过压保护电路。电路中有双级迟滞保护,能有效防止输入端口电压过高,避免电路反复开启。经过测试,在输入端电压增加到4.54 V时,输出保护信号;输入端电压减小到4.12 V时,输出恢复信号。模拟开关的过压保护开启时间为2.80μs,恢复时间为1.84μs。测试结果与设计要求基本符合,该电路可用于模拟开关领域。Aiming at the risk of rapid signal change and excessive voltage at the input port of the analog switch, based on the 0.18 μm BCD process, an overvoltage protection circuit is designed.There is a two-stage hysteresis protection in the circuit, which can effectively prevent the input port voltage from being too high and avoid the circuit from turning on repeatedly.The circuit is tested, when the input voltage increases to 4.54 V,the protection signal is output.When the input voltage is reduced to 4.12 V,a recovery signal is output.The on-time of overvoltage protection for analog switch is 2.80 μs, and the recovery time is 1.84 μs.The test results meet the design requirements, and the circuit can be used in the field of analog switches.

关 键 词：模拟开关 过压保护 双级迟滞 开启 恢复 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]