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《Journal of Electron Devices》 2005-03
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Design and Simulation of CMOS Schmitt Trigger

CHENG Kun, QIN Ming, ZHANG Zhong-ping, HUANG Qing-an (Key Laboratory of MEMS of Ministry of Education, Nanjing 210096, China)  
An improved design formula of CMOS Schmitt trigger is introduced. The transistor scale design formula of general CMOS Schmitt trigger is analyzed and the drawback is taken into account. From the discussion, something not proper to the formula is pointed out. Based on the theory of the true threshold voltage of the trigger presented by I.M.Fianosky, the influence on threshold voltage caused by M_2 and M_5 is considered. A practical example is given to explain how to design a CMOS Schmitt trigger with the new design formula under certain design and process conditions.
【Fund】: 国家自然科学基金(60476019);; 江苏省自然科学基金(BK2003052)资助项目。
【CateGory Index】: TN783
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