Study on the mechanism of Latch-up effect in CMOS IC and its countermeasures

Based on inverter, the structure of CMOS IC are presented. The model of pnpn diode is took to analyze the mechanism of Latchup effect in CMOS IC. Many means are introduced to how to avoid, decrease or eliminate the Latchup effect in layout, technological process and circuits application level. It guarantee the wide utilization for CMOS IC.