關於ESD input and output pin 保護電路設計

ritafung

For input pins, you may put PDIO + NDIO + small resistor to protect the gate oxide
* S& K$ i( I" K" AFor output pins, you may directly use GDPMOS and GGNMOS or use the output switch (if large enough) to forward the current to power / ground for +ve and -ve ESD pulse respectively

any other suggestion?

ritafung

只需要在gate和body之間連上一個diode即可
因為cdm是從substrate透過gate oxide流到 input pad (假設此pad接地)
" d9 q6 \" ?4 @4 C. j若加上cdm diode,它能提供一條捷徑從substrate流到input pad