Re: ESD protection?
I just want to design a simple ESD pretection circuit for the input of my circuit
it seems like I can use this basic configuration with PMOS and NMOS. But I am a little confused why it used two ESD element with a current limiting resistor in between? usually what's the value of this current limiting resistor? it is said this resistor can limit the current flowing into the internal circuit, but does this resistor influence the function of the internal circuit?
and I also read that "It is critical to ensure that the avalanche breakdown of the primary protection devices is activated before the secondary protection devices enter their thermal breakdown so that the secondary ESD protection devices will not be destroyed by ESD stress.", but how can I know the exact avalanche breakdown and thermal breakdown voltages of each devices? how can I simulate a ESD protection devices to see its function? until now I only know people need to use large devices for the ESD protection circuits.