Some quesntion about POR (POWER ON RESET)

[fendy]

Dear all, I have designed a POR cirtuit (the first picture).But I find another type POR(the second picture).Who can help me to analyse these two circuit ?
Best Regards

 

[tsanlee]

In POR1 ,When the AVDD with fast rising time,the POR wavrform maybe failure ( POR 2 Times)
The Cap in POR1 is 70fF,The MOS leakage will make POR1 failure in high temp.

POR2 is robust design.


In POR circuit design, You must check any VDD waveform in all application .

 

[Analog_starter]

Hi tsanlee,

Could you show me some reference about POR with the bandgap+resistor divider+comparator+delay structure?

Thanks!!!

Analog_starter