Increase in DC Voltage supply

[mohazaga]

HI ,,,

I connect the voltage supply to my circuit and I setted to supply Vdd of Max. 3.3 volt, but when circuit working I found the Vdd rise up to 4 volt (DC Voltage supply).
I don't know why? any help?
( I connect the VDDO=ESD protection to Vdd too)

Thanks

 

[pranam77]

May i know whats your circuit and what sort of power supply you are using?

 

[mohazaga]

Hi ,,,
the circuit which I test is SCL inverter, I designed to be supplied by Vdd=3.3, and the inputs are two square pulses 0-3.3 V opposite to each other (one rise up, second fall down). The power supply is external power supply adjusted to give 3.3V with max. 5mA.

Thankx

 

[pranam77]

Extremely sorry my friend. It is out of my knowledge. Hope some one knowledgeable may help you in this regard. Best of luck.

 

[dipnirvana]

what is the model no. for the external supply . I hope it' s problem of your supply!

tell me one more thing , how much current you are drawing as shown in the supply