can analog pad be used as power pad (power is ac sinosuid)

Dear Her1,

Her1 said:

So can I use analog pad as a power pad having ac sinosuid signal.

and will it require a Esd protection circuit ?

I am not sure I fully appreciate the scope of your question - sorry! What is the context of your question? Is this a layout or simulation question?

Shawn

At this point consider  it as a general

For say in ac computing ac signals(simosuids)  are directly used to supply power to the core instead of convertimg it to dc.

So I just to know Which pads can be used for the power.

As there is no Dc power as VDD

I hope you understood my question niw

Dear Her1,

At this point consider it as a general

For say in ac computing ac signals(simosuids) are directly used to supply power to the core instead of convertimg it to dc.

So I just to know Which pads can be used for the power.

As there is no Dc power as VDD

To be honest, I think a more relevant question relates to the compatibility of your external AC signal relative to the power pad requirements. Specifically, an external DC voltage input to a power pad must have a voltage that is consistent with the technology maximum voltage limit (in your case 65 nm) and have a polarity consistent with the substrate bias. Further, the external DC source will attempt to provide a conduit for the supply current to your on-chip circuit. Hence, you must design the power pad and its connecting traces to meet the reliability requirements for your design (i.e., number of pads and their traces to the circuit under study must be chosen and designed to have current densities that are less than your DC electromigration reliability limits)

If you use the power pad for an external AC input to power your circuit, you must assure that its dynamic range is consistent with the technology and substrate biasing (i.e., will the AC source's voltage at any time fall below the substrate bias?). You must also examine the current supplied to your circuit carefully as now the current is AC in nature, and this will impact your electromigration limits. Finally, with respect to ESD, the AC source maximum and minimum values must also be low enough to all maintain the ESD protection diodes within their effective range.

Hence, I view your issue as one of choosing a power pad with a set of associated traces and an ESD protection network that are consistent with the external AC power source and the current it will provide to your circuit under test.

Shawn

Thank you for a desriptive reply.

Let me be more clear.

I am providing an internally generated ac signal through wireless power transfer.

Body biasing leakage current all other parameters have been considerd.

As ac signal is used as Vdd.

So I am confused about assigning a power pad for it.

Assigning a power pad incase of malfunctioning or checking the signals internal.

I want to assign a power pad to it.

So my question right now is 

In Tsmc 65 nm  documente Analog power pads named as  PVDD3A/3AC are given can these be used for analog power  ac sinosuid signals.

If yes what can be the other requirements for it.

If no what can be the alternate for it.

Dear Her1,

In your response, you noted that you are using an "internally generated ac signal  through wireless power transfer". This suggests to me your circuit and application are low power. 

So, the question I pose to you is why you need a power pad at all? A power pad is designed to provide a much higher power level and is designed for an external input signal (i.e. a direct connection to the chip I/O). Neither of these conditions apply if I understand your last post.

Does this make sense to you? Just because you are calling your wireless AC signal a power source does not justify the use of a power pad.

Shawn

Sorry.

Actually it will be externally generated through coil.