[metallization question]

HI Friends,

As a follow up on my previous  post, I also wanted to get the following queries on processing answered -

1. The final step in my process is metallization, but the problem is that there is a step in the oxide. How can I smoothen this step ? Also, what is the maximum height of the step that will still enable me to metallize ?

2. In the final step , I also want to fill the via's with metal to contact the underlying n+ region. What is the ideal aspect ratio for this ?

Is there any standard reference online or in print  that can help answer such queries on fabrication?

Thanks

[foundry CMOS]

Hi folks,

Which is the best place to know more about the processing details in a foundry CMOS process ? ( like dielectric stack thickness and material etc..)

[LED Grayscale driver circuit]

Hi folks,
I need to know a CMOS Grayscale circuit to drive an LED. Also, can someone please explain the basic idea of how a grayscale driver works ?

thanks