How do you measure the capacitance of a bondpad? I know it doesn't really matter as much for digital but its important when dealing with RF. I Googled but got a lot of patents
Thanks in advance.
Thanks in advance.
Now I just have to figure out how to model it. I have a boards with space for a few MEMs devices but there are only the pads there now. I just wanted to know if it was possible to do something in the lab to measure the capacitance.You will need to model it to extract the C-parasitics at the pad. Industry would use something like Ansoft's Q3D Extractor to model the device and extract the C (and R and L if you like) parasitics by placing a sink and source around the bondpad contact. The simulator would then electrically model the bond pad behaviour according to the source/sink arrangement. If you assume uniform source and sink area across the bond pad you will get the pure-C of the bond pad.
It is very difficult to empirically measure the RLC parasitics of bond pads because of the negligible small values of these elements. I did quite a lot of work of these some years back.
Dave
No its not raw chip die pads. It is a small board that has 3 bondpads on it. Similar to the bondpads in this picture but only 3.Just curious, are you talking raw chip die pads?