eexuke
Full Member level 4
Dear all,
Usually we use the top-most metal for our clock and power, but I have learned
1)top-most metal usually has largest capacitance
2)top-most metal usually has smallest capacitance
then RC delay of top-most metal cancel out each other for large C and small R.However, the wider metal is more suspective to skin-effect which will increase resistance when frequence reaches GHz domain.
So why we still use top-most metal for clock/power?
Many thanks in advance!
Usually we use the top-most metal for our clock and power, but I have learned
1)top-most metal usually has largest capacitance
2)top-most metal usually has smallest capacitance
then RC delay of top-most metal cancel out each other for large C and small R.However, the wider metal is more suspective to skin-effect which will increase resistance when frequence reaches GHz domain.
So why we still use top-most metal for clock/power?
Many thanks in advance!