sharkies
Member level 5
I have a RF drive amplifier and I'm using TSMC 0.9nm NMOS_RF for it. It has 12 fingering with 2.5um for each finger. The transistor has roughly 2mA going through it.
I checked my transistor layout provided by the PDK, and it shows that each fingering diffustion area has metal1(including contact) width of .14um . Since it is it has 12 fingering, this gives roughly .14um*6=.84um of metal width at the drain and source node to carry the 2mA. This falls short of the 1mA/um current density rule that we use as rule of thumb.
Do I have to increase the diffusion area and increase metal1 width? I'm thinking that this is the right solution, but it will cause tremendous amount of rework. not fun!
Can I just ignore current density problem and move on? Will it absolutely cause a problem? Or is it just more of a reliability problem that can go undetected for research purpose ICs.
let me know
I checked my transistor layout provided by the PDK, and it shows that each fingering diffustion area has metal1(including contact) width of .14um . Since it is it has 12 fingering, this gives roughly .14um*6=.84um of metal width at the drain and source node to carry the 2mA. This falls short of the 1mA/um current density rule that we use as rule of thumb.
Do I have to increase the diffusion area and increase metal1 width? I'm thinking that this is the right solution, but it will cause tremendous amount of rework. not fun!
Can I just ignore current density problem and move on? Will it absolutely cause a problem? Or is it just more of a reliability problem that can go undetected for research purpose ICs.
let me know
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