ustc_tweeg
Newbie level 6
hi, I meet with a problem about mosvar and need some help.
I make two mosvar and test them at 2GHz with bias voltage sweeping from -1.8v to 1.8v.
mosvar1: n+ poly; n+ source/drain in n-well
mosvar2: p+ poly; n+ source/drain in n-well
As for the mosvar1 the c-v curve soon reaches a maximum value at about 1v, and then holds on for higher bias voltage. While the mosvar2 keeps rising upon positive bias, and no sign of slowing down.
I wonder why the poly doping makes so big a difference?
I make two mosvar and test them at 2GHz with bias voltage sweeping from -1.8v to 1.8v.
mosvar1: n+ poly; n+ source/drain in n-well
mosvar2: p+ poly; n+ source/drain in n-well
As for the mosvar1 the c-v curve soon reaches a maximum value at about 1v, and then holds on for higher bias voltage. While the mosvar2 keeps rising upon positive bias, and no sign of slowing down.
I wonder why the poly doping makes so big a difference?