def METHOD_NAME(self):
    self.well_offset = self.pmos.tap_offset
    well_y = self.pmos_insts[0].get_pin("vdd").cy() - 0.5 * self.nwell_width
    well_y = self.get_pin("vdd").cy() - 0.5 * self.nwell_width
    well_ll = vector(0, well_y)
    self.add_rect("nwell", well_ll, self.width , self.height - well_y