M. Fallon et al., DESIGN CONSIDERATIONS FOR A GAUDI TEST STRUCTURE WHICH CAN BE USED TODETERMINE THE OPTIMUM FOCUS, IEEE transactions on semiconductor manufacturing, 7(3), 1994, pp. 272-278
A test structure is described which can be used to optimize the focus
of wafer steppers. Simulation is used to examine the effect that some
of the design parameters have on the sensitivity of the structure. Fin
ally some practical measurements are presented.