Lithographic apparatus and device manufacturing method

Photocopying – Projection printing and copying cameras – Step and repeat

Reexamination Certificate

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C355S072000, C355S075000, C700S186000

Reexamination Certificate

active

10894366

ABSTRACT:
A lithographic apparatus is presented that includes a controller having a series connection of at least two integrators and an integrator output circuit for deriving an output quantity of the series connection of integrators. The controller also includes an integrator saturator that is operatively coupled to the integrator output circuit and having an operating area for passing through the output quantity and a saturation area for saturating the output quantity. A saturation control mechanism for controlling saturation sets an output quantity of at least one of the series-connected integrators to a neutral value, when the integrator saturator is in the saturation area, except when the output quantity of or an input quantity of at least one of the series-connected integrators has a value such that it would tend to bring the integrator saturator from the saturation area to the operating area.

REFERENCES:
patent: 3911391 (1975-10-01), Held et al.
patent: 5229872 (1993-07-01), Mumola
patent: 5296891 (1994-03-01), Vogt et al.
patent: 5523193 (1996-06-01), Nelson
patent: 5969441 (1999-10-01), Loopstra et al.
patent: 6046792 (2000-04-01), Van Der Werf et al.
patent: 6260282 (2001-07-01), Yuan et al.
patent: 2001/0015901 (2001-08-01), Motoori
patent: WO 98/33096 (1998-07-01), None
patent: WO 98/38597 (1998-09-01), None
patent: WO 98/40791 (1998-09-01), None

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