Integrated circuit with at least one bump
View Patent ↗In an integrated circuit ( 1 ) having a substrate ( 3 ) and having a signal-processing circuit ( 4 ) which is produced at a surface ( 8 ) of the substrate ( 3 ), there is provided on the substrate surface ( 8 ) a protective layer ( 12 ) that has at least one aperture ( 13 ) through which a second contact pad ( 14 ) is electrically and mechanically connected to a first contact pad ( 9 ), wherein the second contact pad ( 14 ) is of a height of at least 15 μm and projects laterally beyond the aperture ( 13 ) on all sides and is seated on the protective layer ( 12 ) by an overlap zone (z) that is closed on itself like a ring, wherein the overlap zone (z) has a constant width of overlap (w) of between 2 μm and 15 μm, and wherein at least one element of the signal-processing circuit ( 4 ), and preferably only one capacitor ( 5 ) of the signal-processing circuit ( 4 ), is provided opposite the first contact pad ( 9 ).
1. An integrated circuit, having a substrate and having a signal-processing circuit, which signal-processing circuit is produced in a region of the substrate adjoining a surface of the substrate and has a plurality of circuit elements and at least one first contact pad, wherein the first contact pad has a first boundary face accessible from outside the substrate and a second boundary face opposite from the first boundary face, wherein the first contact pad is intended for the electroconductive connection of a component contact of a circuit component external to the integrated circuit to the signal-processing circuit, and having a protective layer that is electrically insulating and provided on the surface of the substrate to protect the regions of the integrated circuit covered by said protective layer, wherein for each first contact pad an aperture in the protective layer is provided, wherein for each first contact pad a second contact pad is provided that is of a height of at least 15 μm and is intended for direct connection to a component contact and extends through the relevant aperture to the first contact pad and is electroconductively connected to the first contact pad and is seated on the protective layer by an overlap zone that projects laterally beyond the aperture and is closed on itself like a ring, wherein, along the whole of its ring-like extent, the overlap zone projects beyond the aperture laterally by substantially the same width of overlap, wherein the width of overlap is in a range of between 2 μm and 15 μm, and wherein at least one element of the signal-processing circuit is provided opposite the second boundary face of the first contact pad.
2. An integrated circuit as claimed in claim 1 , wherein only one capacitor belonging to the signal-processing circuit is provided opposite the second boundary face of the first contact pad.
3. An integrated circuit as claimed in claim 2 , wherein the planar shape of the capacitor, which planar shape extends parallel to the surface of the substrates, and the planar shapes of the second contact pad and the aperture, which planar shapes also extend parallel to the surface of the substrates, are substantially the same, and the area of the planar shape of the capacitor is at most 10% larger than the area of the planar shape of the second contact pad.
4. An integrated circuit as claimed in claim 2 , wherein the capacitor is formed by a multilayer capacitor.
5. An integrated circuit as claimed in claim 2 , wherein at least one metal layer is provided between the first contact pad and the capacitor as a mechanical protective layer for the capacitor.
6. An integrated circuit as claimed in claim 2 , wherein the first contact pad comprises at least two metal layers that are connected together electrically and mechanically by electroconductive bridges.
7. An integrated circuit as claimed in claim 1 , wherein the width of overlap is of a nominal value of 7 μm.