Charge-coupled device with reduced signal distortion
AssigneeU.S. Philips Corporation
InventorsAdrianus T. Van Zanten, Hendrikus J. M. Veendrick, Leonardus C. M. G. Pfennings
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Abstract
The invention relates to a CCD input and reference charge generator, in which the occurrence of electron injection into the substrate (due to cross-talk to the substrate) and hence undesired signal distortions is prevented. For this purpose, the generator is provided with a voltage divider (26) which is constituted at least for a part (28) by a resistance element arranged outside the substrate, for example, by a polycrystalline silicon resistor. Thus, it is achieved that input diode zones (11) are no longer connected to the substrate voltage.
Claims18
A charge-coupled device comprising a monocrystalline semiconductor body having a layer-shaped region of the one conductivity type which adjoins a major surface and is provided with:
- a charge transport channel for storing and transporting supplied information in the form of charge packets;
- electrical connection means for applying a voltage V.sub.BB to the layer-shaped region;
- an input circuit comprising a zone (designated as an input diode) of the second conductivity type, and supply means for supplying a signal-dependent voltage to the input diode, characterized in that the said supply means comprise a voltage divider having a junction point which is coupled to the input diode and a first resistance element connected between the junction point and a reference voltage and a second resistance element connected between the junction point and V.sub.BB, which second resistance element comprises an element arranged outside the monocrystalline semiconductor body, and the second resistance element comprises a resistance layer which is applied to an insulating layer covering the surface of the semiconductor body.
Dependencies are inferred from the claim text.