US Patent 7635888 Interdigitated capacitors
Patent 7635888 was granted and assigned to Agere Systems on December, 2009 by the United States Patent and Trademark Office.
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The specification describes matched capacitor pairs that employ interconnect metal in an interdigitated form, and are made with an area efficient configuration. In addition, structural variations between capacitors in the capacitor pair are minimized to provide optimum matching. According to the invention, the capacitor pairs are interdigitated in a manner that ensures that the plates of each pair occupy common area on the substrate. Structural anomalies due to process conditions are compensated in that a given anomaly affects both capacitors in the same way. Two of the capacitor plates, one in each pair, are formed of comb structures, with the fingers of the combs interdigitated. The other plates are formed using one or more plates interleaved between the interdigitated plates.
US Patent 07635888 Interdigitated capacitors US Patent 7635888 Interdigitated capacitors
US Patent 07635888 Interdigitated capacitors
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