Integrated circuit
AssigneeZarlink Semiconductor Inc.
InventorPeter Graham Laws
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Abstract
An integrated circuit having a substrate and an LC tank circuit comprises an inductor with parallel capacitors. The capacitors include triple plate integrated capacitors having a highest metal plate, a common middle plate and a lowest metal plate. The lowest plate is connected to a virtual ground node. A control circuit element connected to the middle plate allows the resonant frequency of the tank circuit to be controlled.
Claims23
An integrated circuit comprising a substrate, a frequency-selective circuit including at least one first multiplate capacitor, and a virtual ground node, said at least one first multiplate capacitor comprising:
- a first capacitor comprising a first plate and a second plate disposed between said first plate and said substrate;
- and a second capacitor comprising said second plate and a third plate disposed between said second plate and said substrate, said virtual ground node being connected to said third plate.
3 A circuit as claimed in claim 1, in which said first and second capacitors are electrically in series with each other.
Dependencies are inferred from the claim text.