Decoupling capacitor structure
AssigneeInternational Business Machines Corporation
InventorsJohn Galvagni, Richard G. Murphy, George J. Saxenmeyer
Life of this patent
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Abstract
A capacitor structure is described as having a plurality of dielectric materials located so that each dielectric material is in parallel between capacitor plates. The capacitor value of this structure is preset, therefore, for operation electrically at different specific temperatures. The description gives a specific stacked arrangement for the various dielectric materials in which this capacitor can be formed, as one example of that to which it is adaptable.
Claims5
An electrical capacitor structure for operating effectively as a decoupling capacitor at two different and spaced apart temperatures, comprising:
- two capacitor plate means spaced a predetermined distance apart;
- first dielectric material means, with a first dielectric constant to provide a predetermined capacitance value at a first predetermined temperature, located between said two capacitor plate means and in electrical contact with both of said two capacitor plate means;
- second dielectric material means, with a second dielectric constant to provide a predetermined capacitance value at a different temperature from said first predetermined temperature, located between said two capacitor plate means and also in electrical contact with both of said two capacitor plate means;
- at least one of said first and said second dielectric material means is divided into multiple blocks in a predetermined arrangement between said two capacitor plate means, and
- said first and said second dielectric material means are separated electrically by a low modulus material as a barrier to prevent an intermingling of said dielectric material means which can create a third dielectric material means having an unknown dielectric constant;
- whereby said electrical capacitor has predetermined values of capacitance at two different and spaced apart temperatures.
An electrical capacitor structure for operating effectively as a decoupling capacitor at different temperatures, comprising:
- two capacitor plate means with multiple blocks of at least two dielectric materials with different, predetermined dielectric constants;
- each of said multiple blocks of dielectric materials being arranged in predetermined stacks between said two capacitor plate means, and
- each of said multiple blocks being positioned to be in contact with both of said two capacitor plate means,
- wherein a total capacitance value of said structure is given by the relationship:
- ##EQU4## where:
- C=the total capacitance;
- K.sub.1 =dielectric constant of one dielectric material;
- K.sub.2 =dielectric constant of a second dielectric material;
- A.sub.1 =area of capacitor plate means in electrical contact with said one dielectric material;
- A.sub.2 =area of capacitor plate means in electrical contact with said second dielectric material;
- and
- T=dielectric thickness.
Dependencies are inferred from the claim text.