Thin film resistors of different materials
First Claim
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1. A method of forming a resistor disposed on a substrate comprising the steps of:
- depositing a first seed layer of a first resistive material on said substrate with a first thickness and a first crystal structure;
depositing a second layer of a second resistive material different from said first resistive material on said substrate with a second thickness and a second crystal structure such that said second crystal structure is controlled by said first crystal structure; and
patterning said first and second layers of resistive material to define a resistor.
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Abstract
An integrated circuit includes a bilayer thin film resistor in which the lower layer is a seed layer that controls the crystal structure of the upper layer. The thickness of the lower layer and the thickness of the upper layer may be chosen to form a resistor with a TCR having a design value.
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Citations
20 Claims
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1. A method of forming a resistor disposed on a substrate comprising the steps of:
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depositing a first seed layer of a first resistive material on said substrate with a first thickness and a first crystal structure; depositing a second layer of a second resistive material different from said first resistive material on said substrate with a second thickness and a second crystal structure such that said second crystal structure is controlled by said first crystal structure; and patterning said first and second layers of resistive material to define a resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of forming at least two types of resistors disposed on a substrate comprising the steps of:
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depositing a first layer of a first resistive material on said substrate with a first thickness and a first crystal structure; patterning said first layer of resistive material to form at least two pads; depositing a second layer of a second resistive material different from said first resistive material on said substrate with a second thickness and a second crystal structure such that said second crystal structure is controlled by said first crystal structure and said second thickness is adapted to combine with said first thickness to generate a final sheet resistivity having a design value; patterning said second layer of resistive material to remove said second layer of resistive material above at least one of said at least two pads, whereby a first type of resistor is formed from a bilayer of said first resistive material and said second resistive material and a second type of resistor is formed from said first resistive material only without said second resistive material. - View Dependent Claims (12, 13)
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14. An integrated circuit comprising at least one resistor of a first resistor type disposed on a substrate comprising:
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a first layer of a first resistive material deposited on said substrate with a first thickness and a first crystal structure; a second layer of a second resistive material different from said first resistive material deposited on said substrate above at least said first layer of resistive material with a second thickness and a second crystal structure such that said second crystal structure is controlled by said first crystal structure and said second thickness is adapted to combine with said first thickness to generate a final change of resistance with temperature having a design value. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification