Semiconductor device
First Claim
1. A semiconductor device, comprising:
- a first circuit that operates on a first frequency and a second circuit that operates on a second frequency lower than the first frequency located over a semiconductor substrate;
a first source line that gives operating voltage to the first circuit;
a second source line that gives operating voltage to the second circuit;
a ground line to which grounding electric potential is given; and
at least two kinds of decoupling capacitors which are connected between the first source line and the ground line and which have an MOS structure;
wherein regarding the at least two kinds of decoupling capacitors, at least one side between a gate length and a gate width of a gate electrode which forms the MOS structure is set as different length.
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Accused Products
Abstract
While improving the frequency characteristics of a decoupling capacitor, suppressing the voltage drop of a source line and stabilizing it, the semiconductor device which suppressed decline in the area efficiency of decoupling capacitor arrangement is offered.
Decoupling capacitors DM1 and DM2 are connected between the source line connected to the pad for high-speed circuits which supplies electric power to circuit block C1, and the ground line connected to a ground pad, and the capacitor array for high-speed circuits is formed. A plurality of decoupling capacitor DM1 are connected between the source line connected to the pad for low-speed circuits which supplies electric power to circuit block C2, and the ground line connected to a ground pad, and the capacitor array for low-speed circuits is formed. Decoupling capacitor DM1 differs in the dimension of a gate electrode from DM2.
30 Citations
22 Claims
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1. A semiconductor device, comprising:
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a first circuit that operates on a first frequency and a second circuit that operates on a second frequency lower than the first frequency located over a semiconductor substrate;
a first source line that gives operating voltage to the first circuit;
a second source line that gives operating voltage to the second circuit;
a ground line to which grounding electric potential is given; and
at least two kinds of decoupling capacitors which are connected between the first source line and the ground line and which have an MOS structure;
wherein regarding the at least two kinds of decoupling capacitors, at least one side between a gate length and a gate width of a gate electrode which forms the MOS structure is set as different length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A semiconductor device, comprising:
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a first circuit that operates on a first frequency and a second circuit that operates on a second frequency lower than the first frequency located over a semiconductor substrate;
a first source line that gives operating voltage to the first circuit;
a second source line that gives operating voltage to the second circuit;
a ground line to which grounding electric potential is given;
a first decoupling capacitor that is connected between the first source line and the ground line and that has an MOS structure; and
a second decoupling capacitor that is connected between the second source line and the ground line and that has an MOS structure;
wherein the first decoupling capacitor is set up so that at least one side of a gate length and a gate width of a gate electrode which form the MOS structure is smaller than the second decoupling capacitor.
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Specification