Semiconductor integrated circuit capable of compensating for flucuations in power supply voltage level and method of manufacturing the same
First Claim
1. A semiconductor integrated circuit comprising:
- a power-source line and a ground line;
a logic circuit portion composing a logic circuit and connected to said power-source line and ground line; and
a constant-voltage auxiliary circuit connected, in parallel with said logic circuit portion, to said power-source line and ground line, said constant-voltage auxiliary circuit consuming power by causing a current to flow from said power-source line to said ground line in a stable state in which an output value from said logic circuit portion does not vary and halting said power consumption when the output value from said logic circuit portion varies.
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Accused Products
Abstract
In a semiconductor integrated circuit, a CMOS logic circuit receives a voltage from a power-source line, while releasing a current through a ground line. A constant-voltage auxiliary circuit is disposed in parallel with the CMOS logic circuit. The constant-voltage auxiliary circuit receives an output signal from the CMOS logic circuit. The constant-voltage auxiliary circuit consumes power when the output signal from the CMOS logic circuit is stable to maintain a potential difference between the power-source line and the ground line at a specified voltage and halts power consumption when the output signal from the CMOS logic circuit is inverted, i.e., when the potential difference is decreasing, thereby suppressing the decrease of the potential difference. Accordingly, voltage fluctuations on the power-source line are suppressed.
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Citations
12 Claims
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1. A semiconductor integrated circuit comprising:
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a power-source line and a ground line; a logic circuit portion composing a logic circuit and connected to said power-source line and ground line; and a constant-voltage auxiliary circuit connected, in parallel with said logic circuit portion, to said power-source line and ground line, said constant-voltage auxiliary circuit consuming power by causing a current to flow from said power-source line to said ground line in a stable state in which an output value from said logic circuit portion does not vary and halting said power consumption when the output value from said logic circuit portion varies. - View Dependent Claims (2, 3)
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4. A semiconductor integrated circuit comprising:
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a plurality of logic circuits; a first power-source line connected to each of said logic circuits and carrying a specified power-source voltage; a second power-source line different from said first power-source line; and a voltage supplying circuit connected to said first and second power-source lines, said voltage supplying circuit detecting a variation in any of voltages supplied from said first power-source line to said logic circuits from the value of said specified power-source voltage to another value and supplying, upon detection, a voltage from said second power-source line to said first power-source line. - View Dependent Claims (5, 6, 7, 8)
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9. A semiconductor integrated circuit comprising:
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an internal semiconductor circuit; a power source connected to said internal semiconductor circuit; a first power-source monitor line for monitoring a level of a power-source voltage supplied from said power source to said internal semiconductor circuit; a second power-source monitor line for monitoring a level of the power-source voltage inside said internal semiconductor circuit when said internal semiconductor circuit is in operation; and a level-fluctuation compensator connected to said first and second power-source monitor lines, said level-fluctuation compensator detecting fluctuations in the level of the internal power-source voltage when said internal semiconductor circuit is in operation and adjusting, upon detection of fluctuations in the level of the operating voltage, the power-source voltage inside said internal semiconductor circuit to be equal in level to the power-source voltage from said power source. - View Dependent Claims (10, 11)
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12. A mask processing method for a semiconductor macro cell, comprising a mask processing step for the semiconductor macro cell using a computer comprising:
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a power-source-line-configuration retrieving step of retrieving a power-source-line configuration from an entire region occupied by the cell; an inverted-geometry generating step of generating an inverted geometry corresponding to said entire region occupied by the cell except for power-source lines and wiring in a wiring layer containing the power-source lines; a dividing step of dividing said generated inverted geometry into a plurality of geometries; a mask operation step of adding said post-division inverted geometries to said retrieved power-source-line configuration; and a power-source-line reducing step of reducing the power-source-line configuration including said additional post-division inverted geometries by the magnitude of a specified minimum wire spacing.
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Specification