Method for restraining integrated circuit electricity supply network noise by using decoupling capacitance

Abstract

The invention discloses a method for restraining integrated circuit electricity supply network transient voltage drop noise by using decoupling capacitance, belonging to the physical design field of superlarge-scale integrated circuit, in particular to the technical category of optimizing network noise of transient power wire earth wires, which is characterized in that the creation points lie in that: (1) proposing a rapid method for estimating a decoupling capacitance demand in a layout stage; proposing a two-dimensional function showing the decoupling capacitance demand in a chip; (3) establishing a supply and demand system for the demand of the decoupling capacitance by utilizing the two-dimensional function to guide that the layout process is performed toward the direction being beneficial for reducing the demand of the decoupling capacity; and (4) proposing a layout algorithm for adding the decoupling capacitance through integrating the above model and the method into a force direction layout. Experiments prove that the method of the invention is effective, and can achieve the layout result that the total amount of the decoupling capacity is decreased by about 35% with the cost that the on-line length is increased by about 0.5%.

Description

Technical field [0001] The method of using decoupling capacitors to suppress the noise of the integrated circuit power supply network belongs to the field of very large scale integrated circuit (VLSI) physical design, especially the technical category of transient power line ground network noise optimization in the physical design field. Background technique [0002] The power supply network of an integrated circuit includes a power line network and a ground line network (collectively called a power ground line network). The design of the power ground wire network belongs to the special wire network wiring in the physical design of integrated circuits. The power supply ground wire network design mainly needs to solve the problem of power supply voltage drop noise. With the continuous advancement of integrated circuit technology, the feature size of the chip is continuously reduced, the integration level and operating frequency of the chip are greatly improved, and the operating ...

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Problems solved by technology

Their different placement will obviously have a significant impact on the power supply performance of the power ground network

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