Power supply network analyzing method, computer program for executing the method, storage medium and power supply network analyzing apparatus

A computer program which executes power supply network analysis for analyzing a characteristic of a power supply network having circuit elements to be supplied with power over power supply lines as current sources and constructed by dividing the power supply lines into resistor elements by using a net list of the power supply network, comprising:

• a first step of replacing the circuit elements with the current sources having consumed source current values to be consumed in the circuit elements and replacing resistor components of the power supply lines with resistor elements which connect between predetermined nodes, based on input design information and physical information, thereby extracting an entire net list;
• a second step of selecting a portion of the power supply network which includes the current sources and in which the resistor elements are connected in series, and extracting a partial net list from the entire net list extracted in the first step;
• a third step of extracting a compressed net list which is the partial net list simplified;
• a fourth step of replacing the partial net list with the compressed net list and acquiring voltage values of the predetermined nodes and values of currents flowing in the resistor elements by analyzing the entire net list;
• and
• a fifth step of acquiring the voltage values of the predetermined nodes in the partial net list and the values of currents flowing in the resistor elements in the partial net list by giving both end nodes of the partial net list to voltage values of the predetermined nodes acquired by the fourth step.

A storage medium in which a computer readable program is stored to execute power supply network analysis for analyzing a characteristic of a power supply network having circuit elements to be supplied with power over power supply lines as current sources and constructed by dividing the power supply lines into resistor elements by using a net list of the power supply network, the program comprising:

• a first step of converting the circuit elements to the current sources based on design information and computing the resistor elements included in the power supply lines based on physical information, thereby extracting an entire net list;
• a second step of extracting a partial net list of a portion of the power supply network which includes the current sources and in which the resistor elements are connected in series;
• a third step of acquiring a compressed net list by performing circuit compression on the partial net list;
• a fourth step of replacing the partial net list with the compressed net list and acquiring voltage values of individual nodes in the entire net list and current values between the individual nodes in the entire net list by applying a supply voltage to a power supply terminal in the entire net list;
• and
• a fifth step of acquiring the voltage values of the individual nodes in the partial net list and the current values between the individual nodes in the partial net list by giving both end nodes of the partial net list to voltage values of the individual nodes in the entire net list acquired by the fourth step.

A power supply network analyzing apparatus analyzing a characteristic of a power supply network having circuit elements to be supplied with power over power supply lines as current sources and constructed by dividing the power supply lines into resistor elements by using a net list of the power supply network, comprising:

• design information storage means for storing circuit information including parameters of the circuit elements and connecting relations between the circuit elements as design information;
• physical information storage means for storing, as physical information, layout information including layout information of the circuit elements and layout information of the power supply lines and process device information including line type information of the power supply lines;
• selection means for selecting a portion of the power supply network which includes the current sources and in which the resistor elements are connected in series, based on the physical information;
• entire-net-list extracting means for extracting an entire net list by converting the circuit elements to the current sources and acquiring connecting relations between the circuit elements based on the design information stored in the design information storage means, and by computing the resistor elements included in the power supply lines and acquiring layout information of the circuit elements based on the physical information stored in the physical information storage means;
• partial-net-list extracting means for extracting the portion selected by the selection means as a partial net list based on the design information and the physical information;
• net compressing means for acquiring a compressed net list by performing circuit compression on the partial net list;
• first calculation means for replacing the partial net list with the compressed net list and acquiring voltage values of individual nodes in the entire net list and current values between the individual nodes in the entire net list by applying a supply voltage to a power supply terminal in the entire net list;
• second calculation means for acquiring voltage values of individual nodes in the partial net list and current values between the individual nodes in the partial net list by giving both end nodes of the partial net list to voltage values of the individual nodes in the entire net list;
• and
• confirmation means for confirming results of operations performed in the first and second calculation means.