Abstract: The present invention provides a method for verifying a design of a circuit board that has a wiring layer connecting components to be mounted, a power layer, and an insulating layer formed between the wiring layer and the power layer. According to this method, detection of chippings in the power layer is performed. The chipping is, for example, a gap, a slot, or a slit, and corresponds to one wiring layer and interrupts a region in which the wiring layer and the power layer are opposed to each other. When chippings are detected, a common-mode voltage expected to be caused owing to each of the chippings is computed. Subsequently, the position of the chipping and the value of the common-mode voltage caused owing to the chipping are outputted. Thus, the priorities of the chippings, to which countermeasure for suppressing radiation of electromagnetic waves should be applied, can easily be decided.

Abstract: Layout of a high-speed signal wiring on a power supply plane is checked and specified at an optimum position capable of minimizing a spurious electromagnetic radiation so as not to affect other wiring layers. When a high speed signal line which is an object to be checked exists on a power supply plane, a perpendicular distance between the high speed signal line and the plane which is nearest to the signal line is determined, and compared with a minimum required distance computed therefor in advance on the basis of its circuit specification of the high speed signal line. If the perpendicular distance determined does not exceed the minimum required distance computed, an appropriate message corresponding to the name of the high speed signal line is displayed.

Abstract: The check system comprises the steps of: computing the optimum position and the optimum capacitance value of the bulk capacitor on a wiring printed circuit board mounting an IC which is an object of checkup, using simple mathematical expressions; determining if an actual capacitance value and an actual position of the bulk capacitor tentatively designed are nearly equal to the optimum value and optimum position computed; determining if the tentatively designed capacitance value of the bulk capacitor exceeds a value of a total sum of capacitance values of decoupling capacitors multiplied by a predetermined constant; and if the optimum conditions are not satisfied, displaying appropriate instructions to modify the tentative design value and position of the bulk capacitor to coincide with the optimum value and position.

Abstract: A check system for a wiring structure of a printed circuit board for easily calculating an electric energy of a high-speed signal wiring on the printed circuit board and warning when the energy owned by the signal wiring is larger than a designated threshold value. The electric energy radiated from the high-speed signal wiring intended for checking is calculated by using a simple mathematical expression, and a display to identify the signal wiring is outputted when the electric energy owned by the signal wiring is larger than a certain designated threshold value, and also an instructing message to relocate in an internal layer of the circuit board is outputted against the signal wiring.

Abstract: The present invention provides a method for verifying a design of a circuit board that has a wiring layer connecting components to be mounted, a power layer, and an insulating layer formed between the wiring layer and the power layer. According to this method, detection of chippings in the power layer is performed. The chipping is, for example, a gap, a slot, or a slit, and corresponds to one wiring layer and interrupts a region in which the wiring layer and the power layer are opposed to each other. When chippings are detected, a common-mode voltage expected to be caused owing to each of the chippings is computed. Subsequently, the position of the chipping and the value of the common-mode voltage caused owing to the chipping are outputted. Thus, the priorities of the chippings, to which countermeasure for suppressing radiation of electromagnetic waves should be applied, can easily be decided.

Abstract: The check system comprises the steps of: computing the optimum position and the optimum capacitance value of the bulk capacitor on a wiring printed circuit board mounting an IC which is an object of checkup, using simple mathematical expressions; determining if an actual capacitance value and an actual position of the bulk capacitor tentatively designed are nearly equal to the optimum value and optimum position computed; determining if the tentatively designed capacitance value of the bulk capacitor exceeds a value of a total sum of capacitance values of decoupling capacitors multiplied by a predetermined constant; and if the optimum conditions are not satisfied, displaying appropriate instructions to modify the tentative design value and position of the bulk capacitor to coincide with the optimum value and position.

Abstract: Layout of a high-speed signal wiring on a power supply plane is checked and specified at an optimum position capable of minimizing a spurious electromagnetic radiation so as not to affect other wiring layers. When a high speed signal line which is an object to be checked exists on a power supply plane, a perpendicular distance between the high speed signal line and the plane which is nearest to the signal line is determined, and compared with a minimum required distance computed therefor in advance on the basis of its circuit specification of the high speed signal line. If the perpendicular distance determined does not exceed the minimum required distance computed, an appropriate message corresponding to the name of the high speed signal line is displayed.

Abstract: A check system for a wiring structure of a printed circuit board for easily calculating an electric energy of a high-speed signal wiring on the printed circuit board and warning when the energy owned by the signal wiring is larger than a designated threshold value. The electric energy radiated from the high-speed signal wiring intended for checking is calculated by using a simple mathematical expression, and a display to identify the signal wiring is outputted when the electric energy owned by the signal wiring is larger than a certain designated threshold value, and also an instructing message to relocate in an internal layer of the circuit board is outputted against the signal wiring.