PRINTED CIRCUIT BOARD DESIGNING APPARATUS AND PRINTED CIRCUIT BOARD DESIGNING METHOD

• US 20090249265A1
• Filed: 03/24/2009
• Published: 10/01/2009
• Est. Priority Date: 03/28/2008
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: ARATA, Akira
• Application Number:
  US12/409,995
• Publication Number:
  US 20090249265A1
• Time in Patent Office: Days
• US Class Current: 716/137
• CPC Class Codes: G06F 30/367 Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
• CPC Class Codes: G06F 30/39 Circuit design at the physical level physical level design for reconfigurable circuits G06F30/347

Abstract

A method for designing a printed circuit board includes: determining a distance along a conductive line between an electronic component and a signal source which are mounted on the printed circuit board, the signal source transmitting a signal to the electronic component; calculating a maximum distance for preventing a voltage across the electronic component in a steady state from being superimposed with a reflected signal reflected from at the signal source, the maximum distance being between the electronic component and the signal source, the voltage caused by the signal, and simulating whether an amplitude of a voltage applying across the electronic component is within a given range when the distance is longer than the maximum distance.

Claims

1. An apparatus for designing a printed circuit board comprising:

a determining section for obtaining data of a distance along a conductive line between a electronic component and a signal source which are mounted on the printed circuit board, the signal source transmitting a signal to the electronic component;

a controller for obtaining data of a maximum distance for preventing a voltage across the electronic component in a steady state from being superimposed with a reflected signal reflected from at the signal source, the maximum distance being between the electronic component and the signal source, the voltage caused by the signal; and

a simulator for determining whether an amplitude of a voltage applying across the electronic component is within a given range when the distance is longer than the maximum distance.

2. The apparatus according to claim 1, further comprising a display for notifying the conductive line when the amplitude of the voltage is out of the given range.

3. An apparatus for designing a printed circuit board comprising:

a first determining section for determining positions of electronic components mounted on the printed circuit board and conductive line formed on the printed circuit board on the basis of data related to a circuit formed on the printed circuit board;

a controller for obtaining data of a condition of constraint for a distance between two of the electronic components on the basis of characteristic data of at least the printed circuit board and the electronic components;

a calculator for obtaining a distance along the conductive line between the electronic components the basis of the positions of the electronic components and the conductive line;

a second determining section for determining whether the distance satisfies the condition; and

a simulator means for obtaining data of an amplitude of a signal applied across the electronic component on the basis of positions of electronic components, the condition of constraint, and the distance when the distance is determined as being out of the condition.

4. The apparatus according to claim 3, further comprising a display for displaying distinctly each the conductive line being out of the condition of constraint in the conductive lines displayed.

5. The apparatus according to claim 3, wherein the distance is obtained by using of Manhattan distance.

6. A method for designing a printed circuit board comprising:

determining a distance along a conductive line between an electronic component and a signal source which are mounted on the printed circuit board, the signal source transmitting a signal to the electronic component;

calculating a maximum distance for preventing a voltage across the electronic component in a steady state from being superimposed with a reflected signal reflected from at the signal source, the maximum distance being between the electronic component and the signal source, the voltage caused by the signal; and

simulating whether an amplitude of a voltage applying across the electronic component is within a given range when the distance is longer than the maximum distance.

7. The method according to claim 6, further comprising notifying the conductive line when the amplitude of the voltage is out of the given range.