Title:
ノイズ低減に適したプリント配線基板の設計を支援する設計支援装置
Document Type and Number:
Japanese Patent JP4649047
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a CAD device that performs part placement suited to reducing electromagnetic emission. SOLUTION: A part priority setting part 1106 determines, regarding passive parts among parts to be disposed on a printed circuit board, their part ranking in ascending order of impedance value of teach part, and a disposition part 1107 disposes, in the vicinity of power pins of disposed parts excluding passive parts, the passive parts in the order of the determined part ranking. Also, the part priority setting part 1106 comprises a table that holds plurality of allowable distances, between the pins, to each passive part and holds each corresponding inductance value, a means to convert, for every passive part, the distance between the pins into the inductance value stored in the table, and a means to sort the converted inductance values in an ascending order to define the part ranking, and changes the descending order of effective frequency range of the passive parts whose impedance is equal to or below a threshold into ascending order of the impedance.
Inventors:
Takeshi Nakayama
Fukumoto Yukihiro
Hiroshi Ikeda
Shinichi Tanimoto
Fukumoto Yukihiro
Hiroshi Ikeda
Shinichi Tanimoto
Application Number:
JP2001019268A
Publication Date:
March 09, 2011
Filing Date:
January 26, 2001
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
G06F17/50; H05K3/00
Domestic Patent References:
| JP11259551A | ||||
| JP7307412A | ||||
| JP11144996A | ||||
| JP11204372A | ||||
| JP4106667A |
Attorney, Agent or Firm:
Shiro Nakajima