Motherboard with board having terminating resistance

• US 6,328,572 B1
• Filed: 07/27/2000
• Issued: 12/11/2001
• Est. Priority Date: 07/28/1999
• Status: Expired due to Fees

• Current Assignee: KEL Corporation (Koninklijke Philips N.V.)
• Original Assignee: KEL Corporation (Koninklijke Philips N.V.)
• Inventors: Makino, Kimiyasu, Higashida, Hiroshi
• Primary Examiner(s): PATEL, TULSIDAS C
• Application Number:
  US09/626,357
• Time in Patent Office: 502 Days
• Field of Search: 439/61, 439/65, 361/784, 361/785, 361/788
• US Class Current: 439/61
• CPC Class Codes: G06F 13/409 Mechanical coupling back panels H05K7/1438
• CPC Class Codes: H05K 1/023 using auxiliary mounted passive components or auxiliary substances printed passive components H05K1/16
• CPC Class Codes: H05K 1/141 One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters H05K1/142 and H05K1/147 take precedence
• CPC Class Codes: H05K 2201/044 Details of backplane or midplane for mounting orthogonal PCBs
• CPC Class Codes: H05K 2201/10022 Non-printed resistor
• CPC Class Codes: H05K 2201/10189 Non-printed connector
• CPC Class Codes: H05K 3/366 substantially perpendicularly to each other H05K3/361 takes precedence
• CPC Class Codes: H05K 3/368 parallel to each other H05K3/361 takes precedence
• CPC Class Codes: H05K 7/1458 Active back panels; Back panels with filtering means

Abstract

The motherboard MB₁ of the present invention is a motherboard comprising a plurality of plug connectors 12 installed on the front face of the board 11 and a bus line for inter-connecting these plug connectors so as to allow inter-communication of daughter boards DB₁-DB₇ connected to the plug connectors 12. The motherboard is configured such that a termination board TB₁ having a terminating resistance to decrease reflection noise of the bus line is connected to the plug connector at the last slot S8 of the bus line among the plug connectors 12, 12, . . . installed on the front face of the motherboard. Alternatively, the motherboard is configured such that the termination board is connected to the rear face of the last slot S8.

Claims

1. A motherboard comprising a board, a plurality of connector elements installed on said board, and a bus line which is formed on said board for interconnecting said plurality of connector elements, so as to allow interconnection of a plurality of daughter boards connected to said plurality of connector elements via said bus line, wherein

a termination board having a terminating resistance to decrease reflection noise of said bus line is connected to a connector element at the last stage of said bus line among said plurality of connector elements;

one of said plurality of daughterboards being comprised of a CPU board for performing high-speed arithmetic processing and transmitting reference clock signals to each other daughter board, is connected at the most upstream position in said bus line among said plurality of connector elements;

all said plurality of connector elements to which said daughter boards are connected are installed in a row on the front face of said board and said connector element at the last stage to which said termination board is connected is installed on the rear face of said board and back-to-back on the rear side of said connector element positioned at the last part of said bus line out of said plurality of connector elements installed in a row on the front face of said board.

2. The motherboard according to claim 1 wherein said daughter boards and said termination board extend in a direction perpendicular to said motherboard to be connected to said connector elements and, said connector element to which said termination board is connected and said termination board being mirror-symmetrical with a daughter board and said connector element installed on the front face of said board and positioned at the last part of said bus line.

3. The motherboard according to claim 1 wherein said daughter boards extend in a direction perpendicular to said motherboard to be connected to said connector elements and said termination board extends in a direction parallel with said board to be connected to said connector elements and perpendicular to a connecting axis of said connector element to which said termination board is connected.