Transmission system and method for constructing backplane system

Patent metadata

Field	Value
Publication number	US-9397418-B2
Application number	US-201214008422-A
Country	US
Kind code	B2
Filing date	Mar 30, 2012
Priority date	Mar 30, 2011
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

The present invention provides a system and a method which enable an increase in signal transmission speed and stable operation, without incurring the likes of restrictions on the manufacturing of circuit boards. A transmission system includes an AC terminal connector, having an AC termination circuit including a resistor and a capacitor, at the open ends of through hole stubs provided in a circuit board.

First claim

The invention claimed us:

1. A transmission system comprising:
an equalizer with a frequency characteristic inversed to a transmission characteristic of a transmission line on which a signal is transmitted and from which the equalizer receives the signal, the equalizer performing waveform shaping of the received signal to allow for discrimination of a logical level of the signal by enlarging or reducing an amplitude of the signal in correspondence with a pulse width of the signal;
a circuit board constituting the transmission line; and
an AC termination connector connected to an open end of a stub of a through-hole provided in the circuit board, the AC termination connector including
an AC termination circuit including a resistor and a capacitor, the AC termination circuit being configured to suppress a resonant oscillation of the stub in the through-hole to prevent a non-uniform waveform propagation to the equalizer due to the resonant oscillation of the stub.

2. A transmission system, comprising:
a circuit board; and
an AC termination connector connected to an open end of a stub of a through-hole provided in the circuit board, the AC termination connector including
an AC termination circuit including a resistor and a capacitor,

wherein the through-hole includes:
first and second through-holes configured to differentially transmit a signal, first and second connector terminals being inserted from one surface side of the circuit board into the first and second through-holes, respectively, and
wherein the AC termination connector comprises
a first AC termination connector including:
third and fourth connector terminals inserted, opposing respectively to the first and second connector terminals, into the first and second through-holes in a surface opposite to the one surface side of the circuit board; and

a first AC termination circuit including
a series circuit including the resistor and the capacitor and being connected between the third and fourth connector terminals.

3. The transmission system according to claim 2 , wherein the circuit board is a backplane, and
the first and second connector terminals are connector terminals of a backplane connector connected to the first and second through-holes provided in the backplane.

4. The transmission system according to claim 3 , wherein the AC termination connector includes
a second AC termination connector including
a third AC termination circuit including
a series circuit including a resistor and a capacitor and being connected to an open end of a stub of a through-hole provided in a daughter card installed on the backplane with the backplane connector.

5. The transmission system according to claim 4 , wherein the daughter card includes
first and second through-holes to differentially transmit signal, the first and second connector terminals of the backplane connector being inserted from one surface side of the daughter card into the first and second through-holes, respectively, and
wherein the second AC termination connector includes:
third and fourth connector terminals inserted, opposing respectively to the first and second connector terminals, into the first and second through-holes in a surface opposite to the one surface side of the daughter card, and
a third AC termination circuit including
a series circuit including the resistor and the capacitor and being connected between the third and fourth connector terminals.

6. The transmission system according to claim 4 , wherein the daughter card includes
first and second through-holes configured to differentially transmit a signal, the first and second connector terminals of the backplane connector being inserted from the one surface side of the daughter card into the first and second through-holes, respectively, and
wherein the second AC termination connector includes:
third and fourth connector terminals inserted, opposing respectively to the first and second connector terminals, into the first and second through-holes in a surface opposite to the one surface side of the circuit board;

the third AC termination circuit including
a series circuit including a first resistor and a first capacitor and being connected between the third connector terminal and the ground; and

a fourth AC termination circuit including
a series circuit including a second resistor and a second capacitor and being connected between the fourth connector terminal and the ground.

7. A transmission system, comprising:
a circuit board; and
an AC termination connector connected to an open end of a stub of a through-hole provided in the circuit board, the AC termination connector including
an AC termination circuit including a resistor and a capacitor,

wherein the through-hole includes
first and second through-holes to differentially transmit a signal, and
first and second connector terminals being inserted from one surface side of the circuit board into the first and second through-holes, respectively, and
wherein the AC termination connector comprises
a first AC termination connector including
third and fourth connector terminals inserted, opposing respectively with the first and second connector terminals, into the first and second through-holes in a surface opposite to the one surface side of the circuit board;

a first AC termination circuit including
a series circuit including a first resistor and a first capacitor and being connected between the third connector terminal and the ground; and

a second AC termination circuit including
a series circuit including a second resistor and a second capacitor and being connected between the fourth connector terminal and the ground.

8. The transmission system according to claim 7 , wherein the circuit board is a backplane, and
the first and second connector terminals are connector terminals of a backplane connector connected to the first and second through-holes provided in the backplane.

9. A transmission system, comprising:
a circuit board;
an AC termination connector connected to an open end of a stub of a through-hole provided in the circuit board, the AC termination connector including
an AC termination circuit including a resistor and a capacitor;

a first semiconductor chip including an output buffer configured to differentially output a signal;
a first daughter card including thereon the first semiconductor chip and connected thereto;
a first backplane connector configured to install the first daughter card on the backplane;
a second semiconductor chip including an input buffer configured to differentially receive a signal;
a second daughter card including thereon the second semiconductor chip and connected thereto;
a second backplane connector configured to install the second daughter card on the backplane; and
a backplane including the circuit board,
wherein the AC termination connector includes
first and second AC termination connectors respectively including first and second AC termination circuits, each including a series circuit including a resistor and a capacitor,

first and second connector terminals of the first backplane connector being inserted from one surface side of the backplane into first and second through-holes differentially transmitting a signal,
first and second connector terminals of the second backplane connector being inserted from one surface side of the backplane into third and fourth through-holes differentially transmitting a signal,
wherein the first AC termination connector includes
third and fourth connector terminals inserted, opposing respectively to the first and second connector terminals of the first backplane connector, into the first and second through-holes in a surface opposi

Assignees

• Kashiwakura Kazuhiro
• Nec Corp

Inventors

• Kashiwakura Kazuhiro

Classifications

• H05K2201/10295

  Metallic connector elements partly mounted in a hole of the PCB · CPC title

• H05K2201/044

  Details of backplane or midplane for mounting orthogonal PCBs · CPC title

• H01R23/7073

  Electricity · mapped topic

• H04L25/0298 Primary

  Arrangement for terminating transmission lines · CPC title

• H05K1/0243

  Printed circuits associated with mounted high frequency components · CPC title