Trace-pad interface for improved signal quality
First Claim
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1. The apparatus for a signal-triggered digital circuit, said apparatus comprising:
- a signal source for generating a digital signal;
an input receiver, said input receiver receiving said digital signal for said digital circuit and being responsive to triggering induced by said digital signal;
a conducting interface;
a conducting signal path, said conducting signal path being electrically connected to said conducting interface at a corner thereof, said conducting interface being electrically connected to said input receiver, said signal path carrying said digital signal thereover, said conducting signal path having a length which is at least ⅙
th of a transition electrical length of said digital signal carried thereover, said transition electrical length constituting a transient time of said digital signal multiplied by a propagation speed of said digital signal over said conducting signal path, and wherein said transient time of the said digital signal is selected from a group comprising a rise time thereof and a fall time thereof; and
wherein said conducting interface is substantially rectangular in planar view and said conducting signal path connected thereto as aforesaid has a longitudinal centerline axis which forms an angle in a range of 110 to 160 degrees with respect to a side of said conducting interface to which said conducting signal path is connected to thereby produce a reduced reflection of said digital signal at said connection between said conducting interface and said conducting signal path when compared to a connection wherein said angle has a value of 90 degrees.
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Abstract
A method of routing or laying out signal traces on printed wire or circuit board in order to improve signal transmission quality. The method includes routing a given signal trace such that it is electrically connected to a rectangular corner of a substantially wider component pin pad and forms an angle of approximately 135 degrees with the proximate sides of the pad, thereby minimizing the impedance discontinuity at the interface or junction of the signal trace and pad and hence minimizing the reflection of the digital signal at the interface or junction.
13 Citations
42 Claims
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1. The apparatus for a signal-triggered digital circuit, said apparatus comprising:
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a signal source for generating a digital signal; an input receiver, said input receiver receiving said digital signal for said digital circuit and being responsive to triggering induced by said digital signal; a conducting interface; a conducting signal path, said conducting signal path being electrically connected to said conducting interface at a corner thereof, said conducting interface being electrically connected to said input receiver, said signal path carrying said digital signal thereover, said conducting signal path having a length which is at least ⅙
th of a transition electrical length of said digital signal carried thereover, said transition electrical length constituting a transient time of said digital signal multiplied by a propagation speed of said digital signal over said conducting signal path, and wherein said transient time of the said digital signal is selected from a group comprising a rise time thereof and a fall time thereof; andwherein said conducting interface is substantially rectangular in planar view and said conducting signal path connected thereto as aforesaid has a longitudinal centerline axis which forms an angle in a range of 110 to 160 degrees with respect to a side of said conducting interface to which said conducting signal path is connected to thereby produce a reduced reflection of said digital signal at said connection between said conducting interface and said conducting signal path when compared to a connection wherein said angle has a value of 90 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. The circuit substrate for a signal-triggered digital circuit, said circuit substrate comprising:
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a conducting interface, substantially rectangular in planar view, for electrical connection to an input receiver, said input receiver receiving a digital signal over said digital circuit and being responsive to triggering induced by said digital signal; a conducting signal path having a width which is ⅕
th of a width of said conducting interface, said conducting signal path being connected to said conducting interface, said signal path carrying said digital signal thereover, said conducting signal path having a thickness which is in a range of ⅕
th to ⅙
th of a thickness of the conducting interface to which said conducting signal path is connected; andwherein said conducting signal path connected to said conducting interface has a longitudinal centerline axis which forms an angle in a range of 110 to 160 degrees with respect to a side of the conducting interface to which said conducting signal path is connected to thereby produce a reduced reflection of said digital signal at said connection between said conducting interface and said conducting signal path when compared to a connection wherein said angle has a value of 90 degrees. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. The apparatus for a signal-triggered digital circuit of a memory system device, said apparatus comprising:
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a memory controller signal source for generating a digital control signal; an input receiver located within said memory device, said input receiver receiving said digital signal for said digital circuit and being responsive to triggering induced by said digital signal; a conducting inter face; a conducting signal path, said conducting signal path being electrically connected to said conducting interface at a corner thereof said conducting interface being electrically connected to said input receiver, said signal path carrying said digital signal thereover, said conducting signal path having a length which is at least ⅙
th of a transition electrical length of said digital signal carried thereover, said transition electrical length constituting a transient time of said digital signal multiplied by a propagation speed of said digital signal over said conducting signal path, said transient time of the said digital signal being selected from a group comprising a rise time thereof and a fall time thereof; andwherein said conducting interface is substantially rectangular in planar view and said conducting signal path connected thereto as aforesaid has a longitudinal centerline axis which forms an angle in a range of 110 to 160 degrees with respect to a side of said conducting interface to which said conducting signal path is connected to thereby produce a reduced reflection of said digital signal at said connection between said conducting interface and said conducting signal path when compared to a connection wherein said angle has a value of 90 degrees. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. The circuit substrate for a signal-triggered memory device digital circuit, said circuit substrate comprising:
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a conducting interface, substantially rectangular in planar view, for electrical connection to an input receiver of the memory device, said input receiver receiving a digital control signal over said digital circuit and being responsive to triggering induced by said digital control signal; a conducting signal path having a width which is ⅕
th of a width of said conducting interface, said conducting signal path being connected to said conducting interface, said signal path carrying said digital control signal thereover, said conducting signal path having a thickness which is in the range of ⅕
th to ⅙
th of a thickness of the conducting interface to which said conducting signal path is connected; andwherein said conducting path connected to said conducting interface has a longitudinal centerline axis which forms an angle in a range of 110 to 160 degrees with respect to a side of the conducting interface to which said path is connected to thereby produce a reduced reflection of said digital control signal at said connection between said conducting interface and said conducting path when compared to a connection wherein said angle has a value of 90 degrees. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification