Transmission line system for printed circuits
First Claim
Patent Images
1. An integrated circuit (IC) transmission line comprising:
- a plurality of transmission line segments; and
at least one junction point to couple the plurality of transmission line segments, the plurality of transmission line segments and the at least one junction point comprising a predetermined topology wherein lengths of the plurality of transmission line segments are relative to a transition wavelength of a waveform in the IC transmission line, wherein the transition wavelength equals one of a rise time and a fall time of the waveform, times a propagation velocity of the waveform in the IC transmission line, times a constant of proportionality.
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Abstract
A branched transmission line, used for delivering control signals to integrated memory circuits. Memory circuits require control signals, which are delivered on control lines. If multiple memory circuits are involved, multiple control lines are used. If the multiple control lines branch from a common branch point on a supply line, undesirable reflections can occur. The invention reduces the reflections, by distributing the branching, as by starting with three initial branches, each of which branches into three other branches, in order to feed nine memory circuits.
8 Citations
14 Claims
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1. An integrated circuit (IC) transmission line comprising:
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a plurality of transmission line segments; and at least one junction point to couple the plurality of transmission line segments, the plurality of transmission line segments and the at least one junction point comprising a predetermined topology wherein lengths of the plurality of transmission line segments are relative to a transition wavelength of a waveform in the IC transmission line, wherein the transition wavelength equals one of a rise time and a fall time of the waveform, times a propagation velocity of the waveform in the IC transmission line, times a constant of proportionality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A printed circuit board comprising:
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a first layer; and a second layer, each of the first and second layers comprising an integrated circuit (IC) transmission line comprising a plurality of transmission line segments, and at least one junction point to couple the plurality of transmission line segments, the plurality of transmission line segments and the at least one junction point comprising a predetermined topology wherein lengths of the plurality of transmission line segments are relative to a transition wavelength of a waveform in the IC transmission line, wherein the transition wavelength equals one of a rise time and a fall time of the waveform, times a propagation velocity of the waveform in the IC transmission line, times a constant of proportionality.
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14. A method for designing an integrated circuit (IC) transmission line comprising:
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coupling a plurality of transmission line segments to at least one junction point according to a predetermined topology; and adjusting lengths of the plurality of transmission line segments relative to a transition wavelength of a waveform in the IC transmission line, wherein the transition wavelength equals one of a rise time and a fall time of the waveform, times a propagation velocity of the waveform in the IC transmission line, times a constant of proportionality.
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Specification