Connection system for integrated circuits which reduces cross-talk
AssigneeNCR Corporation
InventorHarold S. Crafts
Life of this patent
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Abstract
The invention concerns a Multi-Chip Module (MCM), which can be viewed as similar to a printed circuit board, but with the conductors interwoven in a 3-dimensional array. In the invention, the conductors are arranged such that both power supply conductors and ground conductors are interwoven around signal conductors, and provide shielding for the signal conductors, thus reducing cross-talk.
Claims8
In a carrier for supporting integrated circuits, which includes conductive traces which carry signals, the improvement comprising:
- a) several conductors which
- i) are interspersed among the traces,
- ii) are held at substantially constant dc potential, and
- iii) together with said conductive traces, occupy no more than two layers.
A carrier for integrated circuits, comprising:
- a) no more than two layers of conductors;
- and
- b) interconnections among the conductors such that
- i) some conductors can be used as signal conductors, and
- ii) other conductors can be used as power conductors which shield the signal conductors from each other.
A carrier for integrated circuits (ICs), comprising:
- a) a plurality of signal lines for carrying signals to and from the ICs and located on no more than two levels;
- b) for each signal line, a pair of conductors which
- i) flank the signal line and
- ii) carry power to ICs.
A carrier for integrated circuits (ICs), comprising:
- a) a substrate;
- b) a positive and a negative power supply grid, which together form a periodic array of unit cells;
- and
- c) signal traces interwoven through the periodic array, and connecting to the ICs.
An electronic device, comprising:
- a) several integrated circuits (ICs);
- and
- b) a carrier supporting the ICs;
- in which substantially all signal lines
- i) are supported by the carrier;
- and
- ii) have substantially constant characteristic impedance along their respective lengths.
An electronic device, comprising:
- a) several integrated circuits (ICs);
- and
- b) a carrier supporting the ICs;
- in which substantially all signal lines
- i) are supported by the carrier;
- ii) have substantially constant characteristic impedance along their respective lengths;
- and
- iii) have substantially identical characteristic impedances.
In a carrier for integrated circuits (ICs), a system for carrying signals between an entry port on the carrier and the ICs, comprising:
- a) a periodic array of substantially identical cells;
- and
- b) a network of signal lines interwoven through the cells.
In a carrier for integrated circuits (ICs), a system for carrying signals between an entry port on the carrier and the ICs, comprising:
- a) no more than two layers of conductive signal traces, interconnected to form
- i) a network of signal lines for interconnecting the ICs;
- and
- ii) a network of power lines, which deliver all power required by the ICs.
Dependencies are inferred from the claim text.