# US 9,040,823 B2 · Low impedance boosted high speed data cable > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,040,823 B2 - Document ID: US9040823B2 - Status: Granted - Kind: B2 - Application number: 13/929,550 - Filed: 2013-06-27 - Published: 2013-10-31 - Granted: 2015-05-26 - Earliest claimed: 2010-07-13 - Applicants: Spectra7 Microsystems (Ireland) Limited - Inventors: John Martin Horan; Gerald Donal Murphy; David William McGowan; John Anthony Keane - Web page: https://patentgrep.com/patent/US9040823B2 ## CPC - H01B 11/00: Communication cables or conductors - H01R 13/00: Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 - H04B 3/00: Line transmission systems (combined with near-field transmission systems H04B5/00) - H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} - H04L 25/0272: {Arrangements for coupling to multiple lines, e.g. for differential transmission} - H04L 25/0278: {Arrangements for impedance matching} - H04L 25/03878: {Line equalisers; line build-out devices} - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A high speed video cable carries signals according to the High-Definition Multimedia Interface (HDMI) or DisplayPort standards, and includes a raw cable and a boost device. The raw cable includes coaxial lines of a characteristic cable impedance lower than the impedance implied in the standards. The correct impedance is observed at the sending end by series resistors mounted in the first cable connector. The resultant loss of signal is made up with the boost device mounted in the connector at the other end of the cable. ## Claims ### Claim 1 A data cable for carrying at least a first data signal between a data source device and a data sink device, the data cable comprising: a raw cable including at least a first cable element, the first cable element comprising at least a first conductor and a first conductive shield, the first cable element having a first cable element impedance lower than a data source device output impedance, wherein the first conductor is configured to carry at least a portion of the first data signal; a first padding resistor electrically coupled between the data source device and the first conductor; and a boost device coupling the first conductor with the data sink device, wherein a boost device input impedance matches the first cable element impedance and a boost device output impedance matches a data sink device input impedance. ### Claim 2 (depends on 1) The data cable of claim 1, wherein a sum of a first padding resistor impedance and the first cable element impedance matches the data source device output impedance. ### Claim 3 (depends on 1) The data cable of claim 1, wherein the boost device includes an amplifier to boost at least the first data signal. ### Claim 4 (depends on 1) The data cable of claim 1, wherein the boost device includes an equalizer to equalize at least the first data signal. ### Claim 5 (depends on 1) The data cable of claim 1, wherein the first data signal includes an analog signal. ### Claim 6 (depends on 1) The data cable of claim 1, wherein the first data signal includes a digital signal. ### Claim 7 (depends on 1) The data cable of claim 1, wherein the first data signal includes a video signal. ### Claim 8 (depends on 1) The data cable of claim 1, further comprising: a second conductor included in the first cable element; a second padding resistor electrically coupling the data source device with the second conductor; wherein the first data signal includes a differential signal, wherein the first and second conductors are configured to carry the differential signal; and wherein the boost device includes a common mode rejection circuit adapted to remove a common mode component from the differential signal. ### Claim 9 (depends on 8) The data cable of claim 8, wherein a combined impedance of the first and second padding resistors is substantially equal to a difference between the data source device output impedance and the first cable element impedance. ### Claim 10 (depends on 8) The data cable of claim 8, wherein the first and second padding resistors have equal impedances. ### Claim 11 (depends on 8) The data cable of claim 8, wherein the first cable element includes dual coaxial elements. ### Claim 12 (depends on 8) The data cable of claim 8, wherein the first and second conductors are dual shielded. ### Claim 13 (depends on 8) The data cable of claim 8, wherein the first cable element includes Shielded Twisted Pairs (STP). ### Claim 14 (depends on 8) The data cable of claim 8, further comprising a first circuit carrier connecting the data source device to the raw cable, the first circuit carrier including the first and second padding resistors. ### Claim 15 (depends on 14) The data cable of claim 14, further comprising a second circuit carrier including the boost device. ### Claim 16 (depends on 8) The data cable of claim 8, wherein the data cable conforms with the High-Definition Multimedia Interface (HDMI) standard. ### Claim 17 (depends on 8) The data cable of claim 8, wherein the data cable conforms with the DisplayPort standard. ### Claim 18 (depends on 8) The data cable of claim 8, wherein the first data signal includes a Transition Minimized Differential Signaling (TMDS) signal. ### Claim 19 (depends on 8) The data cable of claim 8, wherein the first data signal comprises a Main Line lane. ### Claim 20 (depends on 1) The data cable of claim 1, further comprising at least a first auxiliary conductor configured to carry at least a first auxiliary signal including at least one of the following: a Consumer Electronics Control (CEC), a Serial Clock (SCL), a Serial Data (SDA), a Digital Data Channel (DDC), a CONFIG1, a CONFIG2, a Hot Plug Detect (HPD), a DisplayPort power (DP-PWR), a CEC ground connection, a power connection, and a ground connection.