Pulse or digital communications – Cable systems and components
Reexamination Certificate
2005-08-16
2005-08-16
Burd, Kevin (Department: 2631)
Pulse or digital communications
Cable systems and components
Reexamination Certificate
active
06931073
ABSTRACT:
A power efficient and reduced electromagnetic interference (EMI) emissions multi-transmitter system for unshielded twisted pair (UTP) data communication applications. For each transmitter, digital transmit data is converted to a current-mode differential signal analog waveform by a digital-to-analog converter (DAC). The output current from each DAC is used to generate the required transmit voltage on the respective UTP line. Timing circuitry staggers the time base of each transmitter to reduce the aggregate EMI emissions of the multi-transmitter system.
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Hatamain et al, Design Considerations for Gigabit Ethernet 1000Base-T Twisted Pair Transceivers, May 1998, Custom Integrated Circuits Conference, 355-342.
Broadcom Corporation
Burd Kevin
McAndrews Held & Malloy Ltd.
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