Reduction of aggregate EMI emissions of multiple transmitters

Details Reduction of aggregate EMI emissions of multiple transmitters Reduction of aggregate EMI emissions of multiple transmitters

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.

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