Pulse or digital communications – Cable systems and components
Reexamination Certificate
2007-12-04
2007-12-04
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Cable systems and components
C341S144000
Reexamination Certificate
active
11204627
ABSTRACT:
A power efficient and reduced electromagnetic interference (EMI) emissions transmitter for unshielded twisted pair (UTP) data communication applications. Transmit data is processed by a digital filter. The digital filter output data is converted to a current-mode analog waveform by a digital-to-analog converter (DAC). The digital filter is integrated with the DAC binaiy decoder in a memory device such as a ROM with time multiplexed output. DAC line driver cells are adaptively configurable to operate in either a class-A or class-B mode depending on the desired operational modality. A discrete-time analog filter is integrated with the DAC line driver to provide additional EMI emissions suppression. An adaptive electronic transmission signal cancellation circuit separates transmit data from receive data in a bidirectional communication system operating in full duplex mode. For a multi-transmitter system, timing circuitry staggers the time base of each transmitter to reduce the aggregate EMI emissions of the multi-transmitter system.
REFERENCES:
patent: 5506537 (1996-04-01), Kimura
patent: 6028479 (2000-02-01), Babanezhad
patent: 6762625 (2004-07-01), Devnath
Bocure Tesfaldet
Broadcom Corporation
McAndrews Held & Malloy Ltd.
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