Pulse or digital communications – Transmitters
Reexamination Certificate
2007-03-28
2009-02-10
Barnie, Rexford (Department: 2819)
Pulse or digital communications
Transmitters
C326S029000, C326S086000
Reexamination Certificate
active
07489738
ABSTRACT:
A signal transmission system is provided which is capable of simplifying circuits and shortening time required for automatic adjustment of pre-emphasis. A signal having a single pulse pattern is generated by a single pulse pattern generating circuit. A signal having passed through a selector is divided into two signals whose phases are inverted and which are transmitted to a receiving circuit. An eye aperture of an eye waveform in a direction of time is measured by an eye aperture judging section by using the two signals and a sampling clock output from a sampling clock controlling section. An adjustment controlling section compares the measured eye aperture with a target value for judgment and transmits the judgment result to the transmitting circuit, where pre-emphasis is adjusted based on the judgment result.
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patent: 2004/0061922 (2004-04-01), Mauro et al.
patent: 2005/0057280 (2005-03-01), Groen et al.
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patent: 2005-094172 (2005-04-01), None
Barnie Rexford
McGinn IP Law Group PLLC
NEC Corporation
White Dylan
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