Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2006-04-25
2010-06-08
Tran, Anh Q (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S090000, C326S115000
Reexamination Certificate
active
07733128
ABSTRACT:
To provide a transmitting apparatus capable of suppressing the fluctuation of a common mode potential and performing high-speed, long-distance signal transmission. The transmitting apparatus has a main buffer circuit and a pre-emphasis buffer circuit20. The pre-emphasis buffer circuit20, which has a switch circuit21, a first current source22, and a second current source23, uses the switch circuit21to output a current signal having the same direction as an output current of the main buffer circuit10during a certain time interval starting from a time point when the level of data to be transmitted changes, and brings the output terminals201, 202to a High-Z state during a time interval when the level is constant after a lapse of the abovementioned certain time interval. The output of the pre-emphasis buffer circuit20has no influence on the common mode potential of the output of the main buffer circuit but has influence only the amplitude of the current signal output to a differential transmission line. In this manner, the transmitting apparatus can suppress the fluctuation of the common mode potential and can perform high-speed, long-distance signal transmission.
REFERENCES:
patent: 6281715 (2001-08-01), DeClue et al.
patent: 6940302 (2005-09-01), Shumarayev et al.
patent: 6977534 (2005-12-01), Radelinow
patent: 2002-368600 (2002-12-01), None
patent: 2004-112453 (2004-04-01), None
patent: 2004-312614 (2004-11-01), None
patent: 2004-357004 (2004-12-01), None
Sughrue & Mion, PLLC
Thine Electronics Inc.
Tran Anh Q
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