Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Reexamination Certificate
2011-04-12
2011-04-12
Barnie, Rexford N (Department: 2819)
Telephonic communications
Subscriber line or transmission line interface
Hybrid circuit
C379S399010, C379S402000
Reexamination Certificate
active
07925005
ABSTRACT:
A method of calibrating longitudinal balance for a subscriber line interface circuit includes providing a first and a second driver of a differential driver pair for driving a subscriber line. An output of each of the first and second drivers is coupled to a common output. The common output is coupled to an input of the first driver. The gain of at least one of the first and second drivers is adjusted until a calibration signal (V1) present at the input of the first driver is substantially the same as a calibration signal (V2) present at the input of the second driver.
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Goldenberg Marius
Hendrickson Alan F.
Mills Michael J.
Tesu Ion C.
Yi Jiangtao
Barnie Rexford N
Davis William D.
Davis & Associates
Silicon Laboratories Inc.
Tabler Matthew C
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