Telephonic communications – Substation or terminal circuitry – Impedance matching or line equalizing
Reexamination Certificate
2007-05-15
2007-05-15
Tsang, Fan (Department: 2614)
Telephonic communications
Substation or terminal circuitry
Impedance matching or line equalizing
C379S398000
Reexamination Certificate
active
10749802
ABSTRACT:
A subscriber line interface circuit apparatus includes an impedance bridge coupled to a subscriber line. A first pair of current drivers is coupled to the impedance bridge for driving a voice signal in a first frequency range onto the subscriber line. A second pair of current drivers is coupled to the impedance bridge for driving a data signal in a second frequency range onto the subscriber line. The impedance bridge couples the second pair of current drivers to the subscriber line across an output impedance of Z1+Z2within the second frequency range.
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Davis William D.
Davis & Associates
Silicon Laboratories Inc.
Singh Ramnandan
Tsang Fan
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