Impedance synthesis and DC biasing method and architecture for DSL/cable line drivers
November 29, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDigital two-to-four wire converter for full duplex signals Apparatus for transmitting and/or receiving balanced signals on a two-wire telecommunication line Active symmetrical balance hybrid circuit Circuit for maintaining hybrid cancellation of signals in a communication system Side tone correction circuit Autoequalizing bidirectional-to-unidirectional hybrid network Battery feed for telephone line cards Interface circuit between a four wire line and a two wire line Two port signalling voltages filter arrangement System and method for transmission system automatic impedance matching InventorAssigneeApplicationNo. 725623 filed on 11/29/2000US Classes:330/69, SUM AND DIFFERENCE AMPLIFIERS330/146, WHEATSTONE BRIDGE WITH AMPLIFIER IN AT LEAST ONE ARM379/391, Sidetone control or hybrid circuit (e.g., induction coil)379/399.01, SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE379/402Hybrid circuitExaminersPrimary: Shingleton, Michael BAttorney, Agent or FirmInternational ClassesH04M 001/00H04M 009/00 AbstractA low noise, low distortion, power efficient DSL/cable line driver has a double Wheatstone impedance bridge network that functions to prevent contamination of DSL signals that are received by and transmitted from the line driver. The line driver employs an external current sensing impedance that can be either purely resistive or complex and that can be selected to accommodate a particular transmission medium. The line driver further employs an internal programmable resistor that can be programmably adjusted to accommodate changes in transmission medium impedance to optimize sidetone rejection. | |
