Method and system for providing an analog front end for multiline transmission in communication systems
US7796544B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 2003 |
| Grant date | Sep 14, 2010 |
| Priority date | — |
| Expiry date | May 15, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03598
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and system for providing an analog front end for multiline transmission in communications systems are described. A transceiver circuit (1100) is configured to reduce line noise by providing a coupled transmitter (1106), receiver (1106), prebalance circuit (1110), and transformer (1220) further coupled to a communication line (1264) external to the transceiver circuit. A hybrid (HY) input stage (1204) coupled to the prebalance circuit provides high frequency compensation by including a first high pass circuit coupled to the HY stage inputs, wherein the high pass circuit includes two parallel passes, each with a capacitor (C1,C5) in series with a resistor (R9,R10). A receiver input stage (RX) (RX) (1206) further coupled to the prebalance circuit provides low frequency compensation by including a second high pass circuit coupled to the RX stage inputs, wherein the high pass circuit includes two parallel passes, one with a capacitor (C3) and one with a capacitor (C7) in series with a resistor (R13). Lastly, a summing junction (1208) coupled to the HY stage (1204) and RX stage (1206) subtracts the HY stage output from the RX stage output providing a filtered incoming analog sig…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.