The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 2012
Filed:
Jul. 02, 2009
Tom Kwan, Cupertino, CA (US);
Sumant Ranganathan, Sunnyvale, CA (US);
Tom Kwan, Cupertino, CA (US);
Sumant Ranganathan, Sunnyvale, CA (US);
Broadcom Corporation, Irvine, CA (US);
Abstract
A second output transmission signal ('TX') added to a line driver is a scaled version of the main output transmission signal ('TX'). TXis scaled from TXby a variable scale factor K. An adaptive hybrid circuit subtracts TXand TXfrom a line signal carrying both a line transmission signal and a line received signal (“RX”). A programmable impedance Zis coupled between the TXoutput of the line driver and the RX output of the adaptive hybrid circuit. A transmission echo in the output RX signal is measured. K and Zare then adaptively tuned to minimize the transmission echo. The hybrid in this case becomes a 4-port network, one port specifically added to adaptively cancel the transmission echo in the RX output of the adaptive hybrid circuit. Alternatively, the hybrid may be a 3-port hybrid including variable impedances to cancel the line transmission signal.