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:
Dec. 30, 2014
Filed:
Mar. 26, 2013
Broadcom Corporation, Irvine, CA (US);
Hui Zheng, Irvine, CA (US);
Sasi Kumar Arunachalam, Irvine, CA (US);
Alex Jianzhong Chen, Irvine, CA (US);
Aravind Kumar Padyana, Irvine, CA (US);
I-Ning Ku, Los Angeles, CA (US);
Jungwoo Song, Irvine, CA (US);
Xicheng Jiang, Irvine, CA (US);
Broadcom Corporation, Irvine, CA (US);
Abstract
A multi-mode line driver circuit designed to be fabricated in a CMOS process and capable of supporting a plurality of operating modes corresponding, for example, to different profiles of communication standards such as xDSL standards. The line driver circuit incorporates integrated mode switches with a two-stage amplifier architecture to relax amplifier requirements by distributing the signal gain into two amplifier stages. Reconfigurable feedback loops are provided to permit design optimization for particular modes of operation (e.g., ADSL and VDSL compliant modes). In one embodiment implemented as a Class-H amplifier, lift amplifier(s) are provided between a first amplifier stage and a second amplifier stage for controlling voltage supply levels of the second amplifier stage. The lift amplifiers may be enabled by voltage threshold detection circuitry that monitors either the input or the output signals of the first amplifier stage depending on the operable transmission mode.