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. 17, 2003
Filed:
Aug. 27, 1999
Frode Larsen, Tinton Falls, NJ (US);
GlobespanVirata, Inc., Red Bank, NJ (US);
Abstract
In general, the line driver is defined by an input and output stage wherein the input stage is identified by the deriving of the open loop gain of a preamplifier and the output stage is defined by the deriving of the open loop gain of two drivers that provide power required for the line driver to drive a line. Both, the preamplifier and the drivers have inputs that sit at a common mode voltage, thereby inhibiting a common mode input voltage swing and limiting distortion in the line driver. The gain of the preamplifier may be changed to a desired value by regulating the values of resistors therein, thereby reducing distortion by maximizing the open loop gain for all lines and DSL applications. The line driver can be configured for any desired closed loop gain, regardless of whether the gain value is below or above 1. The drivers of the, output stage use a set of programmable output devices to allow for maximum drive capability of the drivers to be programmed under digital control. Digital programmability of the output drive allows the line driver to be reconfigured by digital control, so as to provide for the driving of the twisted pair, regardless of unexpected impedances, such as a bridge tap.