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. 25, 2002
Filed:
Mar. 01, 1999
Tan Nianxiong, Sollentuna, SE;
Johan Erlands, Linköping, SE;
Jacob Wikner, Link{overscore (o)}ping, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
A fully differential line driver, especially for twisted copper pairs. It includes two current amplifiers made in standard CMOS technique, each having an input and an output, the latter being connected via terminal resistors to a voltage source, which may be set to a larger voltage than that used for driving the CMOS amplifiers. Accordingly, a low output impedance can be combined with a large swing. Further, feedback is not necessary, avoiding problems like potential instability. A very low-impedance input makes it appropriate for connecting to a DAC, thus reducing distortion of its output signal. The driver is suitable for very-high-speed-digital-subscriber-line modems.