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:
Aug. 17, 2004
Filed:
Jan. 08, 2003
Petri Eloranta, Espoo, FI;
Nokia Corporation, Espoo, FI;
Abstract
The invention relates to a digital-to-analog converter. In order to reduce distortion in the output, the converter comprises a first and a second current output (OUT, XOUT), at least two current sources ( ) and assigned to each of the current sources ( ) a current switch circuit. Each current switch circuit comprises means ( ) for creating two overlapping complementary control signals out of a signal indicating whether the current source ( ) is selected, while in a first group of the current switch circuits the connection of the current source ( ) to the current outputs is controlled by one of the control signals respectively, and while in a second group of the current switch circuits the control by the control signals is exchanged, each of the current switch circuits of the second group comprising in addition means ( ) for inverting the signal input to the means for creating two overlapping complementary control signal ( ).