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. 09, 2005
Filed:
Mar. 31, 2004
Jerzy A. Teterwak, Colorado Springs, CO (US);
Jerzy A. Teterwak, Colorado Springs, CO (US);
Maxim Integrated Products, Inc., Sunnyvale, CA (US);
Abstract
A current steering digital-to-analog (DAC) having improved dynamic performance and output signal quality (i.e. improved SFDR characteristic). The DAC includes current steering segments each having differential transistors to steer a current from a summing node to either the positive or negative output. The DAC further comprises a control circuit to reduce the variation of the voltage present at each summing node. More specifically, the control circuit includes a first circuit that controls the threshold voltage of the corresponding differential transistors that are electrically connected to the positive output in response to the sensed positive output voltage such that the voltages at the corresponding summing nodes remain constant. Similarly, the control circuit includes a second circuit that controls the threshold voltage of the differential transistors that are electrically connected to the negative output in response to the sensed negative output voltage such that the voltages of the corresponding summing nodes remain constant.