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:
Oct. 22, 2019
Filed:
Aug. 30, 2018
Qualcomm Incorporated, San Diego, CA (US);
Behnam Sedighi, La Jolla, CA (US);
Andrew Weil, San Diego, CA (US);
Nitz Saputra, Burlingame, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
The present disclosure describes aspects of segmented resistor architecture for digital-to-analog converters (DACs). In some aspects, a DAC circuit is implemented with a first resistor network coupled to a set of binary code-controlled current sources and a second resistor network that includes a resistor coupled between the first resistor network and an output of the DAC circuit. A set of thermometer code-controlled current sources are coupled to a node of the second resistor network and provide varying amounts of current. This current is scaled based on a resistance of the second resistor network's resistor, which is higher than a resistance of the first resistor network and effective to increase a combined output impedance of the first and second resistor networks. The increase of output impedance reduces noise of the resistor networks that transfers to the output of the DAC circuit, thereby improving signal-to-noise performance of the DAC circuit.