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. 14, 2025
Filed:
Jan. 26, 2024
Qualcomm Incorporated, San Diego, CA (US);
Xiaopeng Zhong, Seattle, WA (US);
Yuhua Guo, San Diego, CA (US);
Chieh-Yu Hsieh, Irvine, CA (US);
Chienchung Yang, San Diego, CA (US);
QUALCOMM INCORPORATED, San Diego, CA (US);
Abstract
A sigma-delta analog-to-digital converter is provided that includes an initial continuous-time integration stage having a variable input resistor and an integration capacitor. A switched-capacitor circuit charges and discharges a replica capacitor to a reference voltage to generate a bias current. A SAR-based tuning circuit includes a variable tuning resistor that generates a tuning voltage while conducting a mirrored version of the bias current. A resistance of the variable input resistor is adjusted responsive to a tuning code from the SAR-based tuning circuit.