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:
Mar. 05, 2019
Filed:
Jul. 04, 2018
Realtek Semiconductor Corp., HsinChu, TW;
Yi-Shao Chang, Kaohsiung, TW;
Ka-Un Chan, Hsinchu County, TW;
Realtek Semiconductor Corp., HsinChu, TW;
Abstract
A DC offset calibration circuit for calibrating DC offset with multi-level method includes analog DC offset cancellation unit and digital DC offset cancellation unit, wherein analog DC offset cancellation unit includes first amplifier and integrator, first amplifier receives analog signal with DC offset, and transmits to integrator, and integrator transmits first feedback signal to first amplifier to output amplified signal with fixed DC offset, and digital DC offset cancellation unit includes comparator, digital circuit, digital-to-analog converter and second amplifier, where second amplifier receives amplified signal with fixed DC offset and transmits to comparator for determining DC offset value and transmitting to digital circuit, digital circuit generates logical result according to DC offset value and transmits to digital-to-analog converter, and therefore digital-to-analog converter accordingly generates second feedback signal to second amplifier, to calibrate DC offset value on second amplifier.