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:
Jul. 28, 2020
Filed:
Jun. 06, 2019
Analog Devices International Unlimited Company, Limerick, IE;
Jialin Zhao, Beijing, CN;
Matthew Louis Courcy, Freemont, NH (US);
Wenhua W. Yang, Lexington, MA (US);
Gerard E. Taylor, Laguna Niguel, CA (US);
ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANY, Limerick, IE;
Abstract
A DAC has a plurality DAC cells, and timing mismatch among the DAC cells can introduce errors in an output of a DAC. An efficient technique can be implemented to extract the timing error of a DAC cell. The technique involves a mixer to mix the timing error to DC (DC stands for direct current, where signal frequency is zero) and a VCO ADC to observe the output of the DAC cell to measure and extract the timing error. A first measurement is made using a first quadrature phase signal and a second measurement is made using a second quadrature phase signal. A difference between the first measurement and the second measurement yields the timing error of the DAC cell. Advantageously, the mixer can be integrated within a voltage-to-current converter of the VCO ADC. The timing error can be corrected in the digital domain or analog domain.