US 12,381,572 B2
Current digital-to-analog converter (DAC) with direct-current (DC) offset correction
Haibo Fei, San Diego, CA (US); Xiahan Zhou, San Diego, CA (US); Dongwon Seo, San Diego, CA (US); and Parisa Mahmoudidaryan, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jun. 15, 2023, as Appl. No. 18/335,663.
Prior Publication US 2024/0421828 A1, Dec. 19, 2024
Int. Cl. H03M 1/78 (2006.01); H03M 1/10 (2006.01); H03M 1/06 (2006.01); H03M 1/74 (2006.01)
CPC H03M 1/785 (2013.01) [H03M 1/1023 (2013.01); H03M 1/06 (2013.01); H03M 1/0617 (2013.01); H03M 1/74 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A digital-to-analog converter (DAC) circuit, comprising:
a decoder coupled to an input of the DAC circuit;
current-steering cells coupled to an output of the decoder, wherein outputs of the current-steering cells are coupled to a positive output node and a negative output node of the DAC circuit; and
an offset detection circuit comprising:
a comparator having a first input and a second input selectively coupled to the positive output node and the negative output node; and
a digital controller having an input coupled to an output of the comparator and an output coupled to the decoder; and
one or more calibration DACs coupled between the offset detection circuit and one or more of the current-steering cells.