US 11,728,822 B2
Digital amplitude tracking current steering digital-to-analog converter
Shahin Mehdizad Taleie, San Diego, CA (US); Dongwon Seo, San Diego, CA (US); Ashok Swaminathan, Cardiff, CA (US); Gurkanwal Singh Sahota, San Diego, CA (US); Andrew Weil, San Diego, CA (US); and Haibo Fei, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jun. 28, 2021, as Appl. No. 17/359,918.
Prior Publication US 2022/0416804 A1, Dec. 29, 2022
Int. Cl. H03M 1/74 (2006.01); H03M 1/46 (2006.01); H03M 1/50 (2006.01); H03M 1/78 (2006.01); H03M 1/00 (2006.01); H03M 1/12 (2006.01)
CPC H03M 1/747 (2013.01) [H03M 1/002 (2013.01); H03M 1/1295 (2013.01); H03M 1/466 (2013.01); H03M 1/502 (2013.01); H03M 1/742 (2013.01); H03M 1/785 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A digital-to-analog converter (DAC) system, comprising:
a plurality of current steering cells, each comprising a current source coupled to at least two current steering switches, wherein control inputs of the at least two current steering switches are coupled to an input path of the DAC system;
a current source toggle circuit configured to selectively disable the current source of at least one of the plurality of current steering cells; and
a feedforward path coupled between the input path and at least one control input of the current source toggle circuit, wherein the input path comprises one or more digital processing circuits coupled between an input node of the DAC system and the control inputs of the at least two current steering switches, wherein the feedforward path comprises a control circuit coupled between the input node and the at least one control input of the current source toggle circuit, and wherein a delay associated with the one or more digital processing circuits is greater than a delay associated with the control circuit.