US 12,355,459 B2
Calibration of digital-to-analog converters
Gil Engel, Lexington, MA (US); and Paul S. Wilkins, Weston, MA (US)
Assigned to Analog Devices, Inc., Wilmington, MA (US)
Filed by Analog Devices, Inc., Wilmington, MA (US)
Filed on Feb. 17, 2023, as Appl. No. 18/171,197.
Claims priority of provisional application 63/314,614, filed on Feb. 28, 2022.
Prior Publication US 2023/0275596 A1, Aug. 31, 2023
Int. Cl. H03M 1/10 (2006.01)
CPC H03M 1/1009 (2013.01) 20 Claims
OG exemplary drawing
 
1. A method for measuring non-idealities of a DAC having a plurality of DAC cells and a plurality of redundant DAC cells whose outputs are summed to generate an analog output of the DAC, the method comprising:
providing digital data to the DAC cells to generate an output spectrum at the analog output of the DAC;
generating a first digitally-encoded calibration stimulus having a first fundamental energy at a first frequency bin;
scaling the first digitally-encoded calibration stimulus by a first weighting factor, and providing a first weighted calibration stimulus to a first subset of the redundant DAC cells to generate a first analog tone while the DAC cells generate the output spectrum;
scaling the first digitally-encoded calibration stimulus by a second weighting factor, and providing a second weighted calibration stimulus to a second subset of the redundant DAC cells to generate a second analog tone while the DAC cells generate the output spectrum, wherein the second weighting factor is selected to cause the first analog tone and the second analog tone to have opposite polarities; and
detecting, in the analog output of the DAC, an error tone at the first frequency bin resulting from the first analog tone and the second analog tone.