US 12,301,246 B2
Digital-to-analog converter calibration for audio amplifiers
Rie Sasakawa, Beaverton, OR (US); Donald Allen Pearce, Beaverton, OR (US); Wai Laing Lee, Portland, OR (US); and Miles Reuben Thompson, Portland, OR (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by SKYWORKS SOLUTIONS, INC., Irvine, CA (US)
Filed on Sep. 28, 2022, as Appl. No. 17/955,034.
Claims priority of provisional application 63/250,144, filed on Sep. 29, 2021.
Prior Publication US 2023/0096254 A1, Mar. 30, 2023
Int. Cl. H03M 1/00 (2006.01); H03M 1/10 (2006.01); H04R 1/10 (2006.01); H04R 3/04 (2006.01)
CPC H03M 1/1014 (2013.01) [H04R 1/1041 (2013.01); H04R 3/04 (2013.01); H04R 2201/028 (2013.01); H04R 2420/07 (2013.01); H04R 2430/01 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A calibration circuit comprising:
a first circuit configured to generate a first output voltage based on a first reference voltage, the first circuit including a comparator that compares a feedback voltage and the first reference voltage, and a bias circuit configured to provide the feedback voltage based on an output of the comparator, such that the first output voltage is approximately equal to the first reference voltage being provided to the comparator;
a second circuit configured to compare the first output voltage and a second reference voltage; and
a calibration block configured to provide an adjustment to the first circuit based on the comparison of the first output voltage and the second reference voltage, the adjustment configured to compensate for a change in the first reference voltage.