US 12,003,249 B2
Digital-to-analog conversion circuit and method having signal calibration mechanism
Kai-Yue Lin, Hsinchu (TW); Hsuan-Ting Ho, Hsinchu (TW); Liang-Wei Huang, Hsinchu (TW); and Chi-Hsi Su, Hsinchu (TW)
Assigned to REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed by REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed on Jul. 11, 2022, as Appl. No. 17/861,393.
Claims priority of application No. 110125698 (TW), filed on Jul. 13, 2021.
Prior Publication US 2023/0036760 A1, Feb. 2, 2023
Int. Cl. H03M 1/10 (2006.01); H03M 1/66 (2006.01); H03M 1/74 (2006.01)
CPC H03M 1/1023 (2013.01) [H03M 1/10 (2013.01); H03M 1/66 (2013.01); H03M 1/742 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A digital-to-analog conversion (DAC) circuit having signal calibration mechanism, comprising:
a plurality of thermometer-controlled current sources configured to generate an output analog signal according to a total current; and
a control circuit configured to retrieve a plurality of current offset values that the thermometer-controlled current sources correspond to and perform a sorting procedure on the current offset values to generate a turn-on order, wherein the current offset values are separated into a plurality of current offset groups according to the turn-on order, in which signs of each neighboring two of the current offset groups are opposite such that the current offset values cancel each other when the current sources turn on according to the turn-on order to keep an absolute value of a total current offset value of the current offset values not larger than a half of a largest absolute value;
wherein the control circuit is further configured to control the current sources to turn on based on the turn-on order according to a plurality of thermal codes comprised by an input digital signal.