US 12,126,350 B2
Digital-to-analog converter and operation method thereof
Ting-Hao Wang, Hsinchu (TW); Hui-Wen Tsai, Hsinchu (TW); and Shih-Chun Lo, Hsinchu (TW)
Assigned to Global Unichip Corporation, Hsinchu (TW); and Taiwan Semiconductor Manufacturing Company, Ltd., Hsinchu (TW)
Filed by Global Unichip Corporation, Hsinchu (TW); and Taiwan Semiconductor Manufacturing Company, Ltd., Hsinchu (TW)
Filed on Nov. 21, 2022, as Appl. No. 17/990,737.
Claims priority of application No. 111131833 (TW), filed on Aug. 24, 2022.
Prior Publication US 2024/0072816 A1, Feb. 29, 2024
Int. Cl. H03M 1/66 (2006.01); H03M 1/06 (2006.01)
CPC H03M 1/0604 (2013.01) 22 Claims
OG exemplary drawing
 
1. A digital-to-analog converter, comprising:
a current source module;
a decoder, coupled to the current source module and receiving a digital input signal;
a change indicator, coupled to the decoder and providing an indication signal to the decoder; and
a random number generator, coupled to the change indicator and providing a random number signal to the change indicator,
wherein the change indicator generates the indication signal according to the random number signal, and the decoder generates a control signal to the current source module according to the digital input signal and the indication signal, so that the current source module generates an analog output signal corresponding to the digital input signal according to the control signal,
wherein the change indicator further adds a dummy bit to the indication signal, the dummy bit is located one bit before a bit position indicated by a code of the digital input signal, and the dummy bit is set to a value 0.