US 12,334,876 B2
Audio player device and startup method thereof
Cheng-Qi Huang, Shanghai (CN); Zhun Chen, Shanghai (CN); and Zhong-Yuan Wan, Shanghai (CN)
Assigned to SIGMASTAR TECHNOLOGY LTD., Fujian (CN)
Filed by SigmaStar Technology Ltd., Fujian (CN)
Filed on May 30, 2023, as Appl. No. 18/203,202.
Claims priority of application No. 202210716307.6 (CN), filed on Jun. 22, 2022.
Prior Publication US 2023/0421108 A1, Dec. 28, 2023
Int. Cl. H03F 1/26 (2006.01); H03F 3/183 (2006.01); H03M 1/66 (2006.01); H04R 3/00 (2006.01)
CPC H03F 1/26 (2013.01) [H03F 3/183 (2013.01); H03M 1/66 (2013.01); H04R 3/00 (2013.01); H03F 2200/03 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An audio player device, comprising:
a digital-to-analog converter (DAC), converting audio data into a first signal and a second signal;
a startup circuit, gradually increasing a level of a startup voltage according to a reference voltage during a predetermined period;
a multiplexer, outputting the startup voltage as a control voltage during the predetermined period, and switching to output the reference voltage as the control voltage after the predetermined period has elapsed; and
an output amplifier, generating an audio signal according to the control voltage, the first signal and the second signal, wherein the control voltage is used to set a common mode voltage of the output amplifier.