US 12,445,154 B2
Wired transmitter with overvoltage protection
Zhong-Yuan Wan, Shanghai (CN); Zhun Chen, Shanghai (CN); and Jian-Feng Xue, Shanghai (CN)
Assigned to SIGMASTAR TECHNOLOGY LTD., Fujian (CN)
Filed by SigmaStar Technology Ltd., Fujian (CN)
Filed on Dec. 5, 2023, as Appl. No. 18/529,371.
Claims priority of application No. 202211650776.9 (CN), filed on Dec. 21, 2022.
Prior Publication US 2024/0214012 A1, Jun. 27, 2024
Int. Cl. H03M 1/66 (2006.01); H03K 17/081 (2006.01); H03K 17/687 (2006.01); H04B 1/04 (2006.01)
CPC H04B 1/04 (2013.01) [H03K 17/08104 (2013.01); H03K 17/687 (2013.01); H03M 1/66 (2013.01); H04B 2001/0408 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A wired transmitter, comprising:
a digital-to-analog converter (DAC) configured to generate a plurality of first output signals according to a digital code, wherein a first circuit in the DAC operates in a first voltage domain and a second circuit of the DAC operates in a second voltage domain, and an upper limit of the first voltage domain is lower than an upper limit of the second voltage domain; and
a line driver configured to operate in the second voltage domain, and generate a plurality of second output signals according to the first output signals, wherein each of the DAC and the line driver is implemented by a plurality of transistors corresponding to the first voltage domain,
wherein the second circuit transmits a predetermined voltage to a power supply node in a first mode to provide the DAC with an overvoltage protection, and the DAC is driven by a level of the power supply node in a second mode.