US 12,323,117 B2
Post driver having voltage protection
Yin-Yin Gu, Shanghai (CN); Ze-Wei He, Shanghai (CN); Zhao-Qi Xu, Shanghai (CN); and Kai Sun, Shanghai (CN)
Assigned to SIGMASTAR TECHNOLOGY LTD., Fujian (CN)
Filed by SigmaStar Technology Ltd., Fuijan (CN)
Filed on Aug. 30, 2022, as Appl. No. 17/899,020.
Claims priority of application No. 202111639944.X (CN), filed on Dec. 29, 2021.
Prior Publication US 2023/0208371 A1, Jun. 29, 2023
Int. Cl. H03F 3/45 (2006.01); H03F 1/52 (2006.01)
CPC H03F 3/45654 (2013.01) [H03F 1/523 (2013.01); H03F 3/45183 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A post driver, comprising:
an input pair circuit, outputting a first signal through a first node and outputting a second signal through a second node according to a first input signal and a second input signal;
a protection circuit, providing the input pair circuit with voltage protection according to a plurality of first bias voltages and a second bias voltage, transmitting the first signal to a first load to generate a first output signal, and transmitting the second signal to a second load to generate a second output signal;
a common mode sensing circuit, sensing a level of the first node and a level of the second node to generate a feedback signal;
an amplifier, generating the second bias voltage according to a reference voltage and the feedback signal; and
a switching circuit, selectively outputting one of the second bias voltage and a fixed voltage to the protection circuit.