US 12,334,920 B2
Level shifter
Jung-Tsun Chuang, Tainan (TW); Shao-Chang Huang, Hsinchu (TW); Li-Fan Chen, Hsinchu (TW); Chun-Chih Chen, New Taipei (TW); Gong-Kai Lin, Yilan County (TW); and Chien-Wei Wang, Taoyuan (TW)
Assigned to VANGUARD INTERNATIONAL SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed by Vanguard International Semiconductor Corporation, Hsinchu (TW)
Filed on Nov. 22, 2023, as Appl. No. 18/517,890.
Prior Publication US 2025/0167785 A1, May 22, 2025
Int. Cl. H03K 19/0185 (2006.01)
CPC H03K 19/018521 (2013.01) 16 Claims
OG exemplary drawing
 
1. A level shifter, comprising:
a level shifting circuit receiving an input signal through an input terminal and converting the input signal from a first power domain to a second power domain to generate an output signal at an output terminal; and
a voltage tracking circuit, coupled to a first voltage terminal and a second voltage terminal, tracking one with a lower level among a first voltage of the first voltage terminal and a second voltage of the second voltage terminal to generate a control voltage,
wherein the level shifting circuit comprises:
a first N-type transistor comprising a gate coupled to the input terminal, a drain coupled to a first node, and a source coupled to a ground; and
a second N-type transistor comprising a gate receiving the control voltage, a drain coupled to the output terminal at a second node, and a source coupled to the input terminal.