US 12,009,814 B2
Level shifter with low propagation delay
Chao-Chun Sung, Hsinchu (CN); Che-Lun Hsu, Hsinchu (CN); and Chang-Han Li, Hsinchu (CN)
Assigned to SIGMASTAR TECHNOLOGY LTD., Fujian (CN)
Filed by SigmaStar Technology Ltd., Fujian (CN)
Filed on Dec. 20, 2022, as Appl. No. 18/084,799.
Claims priority of application No. 202210307108.X (CN), filed on Mar. 25, 2022.
Prior Publication US 2023/0308101 A1, Sep. 28, 2023
Int. Cl. H03K 19/0175 (2006.01); H03K 19/017 (2006.01); H03K 19/0185 (2006.01); H03K 19/173 (2006.01); H03K 19/20 (2006.01)
CPC H03K 19/017 (2013.01) [H03K 19/018507 (2013.01); H03K 19/1737 (2013.01); H03K 19/20 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A level shifter, comprising:
a low-level adjustment circuit, selectively pulling down a level of one between a first input node and a second input node to a first low supply voltage according to an input signal;
a first comparator, outputting a one having higher level between the level of the first input node and a second low supply voltage to a first output node, wherein the second low supply voltage is higher than the first low supply voltage; and
a high-level adjustment circuit, selectively adjusting the level of the first output node according to the level of the first input node and the level of the second input node to generate an output signal,
wherein the high-level adjustment circuit comprises:
a first transistor, selectively pulling up a level of a first control node to a high supply voltage according to a level of a second output node;
a second transistor, selectively pulling up a level of a second control node to the high supply voltage according to the level of the first output node;
a third transistor, selectively pulling down the level of the first control node to the second low supply voltage according to the level of the second control node;
a fourth transistor, selectively pulling down the level of the second control node to the second low supply voltage according to the level of the first control node;
a fifth transistor, biased by the second low supply voltage, and selectively turned on according to the level of the first control node so as to adjust the level of the first input node; and
a sixth transistor, biased by the second low supply voltage, and selectively turned on according to the level of the second control node so as to adjust the level of the second input node.