US 12,323,141 B2
Level shifter
Hsin-Cheng Hsu, Hsinchu (TW); and Federico Agustin Altolaguirre, Hsinchu (TW)
Assigned to MEDIATEK INC., Hsinchu (TW)
Filed by MEDIATEK INC., Hsinchu (TW)
Filed on May 2, 2023, as Appl. No. 18/310,699.
Application 18/310,699 is a continuation in part of application No. 17/578,643, filed on Jan. 19, 2022, granted, now 11,695,395.
Claims priority of provisional application 63/171,640, filed on Apr. 7, 2021.
Prior Publication US 2023/0268925 A1, Aug. 24, 2023
Int. Cl. H03K 3/356 (2006.01); H03K 19/0175 (2006.01); H03K 19/0185 (2006.01)
CPC H03K 19/018521 (2013.01) [H03K 3/356113 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A level shifter, comprising:
a power multiplexer, receiving a plurality of power voltage candidates to selectively output a selected power voltage;
a first pull-up device and a second pull-up device; and
a first pull-down device and a second pull-down device;
wherein:
in response to a low-to-high transition of an input signal of the level shifter, a first output terminal of the level shifter is pulled up to the selected power voltage by the second pull-up device, and the first pull-down device pulls down a second output terminal of the level shifter to a low-voltage level corresponding to the selected power voltage;
in response to a high-to-low transition of the input signal of the level shifter, the second output terminal of the level shifter is pulled up to the selected power voltage by the first pull-up device, and the second pull-down device pulls down the first output terminal of the level shifter to the low-voltage level corresponding to the selected power voltage;
each pull-down device includes a plurality of pull-down paths corresponding to the different power voltage candidates; and
in response to a selection made through the power multiplexer, a pull-down path corresponding to the selected power voltage in each pull-down device is turned on and the other pull-down paths are turned off.