US 12,136,917 B2
Voltage level shifter for sub-threshold operation
Kallol Chatterjee, Kolkata (IN); and Rohit Kumar Gupta, Noida (IN)
Assigned to STMicroelectronics International N.V., Geneva (CH)
Filed by STMicroelectronics International N.V., Geneva (CH)
Filed on Jan. 6, 2023, as Appl. No. 18/151,337.
Claims priority of provisional application 63/299,833, filed on Jan. 14, 2022.
Prior Publication US 2023/0231559 A1, Jul. 20, 2023
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 stage including first and second nodes, the level shifting stage being configured to receive a first signal from a first voltage domain and output a second signal to a second voltage domain; and
a first auxiliary stage configured to:
receive the first signal;
in response to the first signal having a first voltage level corresponding to a first logical state and the first node having a supply voltage level, provide current to the second node to transition the first node to a reference voltage; and
in response to the first signal having the first voltage level and the first node having the reference voltage, stop current flow to the second node.