US 11,923,855 B2
Schmitt trigger with pull-up transistor
Manoj Kumar Tiwari, Unnao (IN); and Saiyid Mohammad Irshad Rizvi, New Delhi (IN)
Assigned to STMicroelectronics International N.V., Geneva (CH)
Filed by STMicroelectronics International N.V., Geneva (CH)
Filed on Sep. 13, 2022, as Appl. No. 17/931,864.
Claims priority of provisional application 63/246,213, filed on Sep. 20, 2021.
Prior Publication US 2023/0086329 A1, Mar. 23, 2023
Int. Cl. H03K 3/00 (2006.01); H03K 3/037 (2006.01); H03K 3/13 (2006.01)
CPC H03K 3/0377 (2013.01) [H03K 3/037 (2013.01); H03K 3/13 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An integrated circuit, comprising:
a Schmitt trigger including:
a main input;
a main output;
a first inverter coupled to the main input;
a second inverter coupled between the first inverter and the main output;
a pass transistor coupled between the first inverter and the second inverter; end a pull-up transistor having a drain terminal coupled between the pass transistor and the second inverter;
a reference voltage generator configured to receive a supply voltage and to generate a high reference voltage based on the supply voltage; and
a control signal generator coupled between the main input and the first inverter and configured to generate a control signal having a value based on an input voltage at the main input, wherein a gate terminal of the pull-up transistor receives the control signal, wherein the control signal is equal to the high reference voltage when the input voltage is high, wherein the control signal is 0 V when the input voltage is low.