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US 11,923,855 B2Granted
Schmitt trigger with pull-up transistor
AssigneeSTMicroelectronics International N.V.
InventorsManoj Kumar Tiwari, Saiyid Mohammad Irshad Rizvi
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Abstract
An integrated circuit includes an input pad and a Schmitt trigger coupled to the input pad. The Schmitt trigger includes a first inverter and a second inverter. The Schmitt trigger includes a pull-up transistor coupled to an input of the second inverter and configure to supply a high reference voltage to the input of the second inverter.
Claims16
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.
7 more elements
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;
- and
- 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 supply voltage selector configured to provide either a low supply voltage or a high supply voltage as the supply voltage based on a mode selection value.
7 more elements
A method, comprising:
- receiving an input voltage at a main input of a Schmitt trigger;
- generating a control signal having a value based on the input voltage;
- and
- providing the control signal to a gate terminal of a pull-up transistor having a drain terminal coupled between a first inverter and a second inverter of the Schmitt trigger.
1 more element
An integrated circuit, comprising:
- a supply voltage selector configured to receive a selection signal and to output a supply either a high supply voltage or a low supply voltage as a supply voltage responsive to the selection signal;
- a reference voltage generator configured to generate a reference voltage based on the supply voltage;
- and
- a Schmitt trigger configured to receive the supply voltage, the reference voltage, and an input voltage, the Schmitt trigger including:
- an main input;
- a first inverter;
- a second inverter coupled to the first inverter;
- a control signal generator coupled between the input and the first inverter and configured to generate a control signal based on the input voltage;
- and
- a pull-up transistor having a first terminal coupled to an input of the second inverter and a second terminal configured to receive the control signal.
7 more elements
Dependencies are inferred from the claim text.