Schmitt-trigger-based level detection circuit
First Claim
1. A Schmitt trigger, comprising:
- a number A of first PMOS transistors having the drains and sources thereof serially connected and coupled between a voltage source and an output end, and having gates thereof coupled to an input end;
a number B of first NMOS transistors having the drains and sources thereof serially connected and coupled between the output end and ground, and having gates thereof coupled to the input end;
a number C of second PMOS transistors functioning as feedback transistors, each of which is coupled between ground and a node between the drain and the source of the first PMOS transistors and has the gate thereof coupled to the output end; and
a number D of second NMOS transistors functioning as feedback transistors, each of which is coupled between the voltage source and a node between the drain and the source of the first NMOS transistors and has the gate thereof coupled to the output end;
wherein A is greater than 2 and greater than C, and B is greater than 2 and greater than D.
1 Assignment
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Accused Products
Abstract
A Schmitt trigger includes A first PMOS transistors having the drains and sources thereof serially connected and coupled between a voltage source and an output end, and having gates thereof coupled to an input end; B first NMOS transistors having the drains and sources thereof serially connected and coupled between the output end and ground, and having gates thereof coupled to the input end; C second PMOS transistors, each being coupled between ground and a node between the drain and the source of the first PMOS transistors and having the gate thereof coupled to the output end; and D second NMOS transistors, each being coupled between the voltage source and a node between the drain and the source of the first NMOS transistors and having the gate thereof coupled to the output end. A is greater than 2 and C, and B is greater than 2 and D.
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Citations
6 Claims
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1. A Schmitt trigger, comprising:
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a number A of first PMOS transistors having the drains and sources thereof serially connected and coupled between a voltage source and an output end, and having gates thereof coupled to an input end; a number B of first NMOS transistors having the drains and sources thereof serially connected and coupled between the output end and ground, and having gates thereof coupled to the input end; a number C of second PMOS transistors functioning as feedback transistors, each of which is coupled between ground and a node between the drain and the source of the first PMOS transistors and has the gate thereof coupled to the output end; and a number D of second NMOS transistors functioning as feedback transistors, each of which is coupled between the voltage source and a node between the drain and the source of the first NMOS transistors and has the gate thereof coupled to the output end; wherein A is greater than 2 and greater than C, and B is greater than 2 and greater than D. - View Dependent Claims (2)
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3. A Schmitt trigger, comprising:
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a number A of first MOS transistors having the drains and sources thereof serially connected and coupled between a first voltage and an output end, and having gates thereof coupled to an input end; a number B of second MOS transistors having the drains and sources thereof serially connected and coupled between the output end and a second voltage, and having gates thereof coupled to the input end; a number C of third MOS transistors being the same type as the first MOS transistors and functioning as feedback transistors, each of which is coupled to a node between the drain and the source of the first MOS transistors and has the gate thereof coupled to the output end; a number D of fourth MOS transistors being the same type as the second MOS transistors and functioning as feedback transistors, each of which is coupled to a node between the drain and the source of the second MOS transistors and has the gate thereof coupled to the output end; and a switch control unit coupled to the drains of the fourth MOS transistors for selectively connecting the drains of the fourth MOS transistors to the second voltage; wherein A is greater than C, and B is greater than D. - View Dependent Claims (4)
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5. A Schmitt trigger, comprising:
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a number A of first PMOS transistors having the drains and sources thereof serially connected and coupled between a voltage source and an output end, and having gates thereof coupled to an input end; a number B of first NMOS transistors having the drains and sources thereof serially connected and coupled between the output end and ground, and having gates thereof coupled to the input end; a number C of second PMOS transistors functioning as feedback transistors, each of which is coupled to a node between the drain and the source of the first PMOS transistors and has the gate thereof coupled to the output end; a number D of second NMOS transistors functioning as feedback transistors, each of which is coupled to a node between the drain and the source of the first NMOS transistors and has the gate thereof coupled to the output end; and a switch control unit coupled to the drains of the second NMOS transistors for selectively connecting the drains of the second NMOS transistors to the voltage source; wherein A is greater than C, and B is greater than D. - View Dependent Claims (6)
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Specification