LEVEL SHIFTER HAVING SINGLE VOLTAGE SOURCE
First Claim
1. An apparatus comprising:
- a pull-up PMOS transistor and a pull-down NMOS transistor connected in series between a high voltage source and ground as an inverter, and having an output node connected to an output terminal;
a control node which is connected to inputs of the pull-up PMOS transistor and pull-down NMOS transistor;
an input gate for connecting the control node to the high voltage source or ground according to a voltage level of the input terminal; and
a first feedback chain which is connected between the control node and the input gate such that when the voltage level of the input terminal is high, the feedback chain disconnects a path from the high voltage source to the control node via the input gate, while the input gate connects the control node to ground.
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Accused Products
Abstract
Embodiments relate to a level shifter which uses a single voltage source, has an excellent operation characteristic even when a difference between a low voltage and a high voltage is large, and can be easily designed. Embodiments relate to a level shifter for shifting a voltage level between an input terminal connected to a circuit block which operates by a low voltage source and an output terminal connected to a circuit block which operates by a high voltage source. In embodiments, the level shifter may include a pull-up PMOS and a pull-down NMOS, both of which are connected between the high voltage source and ground in the form of an inverter and have an output node connected to the output terminal. The level shifter may include a control node which is connected to inputs of the pull-up and pull-down NMOS in the form of the inverter. The level shifter may have an input gate for connecting the control node to the high voltage source or ground according to a voltage level of the input terminal. The level shifter may also include a first feedback chain which is connected between the control node and the input gate and disconnects the input gate and the high voltage source when the voltage level of the input terminal is high and the input gate connects the control node to ground.
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Citations
20 Claims
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1. An apparatus comprising:
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a pull-up PMOS transistor and a pull-down NMOS transistor connected in series between a high voltage source and ground as an inverter, and having an output node connected to an output terminal; a control node which is connected to inputs of the pull-up PMOS transistor and pull-down NMOS transistor; an input gate for connecting the control node to the high voltage source or ground according to a voltage level of the input terminal; and a first feedback chain which is connected between the control node and the input gate such that when the voltage level of the input terminal is high, the feedback chain disconnects a path from the high voltage source to the control node via the input gate, while the input gate connects the control node to ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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manufacturing a level shifter for shifting a voltage level between an input terminal connected to a circuit block which operates by a low voltage source and an output terminal connected to a circuit block which operates by a high voltage source, by; selecting a specification of a level shifter; selecting an implant condition of a MOS transistor forming the transistor; determining whether a preselected condition is matched; using the implant condition to form a cell of the level shifter if the preselected condition is matched; and selecting a different specification of a level shifter if the preselected condition is not matched. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification