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US 8,803,551 B2Granted
Low supply voltage logic circuit
AssigneeInfineon Technologies Austria AG
InventorRobert Kappel
Life of this patent
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Abstract
A low supply voltage logic circuit includes a first current source operable to generate a first current dependent on a first control signal and to generate a first leakage current. A second current source is operable to generate a second current dependent on a second control signal and to generate a second leakage current. A third current source has a third current path between the output terminal and the first supply voltage terminal and is operable to generate a third current through the third current path to compensate for the second leakage current. A fourth current source has a fourth current path between the output terminal and the second supply voltage terminal and is operable to generate a fourth current through the fourth current path to compensate for the first leakage current.
Claims18
A low supply voltage logic circuit comprising:
- a first current source that has a first control input applied to receive a first control signal and a first current path between an output terminal and a first supply voltage terminal, the first current source being operable to generate a first current through the first current path dependent on the first control signal and a first leakage current;
- a second current source that has a second control input coupled to receive a second control signal and a second current path between the output terminal and a second supply voltage terminal, the second current source being operable to generate a second current through the second current path dependent on the second control signal and a second leakage current, wherein the first control signal and the second control signal correspond to an input voltage so that the first current source and the second current source are controlled inversely;
- a third current source that has a third current path between the output terminal and the first supply voltage terminal, the third current source operable to generate a third current through the third current path to compensate for the second leakage current;
- a fourth current source that has a fourth current path between the output terminal and the second supply voltage terminal, the fourth current source operable to generate a fourth current through the fourth current path to compensate for the first leakage current;
- and
- wherein a sum of the first current and the third current substantially equals a sum of the second current and the fourth current when the first control signal is operated at a switching threshold.
3 more elements
A method of operating a circuit, wherein the method comprises:
- generating a first current through a first current path of a first current source coupled between an output terminal and a first supply voltage terminal, wherein the first current is dependent on an input voltage and a first leakage current;
- generating a second current through a second current path of a second current source coupled between the output terminal and a second supply voltage terminal, wherein the second current is dependent on the input voltage and a second leakage current, wherein the input voltage affects the first current source and the second current source inversely;
- generating a third current through a third current path of a third current source coupled between the output terminal and the first supply voltage terminal, wherein the third current compensates for the second leakage current;
- and
- generating a fourth current through a fourth current path of a fourth current source coupled between the output terminal and the second supply voltage terminal, wherein the fourth current compensates for the first leakage current, wherein a sum of the first current and the third current substantially equals a sum of the second current and the fourth current when the input voltage is operated at a switching threshold.
2 more elements
A circuit comprising:
- a first transistor of a first device type having a first control terminal coupled to an input voltage node, a first terminal coupled to an output node, and a second terminal coupled to a first supply voltage;
- a second transistor of a second device type opposite the first device type having a second control terminal coupled to the input voltage node, a third terminal coupled to the output node, and a fourth terminal coupled to a second supply voltage;
- a third transistor of the second device type having a third control terminal coupled to the output node, a fifth terminal coupled to the output node, and a sixth terminal coupled to the first supply voltage, wherein the third transistor is sized to provide a current that compensates for a second leakage current in the second transistor when the input voltage node is at a first voltage;
- and
- a fourth transistor of the first device type having a fourth control terminal coupled to the output node, a seventh terminal coupled to the output node, and an eighth terminal coupled to the second supply voltage, wherein the fourth transistor is sized to provide a current that compensates for a first leakage current in the first transistor when the input voltage node is at a first voltage.
2 more elements
A circuit comprising:
- a first transistor of a first device type having a first control terminal coupled to an input voltage node, a first terminal coupled to an output node, and a second terminal coupled to a first supply voltage;
- a second transistor of a second device type opposite the first device type having a second control terminal coupled to the input voltage node, a third terminal coupled to the output node, and a fourth terminal coupled to a second supply voltage;
- a third transistor of the second device type having a third control terminal coupled to the output node, a fifth terminal coupled to the output node, and a sixth terminal coupled to the first supply voltage;
- a fourth transistor of the first device type having a fourth control terminal coupled to the output node, a seventh terminal coupled to the output node, and an eighth terminal coupled to the second supply voltage;
- and
- wherein the first transistor has a first body contact coupled to the first supply voltage, the second transistor has a second body contact coupled to the second supply voltage, the third transistor has a third body contact coupled to the second supply voltage, and the fourth transistor has a fourth body contact coupled to the first supply voltage.
3 more elements
A circuit comprising:
- a first transistor of a first device type having a first control terminal coupled to an input voltage node, a first terminal coupled to an output node, and a second terminal coupled to a first supply voltage;
- a second transistor of a second device type opposite the first device type having a second control terminal coupled to the input voltage node, a third terminal coupled to the output node, and a fourth terminal coupled to a second supply voltage;
- a third transistor of the second device type having a third control terminal coupled to the output node, a fifth terminal coupled to the output node, and a sixth terminal coupled to the first supply voltage;
- a fourth transistor of the first device type having a fourth control terminal coupled to the output node, a seventh terminal coupled to the output node, and an eighth terminal coupled to the second supply voltage;
- and
- wherein the first transistor has a first body contact coupled to the first supply voltage, the second transistor has a second body contact coupled to the second supply voltage, the third transistor has a third body contact coupled to the output node, and the fourth transistor has a fourth body contact coupled to the output node.
3 more elements
Dependencies are inferred from the claim text.