Isolation circuit
AssigneeIndustrial Technology Research Institute
InventorsYung-Fa Chou, Ding-Ming Kwai
Life of this patent
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Abstract
An isolation circuit is provided. The isolation circuit is coupled to an output and an input node and includes a first set, a second switch set, and a body bias voltage generator. The first switch set couples a switch control node to a second voltage when a first voltage is at a first voltage level, and couples the switch control node to the input node when the first voltage is at a second voltage level. The second switch set couples the output node to the input node when the first voltage is at the first voltage level, and isolates the output node from the input node when the first voltage is at the second voltage level. The body bias voltage generator selectively provides a higher one of the first voltage and a voltage on the input node to a body of the second switch set.
Claims21
An isolation circuit, coupled between an output node of a first circuit and an input node of a second circuit, the first circuit is powered by a first voltage and a second voltage, and the isolation circuit comprising:
- a first switch, having a first terminal coupled to the input node of the second circuit, and a control terminal coupled to the first voltage;
- a second switch, having a first terminal coupled to a second terminal of the first switch, a second terminal coupled to the second voltage, and a control terminal coupled to the first voltage;
- a third switch, having a first terminal and a second terminal respectively coupled to the output node of the first circuit and the input node of the second circuit, and a control terminal coupled to the second terminal of the first switch;
- and
- a body bias voltage generator, coupled to the first voltage and the input node of the second circuit, and selectively providing a higher one of the first voltage and a voltage on the input node of the second circuit to a body of the third switch.
An isolation circuit, coupled between an output node of a first circuit and an input node of a second circuit, the first circuit is powered by a first voltage and a second voltage, and the isolation circuit comprising:
- a first switch set, coupled to the first voltage and the input node of the second circuit, for coupling a switch control node to the second voltage when the first voltage is at a first voltage level, and coupling the switch control node to the input node of the second circuit when the first voltage is at a second voltage level;
- a second switch set, coupled between the output node of the first circuit and the input node of the second circuit, wherein the second switch set is controlled by the switch control node to determine whether or not to isolate the output node of the first circuit from the input node of the second circuit;
- and
- a body bias voltage generator, coupled to the first voltage and the input node of the second circuit, wherein the body bias voltage generator selectively provides a higher one of the first voltage and a voltage on the input node of the second circuit to a body of the second switch set.
Dependencies are inferred from the claim text.