Patent ID: 7924083

Claim:
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.