Patent ID: 8970285
Filing Date: 2015-03-03
Classification: H03K

Abstract:
1. A dual supply level shifter circuit comprising: a supply switching circuit comprising a first set of coupled transistors, wherein the supply switching circuit is coupled to a first supply source that is configured to provide a first power supply voltage and is coupled to a second supply source that is configured to provide a second power supply voltage; a set of level shifter circuits coupled to the supply switching circuit, wherein the set of level shifter circuits comprises a first set of coupled transistors and a second set of coupled transistors, coupled to receive output signals of the first set of coupled transistors wherein the set of level shifter circuits is configured to receive a voltage input signal at an input node from a first circuit and to supply to an output node of the dual supply level shifter circuit an output signal having a value that is a highest voltage value between the first power supply voltage and the second power supply voltage, which is passed by the supply switching circuit to the set of level shifter circuits.