Patent ID: 7741874

Claim:
Electronic circuit, comprising an input for coupling a circuit of a first voltage domain to the electronic circuit, a first, second, third and fourth transistor coupled between a supply voltage and a voltage, wherein the third transistor is coupled between the voltage and a first node, wherein the second transistor is coupled between a second node and the output, wherein the third transistor is coupled between the first node and the output, wherein the fourth transistor is coupled between the supply voltage and the second node, a first reference voltage generating unit which receives the voltage at the first node and the voltage as input, wherein its output is coupled to the gate of the second transistor, and a second reference voltage generating unit which receives the supply voltage and the voltage of the second node as input, wherein its output is coupled to the gate of the third transistor, wherein the first and second reference voltage generating units generate a reference voltage according to at least one of the logic states of the first, second, third or fourth transistor.