Patent ID: 7986189

Claim:
A circuit comprising: a first resistive element having a first terminal coupled to a cathode of a diode and having a second terminal, wherein the diode provides an input to the circuit; a second resistive element having a first terminal coupled to a first power supply terminal and having a second terminal; a first transistor having a first current electrode coupled to the second terminal of the second resistive element, a control electrode, and a second control electrode coupled to provide an output of the circuit; a second transistor having a first current electrode coupled to the second terminal of the first resistive element, a control electrode, and a second current electrode coupled to the control electrode of the first transistor; a third resistive element having a first terminal coupled to the first power supply terminal and a second terminal coupled to a first circuit node; a third transistor having a first current electrode coupled to the first circuit node, a control electrode coupled to the control electrode of the second transistor, and a second current electrode coupled to the control electrode of the second transistor; a fourth transistor having a first current electrode coupled to the second terminal of the second resistive element, a control electrode coupled to the control electrode of the second transistor, and a second current electrode; and a fifth transistor having a first current electrode coupled to the first circuit node, a second current electrode, and a control electrode coupled to the second current electrode of the fourth transistor.