Patent ID: 7999523
Filing Date: 2011-08-16
Classification: H03K

Abstract:
1. An integrated circuit comprising: a first regulator circuit configured to receive power from an external power supply and configured to provide a first regulated voltage; a second regulator circuit configured to receive power from the external power supply and configured to provide a second regulated voltage; a first circuit configured to provide a first version of a signal, the first version of the signal being referenced between the first regulated voltage and a first power supply voltage, wherein the first power supply voltage is on a first power supply node coupled to the external power supply; a second circuit configured to provide a second version of the signal, the second version of the signal being referenced between the second regulated voltage and a second power supply voltage, wherein the second power supply voltage is on a second power supply node coupled to the external power supply; and a third circuit configured to provide to an output node, a third version of the signal, the third version of the signal being at least partially based on the first and second versions of the signal and the third version of the signal being further based on power received from the external power supply, the third version of the signal being referenced between the first power supply voltage and the second power supply voltage, wherein the first version of the signal is a low voltage, low voltage swing signal and the second version of the signal is a high-voltage, low voltage swing signal, and the third version of the signal is a high voltage, high-voltage swing signal.