Patent ID: 8405459
Filing Date: 2013-03-26
Classification: H03F

Abstract:
1. A folded cascode differential amplifier powered by a first power supply supplying a first power supply voltage and a second power supply supplying second power supply voltage lower than the first power supply voltage, comprising: an input stage powered by the first power supply, the input stage including a first plurality of MOS transistors, two of which form a differential pair for receiving respective input voltage signals; and an output stage powered by the second power supply, the output stage including a second plurality of MOS transistors, some of which form a first current mirror circuit connected to both transistors of the differential pair, the second plurality of MOS transistors also including at least one transistor forming an amplifying stage that amplifies a voltage produced in the first current mirror circuit to generate an output voltage signal, wherein the first plurality of MOS transistors have higher breakdown voltages than the second plurality of MOS transistors.