Patent ID: 7579911
Filing Date: 2009-08-25
Classification: H03F

Abstract:
1. An amplifier including a differential output stage and a differential input stage, wherein the differential output stage includes a first current path and a second current path outputting differential signals and connected between a first power supply and a second power supply, the first current path includes a first resistance element between the first power supply and a first node, a first transistor and a second transistor between the first node and a second node, and a second resistance element between the second node and the second power supply, the second current path includes a third resistance element between the first power supply and a third node, a third transistor and a fourth transistor between the third node and a fourth node, and a fourth resistance element between the fourth node and the second power supply, a gate of the first transistor is connected to the fourth node, a gate of the second transistor is connected to the third node, a gate of the third transistor is connected to the second node, a gate of the fourth transistor is connected to the first node, and current output from the differential input stage is connected to the first node and the third node.