Patent ID: 9071205
Filing Date: 2015-06-30
Classification: H03F

Abstract:
1. A single-input class-AB output stage comprising: a current-splitting stage comprising: a signal current; a tail current, the signal current and tail current together forming a splitting-stage current; a first cascode three-node transistor wherein the first node receives a cascode biasing voltage, the second node is driven by the splitting-stage current, and the third node provides a first intermediate output current; and a second cascode three-node transistor wherein the first node is biased to the cascode biasing voltage, the second node is driven by the splitting-stage current, and the third node provides a second intermediate output current; whereby the splitting-stage current is split between the second nodes of the cascode transistors and whereby each cascode transistor provides at its third node a current substantially identical to the current provided at its second node; and a drive stage comprising a first intermediate input current receiving the first intermediate output current of the current-splitting stage and a second intermediate input current receiving the second intermediate output current of the current-splitting stage, the first intermediate input current driving a first output three-node transistor and the second intermediate input current driving a second output three-node transistor.