公开(公告)号：DE60234749D1

公开(公告)日：2010-01-28

申请号：DE60234749

申请日：2002-04-12

Applicant: ST MICROELECTRONICS LTD

Inventor： DARZY SAUL

IPC: H03F3/30

Abstract: This invention relates to a circuit used in the output stage of an operational amplifier which allows a rail to rail swing of the output voltage while consuming low quiescent power. The circuit comprising first (Q1) and second (Q2) control elements each having a controllable path and a control node. The circuit further comprises a third control element (Q3) having a controllable path connected between said control nodes of said first and second control elements via a resisted path (R1,R2). A voltage indicative of a signal input to amplifier is received by a node on the resistive path (R1,R2), such that current flow through the controllable path of said first control element (Q1) and said third element (Q3) changes in response to a change in the voltage at said node; and such that current flow through said controllable path of said second element (Q2) changes independence on the current flow through the controllable path of said third control elements (Q3), whereby as one of the first and second control elements (Q1,Q2) is turned on, the other is held off.