公开(公告)号：US07564270B1

公开(公告)日：2009-07-21

申请号：US11769088

申请日：2007-06-27

申请人： Xiaohu Zhang ,  George Ansel

发明人： Xiaohu Zhang ,  George Ansel

IPC分类号： H03K19/086

CPC分类号： H03K19/00315 ,  H03K19/00384

摘要： A driver circuit is provided herein. In general, the driver circuit includes a driver portion, a common mode feedback portion and a current replication portion. The feedback portion receives a common mode voltage (vcm) from the driver portion and an alternative common mode voltage (vcm_alt) from the current replication portion. The feedback portion selects one of the common mode voltages for comparison with a reference voltage and generates a feedback bias signal (vcmfb) based on a voltage difference there between. When the driver circuit is enabled, the actual common mode voltage (vcm) is used to maintain the output common mode voltage around the reference voltage. When the driver circuit is disabled, the alternative common mode voltage (vcm_alt) is used to keep the bias signal (vcmfb) from drifting away.

摘要翻译： 本文提供了驱动电路。 通常，驱动器电路包括驱动器部分，共模反馈部分和当前复制部分。 反馈部分接收来自驱动器部分的共模电压（vcm）和来自当前复制部分的替代共模电压（vcm_alt）。 反馈部分选择用于与参考电压进行比较的共模电压之一，并基于它们之间的电压差产生反馈偏置信号（vcmfb）。 当驱动器电路使能时，实际的共模电压（vcm）用于维持参考电压周围的输出共模电压。 当驱动器电路被禁用时，替代共模电压（vcm_alt）用于保持偏置信号（vcmfb）不被漂移。