公开(公告)号：US20130038394A1

公开(公告)日：2013-02-14

申请号：US13567151

申请日：2012-08-06

Applicant: PING LIN LIU

Inventor： PING LIN LIU

IPC: H03F3/45 ,  H03F3/04

CPC classification number: H03F1/0205 ,  H03F3/3022 ,  H03F3/45381 ,  H03F2200/408 ,  H03F2203/45674 ,  H03F2203/45728

Abstract: The present invention relates to an operational amplifier comprising an input-stage circuit, a floating current mirror circuit, and an output-stage circuit. The input-stage circuit receives an input signal and produces a control signal. The floating current mirror circuit is coupled to the input-stage circuit, and produces a mirror current according to the control signal. The output-stage circuit is coupled to the floating current mirror circuit, and produces a driving signal according to the mirror current. When the operational amplifier is operating in the static mode, the output-stage circuit further produces a static current according to the mirror current. Thereby, by using the floating current mirror circuit, the purpose of low power consumption can be achieved while driving to the high-voltage mode or to the low-voltage mode.

Abstract translation: 本发明涉及一种运算放大器，包括输入级电路，浮动电流镜电路和输出级电路。 输入级电路接收输入信号并产生控制信号。 浮动电流镜电路耦合到输入级电路，并根据控制信号产生镜电流。 输出级电路耦合到浮动电流镜电路，并根据镜电流产生驱动信号。 当运算放大器工作在静态模式时，输出级电路进一步根据镜电流产生静态电流。 因此，通过使用浮动电流镜电路，可以在驱动到高电压模式或低电压模式时实现低功耗的目的。