公开(公告)号：US08836428B2

公开(公告)日：2014-09-16

申请号：US13669518

申请日：2012-11-06

Applicant: Sitronix Technology Corp.

Inventor： Ping-Lin Liu

IPC: H03F3/45 ,  H03F1/02

CPC classification number: H03F3/45076 ,  H03F1/0261 ,  H03F3/45183 ,  H03F2203/45626 ,  H03F2203/45674

Abstract: The present invention relates to an operational amplifier having low power consumption, which comprises a differential circuit, an output-stage circuit, and a floating bias generating circuit. The differential circuit receives an input signal and produces a control signal. The output-stage circuit is coupled to the differential circuit and produces an output signal according to the control signal. The floating bias generating circuit is coupled between the differential circuit and the output-stage circuit and generates a floating bias according to the control signal for controlling the rising or lowering of the voltage level of the output signal. Accordingly, the operational amplifier can charge and discharge rapidly, and thus extending the applications of the operational amplifier. Besides, the floating bias generating circuit can limit the output current while the operational amplifier is driving, and thus achieving the purpose of low power consumption.

Abstract translation: 本发明涉及具有低功耗的运算放大器，其包括差分电路，输出级电路和浮置偏置产生电路。 差分电路接收输入信号并产生控制信号。 输出级电路耦合到差分电路，并根据控制信号产生输出信号。 浮动偏置产生电路耦合在差分电路和输出级电路之间，并根据控制信号产生浮置偏置，用于控制输出信号的电压电平的上升或下降。 因此，运算放大器可以快速充放电，从而延长运算放大器的应用。 此外，浮动偏置发生电路可以在运算放大器正在驱动时限制输出电流，从而达到低功耗的目的。