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发明公开
CN103677040A 一种参考电压的驱动电路 有权

一种参考电压的驱动电路
摘要：
本发明公开了一种参考电压的驱动电路，能够实现较好的PSRR，提高参考电压的建立速度，降低电路的功耗。本发明实施例提供的参考电压的驱动电路包括闭环负反馈环路和开环支路，开环支路中包括NMOS管（M31）和NMOS管（M32）；NMOS管（M31）的漏极连接至电源VDD，NMOS管（M31）的栅极接入闭环负反馈环路所提供的第一偏置电压，NMOS管（M31）的源极输出参考电压Vrp；NMOS管（M32）的漏极与NMOS管（M31）的源极相连接，NMOS管（M32）的栅极接入闭环负反馈环路所提供的第二偏置电压，NMOS管（M32）的源极通过隔离电器件接地，NMOS管（M32）的源极输出参考电压Vrn。
摘要（英）：

The invention discloses a drive circuit of reference voltage. The drive circuit can achieve a good PSRR, increase the building speed of the reference voltage and reduce power consumption of the circuit. The drive circuit of the reference voltage comprises a closed-loop negative feedback loop and an open loop branch, wherein the open loop branch comprises an NMOS tube (M31) and an NMOS tube (M32), the drain electrode of the NMOS tube (M31) is connected with a power supply VDD, a first bias voltage provided by the closed-loop negative feedback loop is input into the grid electrode of the NMOS tube (M31), the source electrode of the NMOS tube (M31) outputs reference voltage Vrp, the drain electrode of the NMOS tube (M32) is connected with the source electrode of the NMOS tube (M31), a second bias voltage provided by the closed-loop negative feedback loop is input into the grid electrode of the NMOS tube (M32), the source electrode of the NMOS tube (M32) is grounded through an isolation electric device, and the source electrode of the NMOS tube (M32) outputs reference voltage Vrn.

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