公开(公告)号：US09019026B2

公开(公告)日：2015-04-28

申请号：US14073198

申请日：2013-11-06

Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.

Inventor： Hong Wu Lin

IPC: H03K3/023 ,  H03K3/0231

CPC classification number: H03K3/0231

Abstract: An oscillator module includes a first MOS transistor and a capacitor. The capacitor is coupled between a gate and source of the first MOS transistor. The drain of the first MOS transistor receives a first bias current and generates an oscillating output signal. A switching circuit operates in response to the oscillating output signal to selective charge and discharge the capacitor. A current sourcing circuit is configured to generate the bias current. The current sourcing circuit includes a second MOS transistor which has an identical layout to the first MOS transistor and receives a second bias current. A resistor is coupled between a gate and source of the second MOS transistor. The current sourcing circuit further includes a current mirror having an input configured to receive a reference current passing through the resistor and generate the first and second bias currents.

Abstract translation: 振荡器模块包括第一MOS晶体管和电容器。 电容器耦合在第一MOS晶体管的栅极和源极之间。 第一MOS晶体管的漏极接收第一偏置电流并产生振荡输出信号。 开关电路响应于振荡输出信号而工作以对电容器进行选择性充电和放电。 电流源电路被配置为产生偏置电流。 电流源电路包括与第一MOS晶体管具有相同布局并接收第二偏置电流的第二MOS晶体管。 电阻器耦合在第二MOS晶体管的栅极和源极之间。 电流源电路还包括电流镜，其具有被配置为接收通过电阻器的参考电流并产生第一和第二偏置电流的输入。