公开(公告)号：US09444435B1

公开(公告)日：2016-09-13

申请号：US14887487

申请日：2015-10-20

Applicant: STMicroelectronics S.r.l.

Inventor： Enrico Monaco ,  Gabriele Anzalone ,  Simone Erba

IPC: H03K3/03

CPC classification number: H03K3/0322

Abstract: A ring oscillator includes a first delay stage generating a first phase signal and a second delay stage generating a second phase signal. Each of the first and second delay stages includes variable resistance circuit. A phase comparator circuit performs a phase comparison between the first and second phase signals to generate a phase error signal. An amplifier circuit generates a control signal from the phase error signal. A feedback loop applies the control signal to control the resistance of the variable resistance circuits in the first and second delay stages.

Abstract translation: 环形振荡器包括产生第一相位信号的第一延迟级和产生第二相位信号的第二延迟级。 第一和第二延迟级中的每一个包括可变电阻电路。 相位比较器电路执行第一和第二相位信号之间的相位比较，以产生相位误差信号。 放大器电路从相位误差信号产生控制信号。 反馈回路施加控制信号以控制第一和第二延迟级中的可变电阻电路的电阻。