公开(公告)号：US20200127668A1

公开(公告)日：2020-04-23

申请号：US16723205

申请日：2019-12-20

Applicant: Taiwan Semiconductor Manufacturing Co., Ltd.

Inventor： Ting-Kuei KUAN ,  Cheng-Hsiang HSIEH ,  Chen-Ting KO ,  Ruey-Bin SHEEN ,  Chih-Hsien CHANG

IPC: H03L7/089 ,  H03L7/093 ,  H03L7/099 ,  H03L7/091 ,  H03K7/08 ,  H03L7/097 ,  H03L7/087

Abstract: Phase-locked loops (PLLs) are provided. A PLL includes a voltage-controlled oscillator (VCO), a frequency divider, a track-and-hold charge pump, and a frequency tracking circuit. The VCO is configured to provide an output clock corresponding to a pumping current. The frequency divider is configured to divide the output clock to provide a feedback signal. The track-and-hold charge pump is configured to provide the pumping current according to a reference clock and the feedback signal. The frequency tracking circuit is configured to decrease frequency error between the feedback signal and the reference clock. The track-and-hold charge pump includes a pumping switch and a pulse width modulator (PWM). The PWM is configured to provide a PWM signal to control the pumping switch according to the reference clock, so as to provide the pumping current corresponding to the feedback signal.

公开(公告)号：US20180302096A1

公开(公告)日：2018-10-18

申请号：US15490096

申请日：2017-04-18

Applicant: Taiwan Semiconductor Manufacturing Co., Ltd.

Inventor： Ting-Kuei KUAN ,  Cheng-Hsiang HSIEH ,  Chen-Ting KO ,  Ruey-Bin SHEEN ,  Chih-Hsien CHANG

IPC: H03L7/089 ,  H03K7/08 ,  H03L7/091 ,  H03L7/099 ,  H03L7/093

CPC classification number: H03L7/0891 ,  H03K7/08 ,  H03L7/087 ,  H03L7/091 ,  H03L7/093 ,  H03L7/097 ,  H03L7/099

Abstract: Track-and-hold charge pumps and PLL are provided. A track-and-hold charge pump includes a track-and-hold circuit, a transconductance amplifier, a pulse width modulator (PWM), and a pumping switch coupled to the transconductance amplifier. The track-and-hold circuit samples an input signal according to a reference clock. The transconductance amplifier converts the sampled input signal into a current. The PWM provides a PWM signal according to the reference clock. The pumping switch is controlled by the PWM signal, to provide an output current according to the current.