公开(公告)号：US10476456B2

公开(公告)日：2019-11-12

申请号：US15465667

申请日：2017-03-22

Applicant: MediaTek Inc.

Inventor： Ayman Shabra ,  Michael A. Ashburn, Jr.

IPC: H03F3/45 ,  H03K3/00 ,  H03K3/356 ,  H03K5/24

Abstract: A comparator is described. The comparator may be used in several applications, including in digital-to-analog converters (ADC). The comparator may comprise a high-speed amplifier, a low-noise amplifier, a controller and a bi-stable circuit. The high-speed amplifier may be activated during a first period, for example when the comparator tends to exhibit a slow response. During this period, the comparator may sacrifice the noise performance. The low-noise amplifier may be activated during a second period, for example when the difference between the signals appearing as inputs to the comparator is small. The low-noise amplifier may have a gain that is large enough to limit decision errors. The bi-stable circuit, which may be implemented using a latch, may be configured to output a signal equal to one of the supply voltages, in response to receiving the input signal from one of the stages.

公开(公告)号：US20180097487A1

公开(公告)日：2018-04-05

申请号：US15465667

申请日：2017-03-22

Applicant: MediaTek Inc.

Inventor： Ayman Shabra ,  Michael A. Ashburn, JR.

IPC: H03F3/45

Abstract: A comparator is described. The comparator may be used in several applications, including in digital-to-analog converters (ADC). The comparator may comprise a high-speed amplifier, a low-noise amplifier, a controller and a bi-stable circuit. The high-speed amplifier may be activated during a first period, for example when the comparator tends to exhibit a slow response. During this period, the comparator may sacrifice the noise performance. The low-noise amplifier may be activated during a second period, for example when the difference between the signals appearing as inputs to the comparator is small. The low-noise amplifier may have a gain that is large enough to limit decision errors. The bi-stable circuit, which may be implemented using a latch, may be configured to output a signal equal to one of the supply voltages, in response to receiving the input signal from one of the stages.