公开(公告)号：US20140300332A1

公开(公告)日：2014-10-09

申请号：US13874400

申请日：2013-04-30

Applicant: SYNAPTICS INCORPORATED

Inventor： Saikrishna GANTA

IPC: G05F1/56

CPC classification number: G05F1/56 ,  G05F1/575

Abstract: In a linear voltage regulator, a first stage outputs an output signal. The first stage is configured with a first switchable bias current, and is configured to receive a feedback signal. A second stage provides a regulated voltage output. A decoupling capacitor is coupled to the regulated voltage output. A feedback circuit is coupled with the second stage and configured to generate the feedback signal. A frequency compensation circuit includes a second switchable bias current. The frequency compensation circuit: pushes away an existing pole to a higher frequency when the first and second switchable bias currents are operated in a sleep mode; and creates a left-hand-side zero when the first and second switchable bias currents are operated in an active mode. The active mode comprises the first and second switchable bias currents supplying greater currents than are provided in the sleep mode.

Abstract translation: 在线性稳压器中，第一级输出一个输出信号。 第一级配置有第一可切换偏置电流，并且被配置为接收反馈信号。 第二级提供稳压电压输出。 去耦电容器耦合到稳压电压输出。 反馈电路与第二级耦合并被配置为产生反馈信号。 频率补偿电路包括第二可切换偏置电流。 当第一和第二可切换偏置电流在睡眠模式下操作时，频率补偿电路将现有极点推向较高频率; 并且当第一和第二可切换偏置电流以活动模式操作时，产生左侧零点。 主动模式包括提供比睡眠模式中提供的电流大的电流的第一和第二可切换偏置电流。

公开(公告)号：US20160334902A1

公开(公告)日：2016-11-17

申请号：US14870243

申请日：2015-09-30

Applicant: SYNAPTICS INCORPORATED

Inventor： Zheming LI ,  Saikrishna GANTA ,  Tae-Song CHUNG ,  Rafael BETANCOURT ,  John Michael WEINERTH ,  Farzaneh SHAHROKHI

IPC: G06F3/044 ,  G06F3/041 ,  G06F3/01

CPC classification number: G06F3/044 ,  G06F3/016 ,  G06F3/0416 ,  G06F2203/04108

Abstract: A capacitance measurement circuit cancels background capacitance while reducing charge leakage and supply ripples during reset phases and integrate phases. The capacitance measurement circuit operates a first switch into a linear mode causing a first resistance in the first switch, and after a delay, operates a second switch into a saturation mode causing a second resistance in parallel to the first resistance.

Abstract translation: 电容测量电路消除背景电容，同时减少电荷泄漏并在复位阶段提供纹波并整合相位。 电容测量电路将第一开关操作成线性模式，导致第一开关中的第一电阻，并且在延迟之后，将第二开关操作为饱和模式，使得与第一电阻平行的第二电阻。