公开(公告)号：US20180041217A1

公开(公告)日：2018-02-08

申请号：US15549392

申请日：2016-04-11

Applicant: Panasonic Intellectual Property Management Co. Ltd.

Inventor： HIDEYUKI MURAKAMI ,  TAKESHI UEMURA

IPC: H03L5/00 ,  H03L7/06 ,  H03B5/36

CPC classification number: H03L5/00 ,  G01C19/5614 ,  G01C19/5776 ,  H03B5/364 ,  H03L7/06 ,  H03L7/091 ,  H03L2207/50

Abstract: A drive circuit is configured to drive an oscillator to vibrate the oscillator that outputs a monitor signal according to a physical quantity. The drive circuit includes a drive signal generating unit that generates a drive signal having a drive frequency, a phase difference detector that detects a phase difference between the monitor signal and the drive signal, a frequency controller that controls the drive frequency based on the phase difference, automatic gain control (AGC) unit that controls an amplitude of the drive signal according to an amplitude of the monitor signal, and an output unit that outputs the drive signal having the controlled amplitude to the oscillator. This drive circuit can stably drive and vibrate the oscillator.

公开(公告)号：US20160187136A1

公开(公告)日：2016-06-30

申请号：US14911253

申请日：2014-10-23

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： HIDEYUKI MURAKAMI ,  TAKASHI KAWAI

IPC: G01C19/5614

CPC classification number: G01C19/5614 ,  G01C19/5776 ,  G01P15/097

Abstract: A physical-quantity sensor is configured to be used with a physical-quantity sensor element that outputs a sensor signal in response to a physical quantity. A physical-quantity detection circuit of the physical-quantity sensor includes a signal generating unit for generating a detecting signal and a multiplier that multiplies the sensor signal by the detecting signal. The signal generating unit converts a first phase of a predetermined signal having a frequency corresponding to a frequency of the sensor signal, into a second phase, and calculates an amplitude value corresponding to the second phase as to generate the detecting signal. This physical-quantity sensor improves accuracy of phase adjustment without increasing a sampling frequency.

Abstract translation: 物理量传感器被配置为与物理量传感器元件一起使用，所述物理量传感器元件响应于物理量输出传感器信号。 物理量传感器的物理量检测电路包括用于产生检测信号的信号产生单元和乘以传感器信号的检测信号的乘法器。 信号生成单元将具有与传感器信号的频率对应的频率的预定信号的第一相位转换为第二相位，并且计算与第二相位相对应的振幅值以产生检测信号。 该物理量传感器提高了相位调整的精度，而不增加采样频率。