公开(公告)号：US10018468B2

公开(公告)日：2018-07-10

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 ,  G01C19/5776 ,  G01P15/097

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.

公开(公告)号：US10359285B2

公开(公告)日：2019-07-23

申请号：US15219446

申请日：2016-07-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hideyuki Murakami ,  Takashi Kawai ,  Masaki Nakamura

IPC: G01C19/5776

Abstract: An angular velocity sensor including a vibration body having a sensor electrode, a driving electrode, and a monitor electrode. The monitor electrode generates a signal according to vibration of the vibration body. The sensor circuit outputs a signal representing an angular velocity applied to the vibration body. The amplitude determination circuit measures amplitude of vibration of the vibration body. A PLL circuit includes a constant voltage source for generating a constant voltage, a timing switching unit for outputting a voltage by switching selectively between the constant voltage and a voltage corresponding to the monitor signal, and a voltage-controlled oscillator for outputting an oscillation signal having a frequency corresponding to the voltage output from the timing switching unit. When the amplitude measured is smaller than a predetermined value, the timing switching unit outputs the constant voltage output from the constant voltage source and outputs a start-up mode signal.