Title:
EXCITATION DEVICE
Document Type and Number:
Japanese Patent JP2015021781
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an excitation device for exciting a test piece with pulse width modulation (PWM) drive signals that can reduce the effect of noise.SOLUTION: In a gyro sensor, a time to digital converter (TDC) 51 detects the amplitude of a vibrator 11, and a drive circuit 50 (except the TDC 51) determines the duty ratio of PWM drive signals, so that an amplitude has a predetermined size corresponding to the amplitude of the vibrator 11, to output PWM drive signals having the duty ratio. The drive circuit 50 (except the TDC 51) includes: a control circuit 52 that outputs a control value in accordance with the duty ratio of target PWM drive signals; and digitally controlled oscillator (DCO) 53 that performs clocking based on a gate delay time in response to the control value and therefore generates PWM drive signals having a pulse width corresponding to an input control value to output PWM drive signals.
Inventors:
YAMAUCHI SHIGENORI
WATANABE TAKAMOTO
TAGUCHI NOBUYUKI
WATANABE TAKAMOTO
TAGUCHI NOBUYUKI
Application Number:
JP2013148538A
Publication Date:
February 02, 2015
Filing Date:
July 17, 2013
Export Citation:
Assignee:
DENSO CORP
International Classes:
G01C19/5726; G01C19/5747; H01L29/84; H03K7/08
Domestic Patent References:
| JP2010185714A | 2010-08-26 | |||
| JPH0746094A | 1995-02-14 | |||
| JP2010091415A | 2010-04-22 | |||
| JPH11177427A | 1999-07-02 | |||
| JPH07183800A | 1995-07-21 | |||
| JP2010169532A | 2010-08-05 |
Attorney, Agent or Firm:
Nagoya international patent business corporation