CIRCUIT FOR MEASURING ACCELERATION OF THREE-AXIS ACCELERATION SENSOR

• US 20140305212A1
• Filed: 10/03/2013
• Published: 10/16/2014
• Est. Priority Date: 04/12/2013
• Status: Abandoned Application

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: KIM, Chang Hyun
• Application Number:
  US14/045,313
• Publication Number:
  US 20140305212A1
• Time in Patent Office: Days
• US Class Current: 73/514.33
• CPC Class Codes: G01P 15/123 by piezo-resistive elements, e.g. semiconductor strain gauges
• CPC Class Codes: G01P 15/18 in two or more dimensions

Abstract

Disclosed herein is a circuit for measuring acceleration of a three-axis acceleration sensor. The circuit for measuring acceleration of a three-axis acceleration sensor includes: three-axis acceleration sensors connected to one another in parallel and sensing the respective accelerations applied to three axes directions of X, Y, and Z axes to output corresponding signals; a demultiplexer outputting three axes signals each output from the three-axis acceleration sensors through a single path; and an amplifier amplifying the output signal from the demultiplexer, and further includes, at a back-end of the amplifier, a multiplexer distributing a signal output from the amplifier to the respective axes, a sample and hold circuit unit sampling and storing an analog signal of each axis output from the multiplexer, and an analog-to-digital converter converting an analog signal output from the amplifier into a digital signal.

Claims

1. A circuit for measuring acceleration of a three-axis acceleration sensor, comprising:

three-axis acceleration sensors connected to one another in parallel and sensing the respective accelerations applied to three axes directions of X, Y, and Z axes to output corresponding signals;

a demultiplexer outputting three axes signals each output from the three-axis acceleration sensors through a single path; and

an amplifier amplifying the output signal from the demultiplexer.

2. The circuit for measuring acceleration of a three-axis acceleration sensor according to claim 1, wherein the demultiplexer has a switch for supplying a driving voltage and switches for opening and closing an output terminal of the three-axis acceleration sensor 220b configured of an interworking structure so that a voltage for driving the three-axis acceleration sensor is applied or blocked to the three-axis acceleration sensor, and the output terminal of the three-axis acceleration sensor is closed or opened.

3. The circuit for measuring acceleration of a three-axis acceleration sensor according to claim 1, further comprising, at an output terminal of the amplifier, a multiplexer distributing a signal output from the amplifier to the respective axes and a sample and hold circuit unit sampling and storing an analog signal of each axis output from the multiplexer.

4. A circuit for measuring acceleration of a three-axis acceleration sensor, comprising:

three-axis acceleration sensors connected to one another in parallel and sensing the respective accelerations applied to three axes directions of X, Y, and Z axes to output corresponding signals;

a demultiplexer outputting three axes signals each output from the three-axis acceleration sensors through a single path;

an amplifier amplifying the output signal from the demultiplexer; and

an analog-to-digital converter receiving an analog signal output from the amplifier, converting the analog signal into a digital signal, and outputting the digital signal.

5. The circuit for measuring acceleration of a three-axis acceleration sensor according to claim 4, wherein the demultiplexer has a switch for supplying a driving voltage and switches for opening and closing an output terminal of the three-axis acceleration sensor 220b configured of an interworking structure so that a voltage for driving the three-axis acceleration sensor is applied or blocked to the three-axis acceleration sensor, and the output terminal of the three-axis acceleration sensor is closed or opened.

6. The circuit for measuring acceleration of a three-axis acceleration sensor according to claim 4, wherein the amplifier is further installed with an offset rejection circuit for rejecting an offset in the case in which the three-axis acceleration sensor has the offset.

7. The circuit for measuring acceleration of a three-axis acceleration sensor according to claim 4, further comprising, between the amplifier and the analog-to-digital converter, a multiplexer distributing a signal output from the amplifier to the respective axes and a sample and hold circuit unit sampling and storing an analog signal of each axis output from the multiplexer.

8. The circuit for measuring acceleration of a three-axis acceleration sensor according to claim 7, wherein the sample and hold circuit unit is further provided with a low pass filter unit for removing a high frequency noise mixed in the output signal of the three-axis acceleration sensor received through the multiplexer.

9. The circuit for measuring acceleration of a three-axis acceleration sensor according to claim 7, wherein a second demultiplexer receiving three axes signals from the sample and hold circuit unit and outputting the three axes signals through a single path is further installed between the sample and hold circuit unit and the analog-to-digital converter.