Data correction for a sensor

Patent metadata

Field	Value
Publication number	US-10948515-B2
Application number	US-201615374898-A
Country	US
Kind code	B2
Filing date	Dec 9, 2016
Priority date	Dec 9, 2016
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A device may include a sensor, a sampling unit, and an interpolator. The sensor may be configured to sense motion and output a sensed signal. The sampling unit may be configured to sample the sensed signal with a sensor clocking signal to generate a plurality of sampled values. The interpolator may be coupled to the sampling unit and may be configured to receive the plurality of sampled values, the sensor clocking signal, and a reference clocking signal external to the device. The interpolator may be configured to interpolate the plurality of sampled values based on the reference clocking signal and further based on the sensor clocking signal to generate a plurality of output values.

First claim

What is claimed is:

1. A device comprising:
a sensor includes a drive circuitry and a sense circuitry, the sensor configured to sense motion and output a sensed signal, wherein the sense circuitry includes:
a sampling unit configured to receive and sample the sensed signal with a sensor clocking signal received from the drive circuitry to generate a plurality of sampled values; and
an interpolator within the sense circuitry configured to receive the plurality of sampled values from the sampling unit, and wherein the interpolator is further configured to receive the sensor clocking signal and a reference clocking signal external to the device, and wherein the interpolator is configured to interpolate the plurality of sampled values based on the reference clocking signal and further based on the sensor clocking signal to generate a plurality of estimated sampled values.

2. The device as described by claim 1 , wherein an estimated sampled value of the plurality of estimated sampled values is between two consecutive sampled values of the plurality of sampled values.

3. The device as described by claim 1 , wherein the sensor is a gyroscope.

4. The device as described by claim 1 , wherein the interpolator is a first order interpolator.

5. The device as described by claim 1 , wherein the interpolator is a zero order interpolator.

6. The device as described by claim 1 , wherein the interpolator is a second order interpolator.

7. The device as described by claim 1 , wherein the interpolator is configured to convert the plurality of sampled values from a time domain associated with the sensor clocking signal to another time domain associated with the reference clocking signal.

8. The device as described by claim 1 , wherein the plurality of estimated sampled values is transmitted to a host processor that is positioned outside of the device.

9. The device as described by claim 1 further comprising:
a phase locked loop configured to lock onto resonance frequency of the sensor and further configured to output the sensor clocking signal to the sampling unit.

10. The device as described by claim 1 , wherein the sampling unit is a decimator.

11. The device as described by claim 1 , wherein the reference clocking signal is selected from a group consisting of a real time clock and a system clock.

12. The device as described by claim 1 , wherein the referencing clocking signal is used to timestamp the plurality of sampled values.

13. A system comprising:
a sensor chip including:
a sense component configured to sense motion and output a sensed signal;
a drive circuitry and a sense circuitry, wherein the sense circuitry includes:
a sampling unit configured to receive and sample the sensed signal with a sensor clocking signal received from the drive circuitry to generate a plurality of sampled values; and
an interpolator within the sense circuitry configured to receive the plurality of sampled values from the sampling unit, and wherein the interpolator is further configured to receive the sensor clocking signal and a reference clocking signal external to the sensor chip, and wherein the interpolator is configured to interpolate the plurality of sampled values based on the reference clocking signal and further based on the sensor clocking signal to generate a plurality of estimated sampled values; and

a host processor external to the sensor chip, wherein the host processor operates by the reference clocking signal and is configured to receive the interpolated plurality of estimated sampled values from the sensor chip, wherein a correction to a frequency or sampling error is made by the sensor chip to reduce power consumption by the host processor.

14. The system as described by claim 13 , wherein an output value of the plurality of estimated sampled values temporally occurs between two consecutive sampled values of the plurality of sampled values.

15. The system as described by claim 13 , wherein the sensor is a gyroscope.

16. The system as described by claim 13 , wherein the interpolator is selected from a group consisting of a first order interpolator and a second order interpolator.

17. The system as described by claim 13 , wherein the interpolator is configured to convert the plurality of sampled values from a time domain associated with the sensor clocking signal to another time domain associated with the reference clocking signal.

18. The system as described by claim 13 further comprising:
a phase locked loop configured to lock onto resonance frequency of the sensor and further configured to output the sensor clocking signal to the sampling unit.

19. The system as described by claim 13 , wherein the sampling unit is a decimator.

20. A method comprising:
sensing a motion to generate a sensed signal;
sampling the sensed signal, within a sense circuitry, with a sensor clocking signal received from a drive circuitry to generate a plurality of sampled values, wherein the sensor clocking signal is received from environment within a sensor chip;
receiving a reference clock signal, wherein the reference clock signal is received from external environment of the sensor chip; and
interpolating the plurality of sampled values within the sense circuitry based on the sensor clocking signal and the reference clock signal to generate an interpolated value.

21. The method as described by claim 20 further comprising:
transmitting the interpolated value to a host processor that is external to the sensor chip.

22. The method as described by claim 20 , wherein the interpolating is through a second order interpolator.

23. The method as described by claim 20 , wherein the interpolating corrects frequency and sampling errors associated with the sensor clocking signal, and wherein the interpolating makes the correction within the environment of the sensor chip at a lower power consumption in comparison to correction within a host processor that is external to the sensor chip.

Assignees

• Invensense Inc
• Invensease Inc

Inventors

• Dakshinamurthy Sriraman
• Perrott Michael
• Malipatil Amaresh
• Keal William Kerry
• Milota Andy F

Classifications

• G01P15/08

  with conversion into electric or magnetic values · CPC title

• G01P21/00 Primary

  Testing or calibrating of apparatus or devices covered by the preceding groups · CPC title

• G01C19/5776

  Signal processing not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719 · CPC title