FTR loop of a gyro apparatus

Patent metadata

Field	Value
Publication number	US-11243078-B2
Application number	US-201916361680-A
Country	US
Kind code	B2
Filing date	Mar 22, 2019
Priority date	Mar 22, 2019
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A signal processing circuit for a gyroscope apparatus is disclosed. The signal processing circuit includes a first electrode and a second electrode pairing with the first electrode. The signal processing circuit, being a negative feedback loop circuit, is configured to be connected with the first electrode and the second electrode and comprises a demodulator configured to convert a current from the first electrode into a voltage and demodulate the converted voltage to output a demodulated signal, an analog-to-digital converter configured to convert the demodulated signal from the demodulator into a digital signal, a proportional-integral-derivative controller that is connected to the analog-to-digital converter, a digital-to-analog converter configured to convert an output signal from the proportional-integral-derivative controller to an analog signal, and a modulator configured to be electrically connected with the second electrode and to be electrically connected with the digital-to-analog converter.

First claim

What is claimed is:

1. A signal processing circuit for a gyroscope apparatus including a first electrode and a second electrode pairing with the first electrode, the signal processing circuit being a negative feedback loop circuit configured to be connected with the first electrode and the second electrode, comprising:
a demodulator configured to convert a current from the first electrode into a voltage and demodulate the converted voltage to output a demodulated signal;
an analog-to-digital converter configured to convert the demodulated signal from the demodulator into a digital signal;
a proportional-integral-derivative controller that is connected to the analog-to-digital converter;
a digital-to-analog converter configured to convert an output signal from the proportional-integral-derivative controller to an analog signal; and
a modulator configured to be electrically connected with the second electrode and to be electrically connected with the digital-to-analog converter,
wherein the modulator includes a first transimpedance amplifier, a first mixer, and a voltage-to-current amplifier, and the first mixer is a pair of switches that are switched with a square-wave rail-to-rail signal.

2. The signal processing circuit according to claim 1 , wherein the demodulator includes a second transimpedance amplifier, a voltage-to-voltage amplifier, and a second mixer configured to demodulate the converted voltage and outputting to the analog-to-digital converter.

3. The signal processing circuit according to claim 1 , wherein the analog-to-digital converter is a 1 bit, 3rd-order continuous-time sigma delta modulator.

4. The signal processing circuit according to claim 1 , wherein the digital-to-analog converter is a 1 bit, 3rd-order digital sigma delta modulator.

5. The signal processing circuit according to claim 1 , wherein the proportional-integral-derivative controller fixes a digital gain based on a quality factor of the gyroscope.

6. The signal processing circuit according to claim 1 , wherein the proportional-integral-derivative controller is a digital proportional-integral-derivative controller.

7. A signal processing circuit for a gyroscope apparatus including a first electrode and a second electrode pairing with the first electrode, the signal processing circuit being a negative feedback loop circuit configured to be connected with the first electrode and the second electrode, comprising:
a demodulator configured to convert a current from the first electrode into a voltage and demodulate the converted voltage to output a demodulated signal;
an analog-to-digital converter configured to convert the demodulated signal from the demodulator into a digital signal;
a proportional-integral-derivative controller that is connected to the analog-to-digital converter;
a digital-to-analog converter configured to convert an output signal from the proportional-integral-derivative controller to an analog signal;
a modulator configured to be electrically connected with the second electrode and to be electrically connected with the digital-to-analog converter;
a filter electrically connecting with the digital-to-analog converter and the modulator, wherein
the proportional-integral-derivative controller completely converts the digital signal converted by the analog-to-digital converter to a multi-bit digital data and outputs the multi-bit digital data to the digital-to-analog converter,
the filter receives the analog signal from the digital-to-analog converter and is configured to reshape the analog signal,
the filter is further configured to filter a quantization noise from the reshaped analog signal, and
the filter is a 2nd-order switched capacitor filter.

8. The signal processing circuit according to claim 7 , wherein the demodulator includes a first transimpedance amplifier, a voltage-to-voltage amplifier, and a first mixer configured to demodulate the converted voltage and outputting to the analog-to-digital converter.

9. The signal processing circuit according to claim 7 , wherein the analog-to-digital converter is a 1 bit, 3rd-order continuous-time sigma delta modulator.

10. The signal processing circuit according to claim 7 , wherein the digital-to-analog converter is a 1 bit, 3rd-order digital sigma delta modulator.

11. The signal processing circuit according to claim 7 , wherein the proportional-integral-derivative controller fixes a digital gain based on a quality factor of the gyroscope.

12. The signal processing circuit according to claim 7 , wherein the proportional-integral-derivative controller is a digital proportional-integral-derivative controller.

13. A signal processing circuit for a gyroscope apparatus including a first electrode and a second electrode pairing with the first electrode, the signal processing circuit being a negative feedback loop circuit configured to be connected with the first electrode and the second electrode, comprising:
a demodulator configured to convert a current from the first electrode into a voltage and demodulate the converted voltage to output a demodulated signal;
an analog-to-digital converter configured to convert the demodulated signal from the demodulator into a digital signal;
a proportional-integral-derivative controller that is connected to the analog-to-digital converter;
a digital-to-analog converter configured to convert an output signal from the proportional-integral-derivative controller to an analog signal;
a modulator configured to be electrically connected with the second electrode and to be electrically connected with the digital-to-analog converter; and
a filter configured to reduce a shaped quantization noise of the demodulated signal from the demodulator before outputting to the proportional-integral-derivative controller,
wherein the filter is a cascaded integrator-comb filter without a decimator.

14. The signal processing circuit according to claim 13 , wherein the demodulator includes a first transimpedance amplifier, a voltage-to-voltage amplifier, and a first mixer configured to demodulate the converted voltage and outputting to the analog-to-digital converter.

15. The signal processing circuit according to claim 13 , wherein the analog-to-digital converter is a 1 bit, 3rd-order continuous-time sigma delta modulator.

16. The signal processing circuit according to claim 13 , wherein the digital-to-analog converter is a 1 bit, 3rd-order digital sigma delta modulator.

17. The signal processing circuit according to claim 13 , wherein the proportional-integral-derivative controller fixes a digital gain based on a quality factor of the gyroscope.

18. The signal processing circuit according to claim 13 , wherein the proportional-integral-derivative controller is a digital proportional-integral-derivative controller.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• CHE Chihchuan
• Jeong Yaesuk

Classifications

• G01C19/5776 Primary

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

• H03M1/0626

  by filtering · CPC title

• H03M1/822

  using pulse width modulation · CPC title

• H03M1/504

  using pulse width modulation · CPC title

• G01C19/5698

  using acoustic waves, e.g. surface acoustic wave gyros · CPC title