Oscillator, electronic apparatus, and vehicle

Patent metadata

Field	Value
Publication number	US-11115028-B2
Application number	US-202016809159-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Mar 5, 2019
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

Provided is an oscillator including: a first resonator; a second resonator; a first oscillation circuit generating a first oscillation signal by oscillating the first resonator; a second oscillation circuit generating a second oscillation signal that has frequency-temperature characteristics different from frequency-temperature characteristics of the first oscillation signal by oscillating the second resonator; a clock signal generation circuit generating a clock signal with a frequency that is temperature compensated by temperature compensation data; a storage unit storing information on a learned model that is machine-learned to output data corresponding to the temperature compensation data with respect to input data; and a processing circuit obtaining the temperature compensation data by performing processing based on the information on the learned model with respect to the input data based on the first oscillation signal and the second oscillation signal.

First claim

What is claimed is:

1. An oscillator comprising:
a first resonator;
a second resonator;
a first oscillation circuit generating a first oscillation signal by oscillating the first resonator;
a second oscillation circuit generating a second oscillation signal that has frequency-temperature characteristics different from frequency-temperature characteristics of the first oscillation signal by oscillating the second resonator;
a clock signal generation circuit generating a clock signal with a frequency that is temperature compensated by temperature compensation data;
a storage unit storing information on a learned model that is machine-learned to output data corresponding to the temperature compensation data with respect to input data; and
a processing circuit obtaining the temperature compensation data by performing processing based on the information on the learned model with respect to the input data based on the first oscillation signal and the second oscillation signal,
wherein the processing circuit obtains frequency difference data representing a difference between a frequency of the first oscillation signal and a frequency of the second oscillation signal based on the first oscillation signal and the second oscillation signal, and performs processing based on the information on the learned model using the frequency difference data as the input data.

2. The oscillator according to claim 1 , wherein
the processing circuit includes
a measurement circuit that receives the first oscillation signal and the second oscillation signal, and
a calculation circuit that receives measurement data of the measurement circuit as the input data and obtains the temperature compensation data based on the information on the learned model,

the processing circuit outputs setting data corrected by the temperature compensation data to the clock signal generation circuit, and
the clock signal generation circuit generates the clock signal based on the setting data.

3. The oscillator according to claim 1 , wherein
the clock signal generation circuit includes a fractional N-type PLL circuit, and
the processing circuit outputs division ratio setting data corrected by the temperature compensation data to a dividing circuit included in the PLL circuit.

4. The oscillator according to claim 3 , wherein
the PLL circuit includes
a phase comparison circuit that performs a phase comparison between an input clock signal based on the first oscillation signal and a feedback clock signal from the dividing circuit,
a control voltage generation circuit that generates a control voltage based on a result of the phase comparison, and
a voltage controlled oscillation circuit that generates an output clock signal with a frequency corresponding to the control voltage.

5. The oscillator according to claim 1 , wherein
the clock signal generation circuit includes a direct digital synthesizer, and
the processing circuit outputs frequency setting data corrected by the temperature compensation data to the direct digital synthesizer.

6. The oscillator according to claim 1 , wherein
the clock signal generation circuit includes
a D/A conversion circuit that D/A converts frequency setting data and outputs a control voltage of a frequency and
a voltage controlled oscillation circuit that oscillates a third resonator at a frequency corresponding to the control voltage from the D/A conversion circuit, and

the processing circuit outputs the frequency setting data corrected by the temperature compensation data to the D/A conversion circuit.

7. The oscillator according to claim 1 , wherein
the processing circuit
obtains first temperature compensation data by performing polynomial approximation correction processing based on the input data,
obtains second temperature compensation data corresponding to a correction residual of the polynomial approximation correction processing based on the information on the learned model, and
obtains the temperature compensation data by performing adding processing of the first temperature compensation data and the second temperature compensation data.

8. The oscillator according to claim 1 , further comprising:
an interface circuit outputting the input data to an outside.

9. The oscillator according to claim 8 , wherein
the learned model is machine-learned based on the input data output from the interface circuit and a frequency measurement result of the clock signal.

10. The oscillator according to claim 1 , wherein
the processing circuit performs neural network calculation processing as the processing based on the information on the learned model.

11. An electronic apparatus comprising:
the oscillator according to claim 1 ; and
a processing device that operates based on the clock signal from the oscillator.

12. A vehicle comprising:
the oscillator according to claim 1 ; and
a processing device that operates based on the clock signal from the oscillator.

13. An oscillator comprising:
a first resonator;
a second resonator;
a first oscillation circuit generating a first oscillation signal by oscillating the first resonator;
a second oscillation circuit generating a second oscillation signal that has frequency-temperature characteristics different from frequency-temperature characteristics of the first oscillation signal by oscillating the second resonator;
a clock signal generation circuit generating a clock signal with a frequency that is temperature compensated by temperature compensation data;
a storage unit storing information on a learned model that is machine-learned to output data corresponding to the temperature compensation data with respect to input data; and
a processing circuit obtaining the temperature compensation data by performing processing based on the information on the learned model with respect to the input data based on the first oscillation signal and the second oscillation signal,
wherein the processing circuit performs first count processing based on the first oscillation signal, performs second count processing based on the second oscillation signal in a period set by the first count processing, and performs processing based on the information on the learned model using a count value of the second count processing as the input data.

14. An oscillator comprising:
a first resonator;
a second resonator;
a first oscillation circuit generating a first oscillation signal by oscillating the first resonator;
a second oscillation circuit generating a second oscillation signal that has frequency-temperature characteristics different from frequency-temperature characteristics of the first oscillation signal by oscillating the second resonator;
a clock signal generation circuit generating a clock signal with a frequency that is temperature compensated by temperature compensation data;
a storage unit storing information on a learned model that is machine-learned to output data corresponding to the temperature compensation data with respect to input data; and
a processing circuit obtaining the temperature compensation data by performing processing based on the information on the learned model with respect to the input data based on the first oscillation signal and the second oscillation signal,
wherein the processing circuit performs reference clock count processing based on a reference clock signal, performs first count processing based on the first oscillation signal and second count processing based on the second oscillation signal in a period set by the reference clock count processing, and performs processing based on the information on the learned model using a

Assignees

• Seiko Epson Corp

Inventors

• Sudo Yasuhiro

Classifications

• H03K3/03

  Astable circuits · CPC title

• H03K3/011

  Modifications of generator to compensate for variations in physical values, e.g. voltage, temperature {(to maintain energy constant H03K3/015)} · CPC title

• H03B5/04 Primary

  Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature · CPC title

• H03L1/026 Primary

  by using a memory for digitally storing correction values (H03L1/025 takes precedence) · CPC title

• H03L7/18

  using a frequency divider or counter in the loop (H03L7/20, H03L7/22 take precedence) · CPC title