Oscillator, electronic apparatus and vehicle

Patent metadata

Field	Value
Publication number	US-11070212-B2
Application number	US-202016809186-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Mar 5, 2019
Publication date	Jul 20, 2021
Grant date	Jul 20, 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; and a processing circuit performing time digital conversion processing based on the first oscillation signal and the second oscillation signal, and obtaining the temperature compensation data based on measurement data of the time digital conversion processing.

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; and
a processing circuit performing time digital conversion processing based on the first oscillation signal and the second oscillation signal, and obtaining the temperature compensation data based on measurement data of the time digital conversion processing,
wherein the processing circuit
performs first time digital conversion processing for measuring a first time difference between a first edge timing and a second edge timing of the first oscillation signal,
performs second time digital conversion processing for measuring a second time difference between a third edge timing and a fourth edge timing of the second oscillation signal, and
obtains the temperature compensation data using data corresponding to a difference between the first time difference and the second time difference as the measurement data.

2. The oscillator according to claim 1 , further comprising:
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, wherein
the processing circuit obtains the temperature compensation data by performing processing based on the information on the learned model using the measurement data as the input data.

3. The oscillator according to claim 2 , wherein the processing circuit includes
a time digital conversion circuit that receives the first oscillation signal and the second oscillation signal, and performs the time digital conversion processing, and
a calculation circuit that receives the measurement data from the time digital conversion 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.

4. The oscillator according to claim 1 , wherein
the processing circuit includes
a first time digital converter that performs the first time digital conversion processing, and
a second time digital converter that performs the second time digital conversion processing.

5. The oscillator according to claim 1 , wherein
the processing circuit executes the first time digital conversion processing and the second time digital conversion processing in a time division manner.

6. 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.

7. 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.

8. 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 based on 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.

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

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

11. 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; and
a processing circuit performing time digital conversion processing based on the first oscillation signal and the second oscillation signal, and obtaining the temperature compensation data based on measurement data of the time digital conversion processing,
wherein the processing circuit
performs first time digital conversion processing for measuring a first time difference between a first edge timing and a second edge timing of the first oscillation signal,
performs second time digital conversion processing for measuring a second time difference between a third edge timing and a fourth edge timing of the second oscillation signal, and
obtains the temperature compensation data using the first time difference data and the second time difference data as the measurement data.

Assignees

• Seiko Epson Corp

Inventors

• Sudo Yasuhiro

Classifications

• G06N3/09

  Supervised learning · CPC title

• G06N3/0499

  Feedforward networks · CPC title

• G06N20/10

  using kernel methods, e.g. support vector machines [SVM] · CPC title

• G06F1/04 Primary

  Generating or distributing clock signals or signals derived directly therefrom · CPC title

• H03M1/66

  Digital/analogue converters ({H03M1/001 – } H03M1/10 take precedence) · CPC title