Circuit device, oscillator, physical quantity measurement device, electronic apparatus, and vehicle

• US 10,742,221 B2
• Filed: 01/19/2018
• Issued: 08/11/2020
• Est. Priority Date: 01/24/2017
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Usuda, Toshiya, Kamiyama, Masayuki
• Primary Examiner(s): Gannon, Levi
• Application Number:
  US15/875,006
• Publication Number:
  US 20180212609A1
• Time in Patent Office: 935 Days
• Field of Search: 331 66, 331154, 331158, 331176
• CPC Class Codes: H03B 5/366 and comprising means for varying the frequency by a variable voltage or current
• CPC Class Codes: H03L 1/025 and a memory for digitally storing correction values
• CPC Class Codes: H03L 1/026 by using a memory for digitally storing correction values H03L1/025 takes precedence
• CPC Class Codes: H03L 1/028 of generators comprising piezoelectric resonators H03L1/021, H03L1/022 take precedence; oscillation generators with a piezoelectric resonator H03B5/32
• CPC Class Codes: H04L 9/3278 using physically unclonable functions [PUF]

Abstract

A circuit device includes an oscillation circuit that generates an oscillation signal by using an resonator, a processing circuit that controls the oscillation circuit, and a storage circuit that stores temperature compensation data of an oscillation frequency of the oscillation signal. The processing circuit generates specific PUF information of the circuit device on the basis of the temperature compensation data.

Claims

1. A circuit device comprising:

an oscillation circuit configured to generate an oscillation signal;

a processing circuit configured to control the oscillation circuit; and

a storage circuit configured to store temperature compensation data of an oscillation frequency of the oscillation signal,

wherein the processing circuit generates specific Physically Unclonable Function information of the circuit device based on the temperature compensation data,

wherein the circuit device outputs the Physically Unclonable Function information as generated by the processing circuit to an external device that is configured to use the Physically Unclonable Function information to perform an authentication of the circuit device,

wherein the temperature compensation data corresponds to adjustment data, wherein the adjustment data is a change in a capacitance value, wherein the capacitance value has a temperature characteristic having a secondary function, and wherein the adjustment data includes at least first adjustment data that is stored in a first address of a plurality of addresses indexed to a first temperature less than a peak temperature of the temperature characteristic, second adjustment data that is stored in a second address of the plurality of addresses indexed to a second temperature greater than the peak temperature of the temperature characteristic, and third adjustment data that is stored in a third address of a plurality of addresses indexed to a third temperature between the first temperature and the second temperature, and

wherein the processing circuit generates the specific Physically Unclonable Function information by retrieving at least two of the first adjustment data, the second adjustment data, and the third adjustment data.

2. The circuit device according to claim 1, further comprising:

an encoding processing circuit configured to perform an encoding process based on the specific Physically Unclonable Function information.

3. The circuit device according to claim 1,

wherein the processing circuit extracts data of a predetermined number of bits from the temperature compensation data to generate the specific Physically Unclonable Function information.

4. The circuit device according to claim 2,

wherein the processing circuit extracts data of a predetermined number of bits from the temperature compensation data to generate the specific Physically Unclonable Function information.

5. The circuit device according to claim 1,

wherein the oscillation circuit includes a variable capacitance circuit for temperature compensation, and

wherein the adjustment data is data for adjusting the capacitance value of the variable capacitance circuit.

6. The circuit device according to claim 2,

wherein the oscillation circuit includes a variable capacitance circuit for temperature compensation, and

wherein the adjustment data is data for adjusting the capacitance value of the variable capacitance circuit.

7. The circuit device according to claim 3,

wherein the oscillation circuit includes a variable capacitance circuit for temperature compensation, and

wherein the adjustment data is data for adjusting the capacitance value of the variable capacitance circuit.

8. The circuit device according to claim 4,

wherein the oscillation circuit includes a variable capacitance circuit for temperature compensation, and

wherein the adjustment data is data for adjusting the capacitance value of the variable capacitance circuit.

9. The circuit device according to claim 1, further comprising:

a clock module configured to generate clocking data based on the oscillation signal, the clocking data being real-time clock information; and

an interface circuit configured to output the clocking data to an external device.

10. The circuit device according to claim 2, further comprising:

a clock module configured to generate clocking data based on the oscillation signal, the clocking data being real-time clock information; and

an interface circuit configured to output the clocking data to an external device.

11. The circuit device according to claim 3, further comprising:

a clock module configured to generate clocking data based on the oscillation signal, the clocking data being real-time clock information; and

an interface circuit configured to output the clocking data to an external device.

12. The circuit device according to claim 5, further comprising:

a clock module configured to generate clocking data based on the oscillation signal, the clocking data being real-time clock information; and

an interface circuit configured to output the clocking data to an external device.

13. An oscillator comprising:

the circuit device according to claim 1; and

a resonator.

14. A physical quantity measurement device comprising:

the circuit device according to claim 1; and

a resonator.

15. An electronic apparatus comprising the circuit device according to claim 1.

16. A vehicle comprising the circuit device according to claim 1.