CIRCUIT DEVICE, OSCILLATOR, ELECTRONIC APPARATUS, AND VEHICLE

• US 20190326855A1
• Filed: 04/23/2019
• Published: 10/24/2019
• Est. Priority Date: 04/24/2018
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: UNO, Tomohiro
• Granted Patent: US 10,771,011 B2
• Time in Patent Office: Days
• CPC Class Codes: H03B 2200/0008 Colpitts oscillator
• CPC Class Codes: H03B 2200/004 including a variable capacitance, e.g. a varicap, a varactor or a variable capacitance of a diode or transistor
• CPC Class Codes: H03B 5/04 Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
• CPC Class Codes: H03B 5/362 the amplifier being a single transistor H03B5/364 - H03B5/368 take precedence
• CPC Class Codes: H03B 5/368 the means being voltage variable capacitance diodes
• CPC Class Codes: H03L 1/023 by using voltage variable capacitance diodes
• CPC Class Codes: H03L 1/025 and a memory for digitally storing correction values
• CPC Class Codes: H03L 1/027 by using frequency conversion means which is variable with temperature, e.g. mixer, frequency divider, pulse add/substract logic circuit H03L1/023, H03L1/026 take 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: H03L 7/1976 using a phase accumulator for controlling the counter or frequency divider

Abstract

A circuit device includes a control voltage input terminal to which a control voltage is inputted, an A/D conversion circuit A/D-converting the control voltage to generate control voltage data and A/D-converting a temperature detection voltage from a temperature sensor to generate temperature detection data, a processing circuit generating temperature compensation data of an oscillation frequency based on the temperature detection data and performing addition processing of the temperature compensation data and the control voltage data to generate frequency control data of the oscillation frequency, and an oscillation signal generation circuit generating an oscillation signal of the oscillation frequency set by the frequency control data, using the frequency control data and a resonator.

Claims

1. A circuit device comprising:

an A/D conversion circuit that receives a control voltage and generates control voltage data, and receives a temperature detection voltage from a temperature sensor and generates temperature detection data;

a processing circuit that generates temperature compensation data based on the temperature detection data, and generates frequency control data by performing addition processing of the temperature compensation data and the control voltage data; and

an oscillation signal generation circuit that generates an oscillation signal of an oscillation frequency set by the frequency control data, using the frequency control data and a resonator.

2. The circuit device according to claim 1, wherein

the processing circuit performs correction processing on addition result data of the addition processing and outputs the frequency control data after the correction processing, and

the oscillation signal generation circuit includes

a D/A conversion circuit that receive the frequency control data after the correction processing and output a capacitance control voltage,

a variable capacitor whose capacitance is controlled based on the capacitance control voltage, and

an oscillation circuit that oscillates the resonator with the capacitance of the variable capacitor as a load capacitance to generate the oscillation signal.

3. The circuit device according to claim 1, wherein

the processing circuit performs conversion processing on the addition result data of the addition processing and outputs division ratio data as the frequency control data after the conversion processing, and

the oscillation signal generation circuit includes

an oscillation circuit that oscillates the resonator to generate a second oscillation signal, and

a fractional-N type PLL circuit having a dividing circuit in which a division ratio is set based on the division ratio data, comparing phases of a frequency division clock signal from the dividing circuit and the second oscillation signal, and generating the oscillation signal.

4. The circuit device according to claim 1, wherein

the circuit device has a first side, a second side opposite to the first side, a third side crossing the first side, and a fourth side opposite to the third side, and

when a direction from the first side to the second side is defined as a first direction and a direction from the third side to the fourth side is defined as a second direction,

the oscillation signal generation circuit is disposed on the first direction side of the A/D conversion circuit,

the processing circuit is disposed on the second direction side of the A/D conversion circuit and the oscillation signal generation circuit,

the A/D conversion circuit is disposed at a position having a shorter distance from the first side compared to a distance from the second side, and

the oscillation signal generation circuit is disposed at a position having a shorter distance from the second side compared to a distance from the first side.

5. The circuit device according to claim 4, wherein

a power supply circuit is disposed between the A/D conversion circuit and the oscillation signal generation circuit

6. The circuit device according to claim 5, wherein

the power supply circuit supplies a first power supply voltage to the A/D conversion circuit, supplies a second power supply voltage to the processing circuit, and supplies a third power supply voltage to the oscillation signal generation circuit.

7. The circuit device according to claim 4, further comprising a memory storing data to be used by the processing circuit, wherein

the memory is disposed between the processing circuit and the fourth side.

8. The circuit device according to claim 4, further comprising a digital interface terminal electrically coupled to the processing circuit, wherein

the digital interface terminal is disposed between the processing circuit and the fourth side.

9. The circuit device according to claim 4, further comprising a buffer circuit buffering the oscillation signal and outputting the oscillation signal to an outside, wherein

when an opposite direction of the second direction is defined as a third direction, the buffer circuit is disposed on the third direction side of the oscillation signal generation circuit.

10. The circuit device according to claim 4, further comprising an oven control circuit controlling a temperature of the resonator, wherein

when an opposite direction of the second direction is defined as a third direction, the oven control circuit is disposed on the third direction side of the A/D conversion circuit.

11. The circuit device according to claim 4, further comprising a PLL circuit generating and outputting a clock signal obtained by multiplying the oscillation signal, wherein

when an opposite direction of the second direction is defined as a third direction, the PLL circuit is disposed on the third direction side of the A/D conversion circuit.

13. An oscillator comprising

the circuit device according to claim 1, and

the resonator.

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

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

12. A circuit device comprising:

an A/D conversion circuit A/D-converting a temperature detection voltage from a temperature sensor to output temperature detection data;

processing circuit performing temperature compensation processing of an oscillation frequency based on the temperature detection data, to generate and output frequency control data of the oscillation frequency; and

an oscillation signal generation circuit generating an oscillation signal of the oscillation frequency set by the frequency control data, using the frequency control data and a resonator, wherein

the circuit device has a first side, a second side opposite to the first side, a third side crossing the first side, and a fourth side opposite to the third side, and

when a direction from the first side to the second side is defined as a first direction and a direction from the third side to the fourth side is defined as a second direction,

the oscillation signal generation circuit is disposed on the first direction side of the A/D conversion circuit,

the processing circuit is disposed on the second direction side of the A/D conversion circuit and the oscillation signal generation circuit,

the A/D conversion circuit is disposed at a position having a shorter distance from the first side compared to a distance from the second side, and

the oscillation signal generation circuit is disposed at a position having a shorter distance from the second side compared to a distance from the first side.