JP2015177259A - Oscillation circuit, oscillator, electronic apparatus, moving body and oscillator manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillation circuit, an oscillator, an electronic apparatus, a moving body and an oscillator manufacturing method, capable of improving inspection reliability of a vibrator.SOLUTION: An oscillation circuit 1 includes: an oscillation part 10 which includes a first terminal 11 and a second terminal 12 connected to a vibrator 100; a third terminal 13; a fourth terminal 14 to which power potential VDD is supplied; a first transistor T1 and a second transistor T2; a current mirror circuit 20 for outputting to the second terminal 12 a current which flows from the fourth terminal 14 to the second transistor T2, on the basis of a current which flows from the fourth terminal 14 to the first transistor T1; a first switchover unit 21 which controls an electrical connection between the first terminal 11 and the third terminal 13; and a second switchover unit 22 which controls a connection state (ON/OFF state) of the second transistor T2.

Description

  The present invention relates to an oscillation circuit, an oscillator, an electronic device, a moving object, and a method for manufacturing the oscillator.

  A vibrator such as a crystal vibrator (piezoelectric vibrator) or a MEMS (Micro Electro Mechanical Systems) vibrator applies a large current, voltage, or power AC signal to drive the vibrator, and the frequency characteristics of the vibrator. Drive level for testing fluctuations in the frequency characteristics, etc. of an oscillator by driving an oscillator by applying a signal that increases or decreases a large current, voltage, or power AC signal in stages. The characteristics of the vibrator are inspected by performing an inspection or the like.

  On the other hand, in order to reduce the size of an oscillator, an oscillator that accommodates a crystal resonator and an oscillation circuit in the same container has been developed. For this reason, various devices have been made to inspect the characteristics of the vibrator after the crystal vibrator and the oscillation circuit are mounted in the same container.

  Patent Document 1 has an inspection switch dedicated for testing the characteristics of a crystal resonator and an analog switch controlled by applying a specific DC voltage to a power input terminal. A crystal oscillator is disclosed in which a crystal resonator is conductively connected to a test terminal via an analog switch when a child is inspected, and is disconnected from the crystal resonator during normal operation of the oscillator.

  Patent Document 2 discloses a crystal oscillator in which the function terminal of the oscillator is also used as an inspection terminal of the crystal resonator.

  In Patent Document 2, the inspection terminal of the crystal resonator is also used as the output terminal and the standby terminal of the crystal oscillator, thereby reducing the size of the oscillator as compared with the configuration having the dedicated inspection terminal as in Patent Document 1. Is possible.

  In Patent Document 2, the reason why the output terminal and the standby terminal are selected as the terminals used for the inspection of the crystal resonator is that when the characteristics of the crystal resonator are inspected, the switching circuit is controlled by the power supply voltage. It is thought that it is done.

  In order to stabilize the operation of the switching circuit, it is necessary to apply a highly stable potential to the power supply terminal and the ground terminal (ground terminal). If these terminals are also used as crystal inspection terminals, the power supply voltage becomes unstable because the signal of the crystal resonator is superimposed on the DC voltage. Therefore, the crystal resonator is limited to the output terminal and the standby terminal as two terminals.

JP 2001-102870 A JP 2009-201097 A

In both Patent Document 1 and Patent Document 2, when testing a vibrator, in addition to two crystal testing terminals connected to the vibrator, a power supply terminal and a ground terminal for controlling an analog switch and a switching circuit. Therefore, it is necessary to manage the connection between the electrodes electrically connected to these four terminals and the probe. As the number of connection points to be managed increases, the possibility of inspection failure due to connection failure increases, and the reliability of the inspection of the vibrator may decrease.

  The present invention has been made in view of the above technical problems. According to some aspects of the present invention, it is possible to provide an oscillation circuit, an oscillator, an electronic device, a moving body, and a method for manufacturing an oscillator that can improve the reliability of the inspection of the vibrator.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following aspects or application examples.

[Application Example 1]
The oscillation circuit according to this application example includes an oscillation unit having a first terminal and a second terminal connected to the vibrator, a third terminal, a fourth terminal to which a power supply potential is supplied, a first transistor, and a second transistor. A current mirror circuit having a transistor and outputting a current flowing from the fourth terminal to the second transistor to the second terminal based on a current flowing from the fourth terminal to the first transistor; and the first terminal And an oscillation circuit including a first switching unit that switches an electrical connection between the first terminal and the third terminal, and a second switching unit that switches a connection state of the second transistor.

  According to this application example, for example, by supplying a voltage signal for inspecting the vibrator between the third terminal and the fourth terminal, for example, an overdrive inspection or a drive level inspection of the vibrator Inspection of characteristics can be performed. During the normal operation of the oscillation circuit and the inspection of the vibrator, the fourth terminal can be shared as a terminal to which the power supply potential is supplied and a terminal to which a voltage signal for inspecting the vibrator is supplied. Compared to the case where terminals are provided, the number of terminals used for inspection can be reduced. Therefore, for example, it is possible to reduce the possibility of a test failure due to a poor electrical connection between the probe for inputting the test signal and the terminal on the oscillation circuit side. An oscillation circuit can be realized. In addition, a voltage signal for inspecting the characteristics of the vibrator can be supplied to the vibrator via the third terminal and the fourth terminal without going through the oscillation section. Compared to the case of supply, there are fewer restrictions on the magnitude of the voltage signal. In addition, since the inspection-dedicated terminal is shared with the terminal for normal operation, the number of terminals can be reduced, and the oscillation circuit can be downsized.

[Application Example 2]
In the above-described oscillation circuit, the third terminal may be a terminal to which a ground potential is supplied.

  The wiring connected to the third terminal to which the ground potential is supplied is generally designed to be thick, and no element other than the first switching unit is disposed between the third terminal and the first terminal. Is common. Therefore, a resistance component other than the first switching unit is reduced between the third terminal and the first terminal. Similarly, the wiring connected to the fourth terminal to which the power supply potential is supplied is generally designed to be thick, and an element other than the current mirror circuit is arranged between the fourth terminal and the second terminal. It is common not to. Therefore, a resistance component other than the current mirror circuit is reduced between the fourth terminal and the second terminal. As a result, according to this application example, the amplitude of the voltage signal supplied between the third terminal and the fourth terminal is reduced when performing inspection of the characteristics of the vibrator such as overdrive inspection and drive level inspection. can do.

[Application Example 3]
The above-described oscillation circuit may include a third switching unit that switches electrical connection between the first transistor and the fourth terminal.

  According to this application example, since the inspection signal input from the fourth terminal can be suppressed from flowing to the first transistor, the inspection signal input from the fourth terminal can be effectively applied to the vibrator. As a result, the amplitude of the voltage signal supplied between the third terminal and the fourth terminal can be reduced when performing inspection of the characteristics of the vibrator such as overdrive inspection and drive level inspection.

[Application Example 4]
The above-described oscillation circuit may include a fourth switching unit that is provided in parallel with the second transistor and switches an electrical connection between the second terminal and the fourth terminal.

  According to this application example, since the resistance between the second terminal and the fourth terminal can be further reduced, the third characteristic can be obtained when the characteristic inspection of the vibrator such as the overdrive inspection or the drive level inspection is performed. The amplitude of the voltage signal supplied between the terminal and the fourth terminal can be reduced.

[Application Example 5]
The oscillation circuit described above may include a third transistor cascode-connected to the first transistor and a fourth transistor cascode-connected to the second transistor.

  According to this application example, it is possible to suppress the parasitic capacitance of the second transistor of the current mirror circuit. The parasitic capacitance of the second transistor varies according to the power supply potential. Therefore, according to this application example, it is possible to suppress power supply fluctuations in the frequency of the signal output from the oscillation circuit.

[Application Example 6]
In the above-described oscillation circuit, the first switching unit may be a circuit having a function of protecting the oscillation unit against static electricity.

  According to this application example, since the first switching unit can be shared with a circuit having a function of protecting the oscillation unit against static electricity, a dedicated switch and a circuit for electrostatic protection are separately provided as the first switching unit. Compared to the case, the circuit scale can be reduced. Therefore, it is possible to realize an oscillation circuit that can be reduced in size.

[Application Example 7]
The above-described oscillation circuit further includes a control unit that controls the first switching unit and the second switching unit, wherein the first switching unit and the second switching unit include the first terminal and the third terminal. The first mode in which the first switching unit is controlled to be electrically connected and the second switching unit is controlled so that the second transistor is in an ON state, the first terminal, and the A second mode in which the first switching unit is controlled so as not to be electrically connected to the third terminal, and the second switching unit is controlled so that the second transistor is turned off. The control unit may switch from the second mode to the first mode based on a clock signal input during a period in which the supplied power supply potential is equal to or higher than a reference value.

  According to this application example, since the control unit switches the mode based on the magnitude of the power supply potential and the two signals of the clock signal, the mode is not switched only by changing the power supply potential. Therefore, it is possible to reduce the possibility of malfunctions in which modes are switched.

[Application Example 8]
The oscillator according to this application example is an oscillator including any one of the above-described oscillation circuits and a vibrator.

[Application Example 9]
An electronic device according to this application example is an electronic device including any of the above-described oscillation circuits.

[Application Example 10]
The moving body according to this application example is a moving body including any of the oscillation circuits described above.

  According to the electronic apparatus and the moving body according to these application examples, since the oscillation circuit or the oscillator with improved reliability of the vibrator inspection is included, a highly reliable electronic apparatus and the moving body can be realized.

[Application Example 11]
An oscillator manufacturing method according to this application example includes an oscillation unit having a first terminal and a second terminal connected to a vibrator, a third terminal, a fourth terminal to which a power supply potential is supplied, a first transistor, A current mirror circuit having a second transistor and outputting a current flowing from the fourth terminal to the second transistor to the second terminal based on a current flowing from the fourth terminal to the first transistor; An oscillation circuit including a first switching unit that switches an electrical connection between one terminal and the third terminal, and a second switching unit that switches a connection state of the second transistor; The first switching unit is switched so that the circuit and the vibrator are electrically connected, and the first terminal and the third terminal are electrically connected, and the second transistor is turned on. A preparation step of preparing a configuration in which the second switching unit is switched so as to become a signal applying step of applying a signal to the third terminal and the fourth terminal, and the first terminal and the third terminal. A switching step of switching the first switching unit so as not to be electrically connected and switching the second switching unit so that the second transistor is turned off.

  According to this application example, the voltage signal for inspecting the characteristics of the vibrator is supplied to the power supply conductive path, and the impedance control means provides a path between the path from the oscillation means to the vibrator and the power supply conductive path. By controlling so as to reduce the impedance of the vibrator, for example, inspection of the characteristics of the vibrator such as overdrive inspection and drive level inspection can be performed. In the normal operation of the oscillation circuit and the inspection of the vibrator, the power supply conductive path can be shared with the conductive path for supplying a voltage signal for inspecting the characteristics of the vibrator. Compared to the case, the number of terminals used for inspection can be reduced. Therefore, for example, it is possible to reduce the possibility of a test failure due to a poor electrical connection between the probe for inputting the test signal and the terminal on the oscillation circuit side. An oscillation circuit can be realized. In addition, since the voltage signal for inspecting the characteristics of the vibrator can be supplied to the vibrator via the power supply conductive path and the impedance control means without using the oscillation means, the voltage signal is supplied to the vibrator via the oscillation means. Compared with the case where the voltage signal is supplied, the restriction on the magnitude of the voltage signal is reduced. In addition, it is possible to realize an oscillation circuit that is less likely to deteriorate the oscillation unit even when the inspection signal of the vibrator is applied.

1 is a circuit diagram of an oscillation circuit 1 according to a first embodiment. FIG. 3 is a circuit diagram illustrating an example of a configuration of an oscillating unit 10. FIG. 4 is a timing chart for explaining a mode switching operation of a control unit 30. It is a circuit diagram of the oscillation circuit 1a which concerns on 2nd Embodiment. It is a circuit diagram of the oscillation circuit 1b which concerns on 3rd Embodiment. It is sectional drawing of the oscillator 1000 which concerns on this embodiment. It is sectional drawing of the oscillator 1000a which concerns on a modification. 5 is a flowchart showing a method for manufacturing the oscillator 1000 according to the present embodiment. It is a block diagram which shows the outline | summary of a signal application process. It is a functional block diagram of the electronic device 300 which concerns on this embodiment. 3 is a diagram illustrating an example of an appearance of a smartphone that is an example of an electronic apparatus 300. FIG. It is a figure (top view) which shows an example of the mobile body 400 which concerns on this embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The drawings used are for convenience of explanation. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

1. Oscillation Circuit According to First Embodiment FIG. 1 is a circuit diagram of an oscillation circuit 1 according to the first embodiment. A part or all of the oscillation circuit 1 may be constituted by a semiconductor device. Further, as an example of the present invention, the oscillation circuit 1 according to the first embodiment has a configuration in which the vibrator 100 is not included. However, the oscillation circuit 1 may have a configuration in which the vibrator 100 is included.

  The oscillation circuit 1 according to the present embodiment includes an oscillation unit that uses the vibrator 100 as a frequency source and has a conductive path for feedback with the vibrator 100, and a path through which a signal is input from the oscillation unit to the vibrator 100. Impedance control means for controlling impedance between the power supply conductive paths.

  More specifically, the oscillation circuit 1 includes an oscillation unit 10 having a first terminal 11 and a second terminal 12 connected to the vibrator 100, a third terminal 13, and a fourth terminal to which a power supply potential VDD is supplied. 14, a first transistor T1 and a second transistor T2, and based on the current flowing from the fourth terminal 14 to the first transistor T1, the current flowing from the fourth terminal 14 to the second transistor T2 is supplied to the second terminal 12. The output current mirror circuit 20, the first switching unit 21 that controls the electrical connection between the first terminal 11 and the third terminal 13, and the second state that controls the connection state (ON / OFF state) of the second transistor T2. 2 switching unit 22. The function of the oscillation means described above is mainly realized by the oscillation unit 10. The function of the signal applying means described above is mainly realized by the second terminal 12 and the fourth terminal 14. The impedance control means described above is realized mainly by the current mirror circuit 20, the first switching unit 21, and the second switching unit 22. In the example shown in FIG. 1, the oscillation circuit 1 includes a control unit 30 that controls the first switching unit 21 and the second switching unit 22, a fifth terminal 15 to which a control signal for frequency control is input, And a sixth terminal 16 for outputting an oscillation signal.

  The oscillation unit 10 is electrically connected to the vibrator 100 and performs an oscillation operation. As the oscillation unit 10, various known oscillation circuits such as a Pierce oscillation circuit, an inverter type oscillation circuit, a Colpitts oscillation circuit, and a Hartley oscillation circuit can be employed. In the present embodiment, the oscillation unit 10 is a Pierce oscillation circuit. Further, in the present embodiment, the frequency controller 42 and the output buffer 43 are included in association with the oscillation unit 10.

  FIG. 2 is a circuit diagram illustrating an example of the configuration of the oscillation unit 10. In the example shown in FIG. 2, the oscillation unit 10 includes a transistor M11, capacitors C13 to C15, and resistors R11 to R12. The capacitor C13 and the capacitor C14 are variable capacitors for frequency control.

The first terminal 11 is connected to the base of the transistor M11. The second terminal 12 is connected to the collector of the transistor M11. The base and collector of the transistor M11 are connected via a resistor R11. The collector of the transistor M11 is connected to the input terminal of the output buffer 43. The emitter of the transistor M11 is connected to the ground potential VSS. The capacitor C13 and the capacitor C15 are connected in series, one end (one terminal) of the capacitor C13 is connected to the first terminal 11, and one end (one terminal) of the capacitor C15 is connected to the ground potential VSS. . One end of the capacitor C14 is connected to the second terminal 12. The other end (the other terminal) of the capacitor C14 is connected to the common connection point of the capacitor C13 and the capacitor C15, and is connected to the output terminal of the frequency control unit 42 via the resistor R12.

  In the oscillation unit 10 shown in FIG. 2, the first terminal 11 is output on the input terminal side (the side to which the signal from the vibrator 100 is supplied), and the signal supplied to the vibrator 100 is output on the output terminal side. However, the input terminal side may be the second terminal 12, and the output terminal side may be the first terminal 11.

  Returning to FIG. 1, the frequency control unit 42 controls the variable capacitors (capacitor C <b> 13 and capacitor C <b> 14 in FIG. 2) included in the oscillation unit 10 based on the control signal input to the fifth terminal 15. That is, in the example shown in FIG. 1, the fifth terminal 15 also functions as a frequency control terminal. Thereby, the oscillation frequency in the oscillation unit 10 can be controlled. For example, the frequency control unit 42 may include an amplifier circuit that amplifies a control signal input to the fourth terminal 14 and outputs the amplified control signal to the oscillation unit 10.

  The output buffer 43 is composed of an amplifier circuit. The output buffer 43 receives an oscillation signal output from the oscillation unit 10 and outputs a signal to the sixth terminal 16.

  The current mirror circuit 20 includes a first transistor T1 and a second transistor T2. The current mirror circuit 20 outputs the current flowing from the fourth terminal 14 to the second transistor T2 to the second terminal 12 based on the current flowing from the fourth terminal 14 to the first transistor T1.

  In the example illustrated in FIG. 1, the current mirror circuit 20 includes a first transistor T1 that is a PMOS transistor and a second transistor T2 that is a PMOS transistor. The gate and drain of the first transistor T1 and the gate of the second transistor T2 are connected to each other, and the common connection point is connected to the ground potential VSS (third terminal 13) via the current source CS and via the transistor M2. Are connected to the ground potential VSS (third terminal 13). The source of the first transistor T1 is connected to the fourth terminal 14 via the transistor M3. The source of the second transistor T2 is connected to the fourth terminal 14. The drain of the second transistor T2 is connected to the second terminal 12. Note that the current mirror circuit 20 may be composed of a bipolar transistor.

The first switching unit 21 controls electrical connection between the first terminal 11 and the third terminal 13 of the oscillation unit 10. In the example shown in FIG. 1, the first switching unit 21 is connected from the first terminal 11 to the third terminal 13 via a wiring (grounding wiring in FIG. 1) based on a control signal output from the control unit 30. The electrical connection (impedance magnitude) between the first terminal 11 and the third terminal 13 is controlled so as to control the magnitude of the AC signal to be supplied. The first switching unit 21 includes, for example, a switch connected between the first terminal 11 and the third terminal 13 for controlling the magnitude of the impedance between the first terminal 11 and the third terminal 13. It may be comprised. In the example shown in FIG. 1, the NMOS transistor N1 functions as a switch. In the example shown in FIG. 1, the third terminal 13 connected to the first switching unit 21 is a terminal to which the ground potential VSS is supplied. However, as the third terminal 13, another function terminal (frequency control) is used. Or a dedicated terminal may be used.

  The second switching unit 22 controls the connection state (ON state or OFF state) of the second transistor T2. In the example illustrated in FIG. 1, the second switching unit 22 includes a transistor M2 that is an NMOS transistor. The drain of the transistor M2 is connected to the gate of the second transistor T2. The source of the transistor M2 is connected to the ground potential VSS (third terminal 13). The gate of the transistor M2 is connected to the output terminal of the control unit 30. The second switching unit 22 controls the connection state of the second transistor T2 to the ON state by connecting the gate potential of the second transistor T2 to the ground potential VSS based on the control signal output from the control unit 30. Can do.

  According to the oscillation circuit 1 according to the present embodiment, a voltage signal for inspecting the characteristics of the vibrator 100 is supplied to the power supply conductive path, and a path of the signal from the oscillation means to the vibrator 100 by the impedance control means By controlling so that the impedance between the power supply conductive path is reduced, for example, an overdrive test (a test in which an AC signal is applied to the vibrator 100 to strongly excite the vibrator 100) or a drive level test (AC Frequency stability inspection when the drive level of the signal is changed in the normal use range) and frequency adjustment of the vibrator 100 (resonance frequency of the vibrator 100 is measured so that the vibrator 100 has a desired resonance frequency). The characteristics of the vibrator 100 can be inspected. Since the power supply conductive path can be shared with the conductive path for supplying a voltage signal for inspecting the characteristics of the vibrator 100 during the normal operation of the oscillation circuit 1 and at the time of the inspection of the vibrator 100, Compared to the case where terminals are provided, the number of terminals used for inspection can be reduced. Therefore, for example, it is possible to reduce the possibility of a test failure due to a poor electrical connection between the probe for inputting the test signal and the terminal on the oscillation circuit 1 side. An enhanced oscillation circuit 1 can be realized. In addition, since the voltage signal for inspecting the characteristics of the vibrator 100 can be supplied to the vibrator 100 via the power supply conductive path and the impedance control means without going through the oscillation means, the vibrator 100 is passed through the oscillation means. Compared with the case where the voltage signal is supplied to the power supply, the restriction on the magnitude of the voltage signal is reduced. In addition, it is possible to realize the oscillation circuit 1 that is less likely to deteriorate the oscillation unit 10 even when the inspection signal of the vibrator 100 is applied.

  More specifically, according to the oscillation circuit 1 according to the present embodiment, for example, by supplying a voltage signal for inspecting the vibrator 100 between the third terminal 13 and the fourth terminal 14, For example, the inspection of the characteristics of the vibrator 100 such as an overdrive inspection and a drive level inspection can be performed. Since the fourth terminal 14 can be shared as a terminal to which the power supply potential VDD is supplied and a terminal to which a voltage signal for inspecting the vibrator 100 is supplied during the normal operation of the oscillation circuit 1 and the inspection of the vibrator 100, The number of terminals used for inspection can be reduced as compared with the case where inspection terminals dedicated for inspection are provided. Therefore, for example, it is possible to reduce the possibility of a test failure due to a poor electrical connection between the probe for inputting the test signal and the terminal on the oscillation circuit 1 side. An enhanced oscillation circuit 1 can be realized. Further, since the voltage signal for inspecting the characteristics of the vibrator 100 can be supplied to the vibrator 100 via the third terminal 13 and the fourth terminal 14 without going through the oscillator 10, Compared with the case where a voltage signal is supplied to the vibrator 100, the restriction on the magnitude of the voltage signal is reduced. In addition, since the inspection-dedicated terminal is shared with the terminal for normal operation, the number of terminals can be reduced, and the oscillation circuit 1 can be downsized.

  As shown in FIG. 1, the third terminal 13 may be a terminal to which the ground potential VSS is supplied.

In general, the wiring connected to the third terminal 13 to which the ground potential VSS is supplied is designed to be thick, and between the third terminal 13 and the first terminal 11 other than the first switching unit 21. Generally, no element is arranged. Therefore, a resistance component other than the first switching unit 21 is reduced between the third terminal 13 and the first terminal 11. Similarly, the wiring connected to the fourth terminal 14 to which the power supply potential VDD is supplied is generally designed to be thick, and a current mirror circuit 20 is provided between the fourth terminal 14 and the second terminal 12. It is common not to arrange other elements. Therefore, a resistance component other than the current mirror circuit 20 is reduced between the fourth terminal 14 and the second terminal 12. As a result, according to the present embodiment, the voltage signal supplied between the third terminal 13 and the fourth terminal 14 when performing inspection of the characteristics of the vibrator 100 such as overdrive inspection or drive level inspection. The amplitude can be reduced.

  As shown in FIG. 1, the first switching unit 21 may be a circuit (electrostatic discharge protection circuit) having a function of protecting the oscillation unit 10 against static electricity. In the example illustrated in FIG. 1, the first switching unit 21 includes an NMOS transistor N1 and a resistor R1, and serves as an electrostatic discharge protection circuit for the oscillation unit 10 and the first terminal 11 side of the transducer 100. Function.

  The drain of the NMOS transistor N1 is connected to the first terminal 11, and the source is connected to the ground potential VSS. One end (one terminal) of the resistor R1 is connected to the gate of the NMOS transistor N1, and the other end (the other terminal) is connected to the ground potential VSS. A control signal from the control unit 30 is input to the gate of the NMOS transistor N1, and the NMOS transistor N1 switches the connection state (ON state or OFF state) based on the input control signal.

  According to the oscillation circuit 1 according to the present embodiment, since the first switching unit 21 can be shared with a circuit having a function of protecting the oscillation unit 10 against static electricity, a dedicated switch as the first switching unit 21 and electrostatic protection Therefore, the circuit scale can be reduced as compared with the case where the circuit is provided separately. Therefore, the oscillation circuit 1 that can be reduced in size can be realized.

  As shown in FIGS. 1 and 2, the first terminal 11 may be electrically connected to the input terminal side of the oscillation unit 10. 1 and 2, the second terminal 12 may be electrically connected to the output terminal side of the oscillation unit 10.

  According to the oscillation circuit 1 according to the present embodiment, for example, a fixed potential such as the ground potential VSS can be supplied to the input terminal side of the oscillation unit 10 via the first terminal 11. It becomes easy to stop the operation of the oscillation unit 10. Therefore, for example, since the signal generated from the oscillation unit 10 during the inspection of the vibrator 100 is reduced to be applied to the vibrator 100, the oscillation circuit 1 with improved reliability of the inspection of the vibrator 100 can be realized. In addition, it is possible to realize the oscillation circuit 1 that is less likely to deteriorate the oscillation unit 10 even when the inspection signal of the vibrator 100 is applied.

  As illustrated in FIG. 1, the first switching unit 21 may be configured to include a transistor. In the example illustrated in FIG. 1, the first switching unit 21 includes an NMOS transistor N1.

  According to the oscillation circuit 1 according to the present embodiment, for example, by using the NMOS transistor N1 as a switch circuit, the electrical connection between the first terminal 11 and the third terminal 13 to which the ground potential VSS is supplied can be easily controlled. it can. In addition, the vibrator 100 can be inspected using two terminals of the third terminal 13 and the fourth terminal 14 to which the power supply potential VDD electrically connected to the second terminal 12 is supplied. Therefore, it is possible to reduce the possibility of a test failure due to poor electrical connection between the first terminal 11 and the third terminal 13, and to inspect the vibrator 100 with a small number of terminals. The oscillation circuit 1 with improved reliability of inspection can be realized.

  The oscillation circuit 1 may include a third switching unit 23 that switches the electrical connection between the first transistor T1 and the fourth terminal 14. In the example shown in FIG. 1, the third switching unit 23 includes a transistor M3 that is a PMOS transistor. The source of the transistor M3 is connected to the power supply potential VDD (fourth terminal 14). The drain of the transistor M3 is connected to the source of the first transistor T1. The gate of the transistor M3 is connected to the output terminal of the control unit 30. The third switching unit 23 can control the electrical connection between the first transistor T <b> 1 and the fourth terminal 14 based on the control signal output from the control unit 30.

  According to the present embodiment, since the inspection signal input from the fourth terminal 14 can be suppressed from flowing to the first transistor T1, the inspection signal input from the fourth terminal 14 can be effectively applied to the vibrator 100. Therefore, the amplitude of the voltage signal supplied between the third terminal 13 and the fourth terminal 14 is reduced when performing inspection of the characteristics of the vibrator 100 such as overdrive inspection or drive level inspection. be able to.

  As illustrated in FIG. 1, the oscillation circuit 1 further includes a control unit 30 that controls the first switching unit 21 and the second switching unit 22, and the first switching unit 21 and the second switching unit 22 include the first terminal. 1st mode in which the 1st switching part 21 is controlled so that 11 and the 3rd terminal 13 are electrically connected, and the 2nd switching part 22 is controlled so that the 2nd transistor T2 may be in an ON state The first switching unit 21 is controlled so that the first terminal 11 and the third terminal 13 are not electrically connected, and the second switching unit 22 is controlled so that the second transistor T2 is turned off. The second mode may be switched from the second mode to the first mode based on the clock signal SCLK input during a period in which the supplied power supply potential VDD is equal to or higher than the reference value Vt.

  In the example illustrated in FIG. 1, the control unit 30 includes a serial interface 31, a register 32, a memory 33, and a PMOS transistor P1.

  The serial interface 31 is supplied with the power supply potential VDD, receives the clock signal SCLK, and controls the register 32 and the memory 33 based on the input clock signal SCLK. In the present embodiment, the clock signal SCLK is input from the fifth terminal 15. In this embodiment, the serial interface 31 has a register write mode for writing data to the register 32 and a memory write mode for writing data to the register 32 and the memory 33. The serial interface 31 may have a memory read mode in which at least one data of the register 32 and the memory 33 is read and output to the fifth terminal 15.

  The register 32 stores data for controlling the first switching unit 21, the second switching unit 22, the frequency control unit 42, and the oscillation unit 10, and the first switching unit 21 and the second switching unit based on the stored data. The unit 22, the frequency control unit 42, and the oscillation unit 10 are controlled. When the oscillation circuit 1 is energized, the register 32 reads and stores the data stored in the memory 33. When new data is written by the serial interface 31, the new data written by the serial interface 31 is stored. Store.

The memory 33 stores data stored in the register 32 when the oscillation circuit 1 is energized. The memory 33 is, for example, an EEPROM (Electrically Erasable Programmable Read-Only Memory), a flash memory, an electrically rewritable FAMOS (Floating Gate Avalanche Injection Metal Oxide Semiconductor) memory that is erasable by irradiating ultraviolet rays, etc. You may comprise various well-known non-volatile memories, such as a non-volatile memory which can be rewritten and non-rewritable non-volatile memories, such as mask ROM (Read-Only Memory). The FAMOS memory is a system in which electric charges are accumulated in the floating gate by avalanche injection. This type of memory is a non-volatile memory used as a one time programmable (OTP) memory.

  The PMOS transistor P1 has a source connected to the power supply potential VDD, a drain connected to the gate of the NMOS transistor N1 of the first switching unit 21, and a control signal from the register 32 is input to the gate. The PMOS transistor P1 outputs a control signal to the gate of the NMOS transistor N1 of the first switching unit 21.

  In the first mode, the control unit 30 controls the first switching unit 21 so that the electrical connection state between the first terminal 11 and the third terminal 13 is turned on. In the first mode, the control unit 30 controls the second switching unit 22 so that the second transistor T2 is turned on. In the first mode, the control unit 30 controls the third switching unit 23 so that the transistor M3 is turned off. In the first mode, the control unit 30 controls the frequency control unit 42 to stop the operation of the frequency control unit 42.

  In the second mode, the control unit 30 controls the first switching unit 21 so that the electrical connection state between the first terminal 11 and the third terminal 13 is turned off. In the second mode, the control unit 30 controls the second switching unit 22 so that the connection state of the second transistor T2 is not controlled. Further, in the second mode, the control unit 30 controls the frequency control unit 42 so that the frequency control unit 42 operates normally.

  FIG. 3 is a timing chart for explaining the mode switching operation of the control unit 30. In FIG. 3, the horizontal axis corresponds to time, and the vertical axis corresponds to voltage. The upper timing chart in FIG. 3 shows the power supply potential VDD supplied to the control unit 30, and the lower timing chart in FIG. 3 shows the clock signal SCLK input to the control unit 30.

  In the example shown in FIG. 3, the power supply potential VDD becomes 0 V at time t0, becomes voltage VDDL at time t1, becomes reference value Vt at time t2, and then rises to voltage VDDH. The mode switching operation starts at time t3 which is the falling time of the pulse of the first clock signal SCLK input during the period when the power supply potential VDD is the voltage VDDH, and the first switching is performed based on the subsequent pulse of the clock signal SCLK. The control unit 30 controls the first switching unit 21 and the second switching unit 22 at a time t4 when the unit 21 and the second switching unit 22 are controlled to enter the first mode, for example, and the power supply potential VDD returns to the voltage VDDL. For example, the mode is switched to the second mode.

  According to the oscillation circuit 1 according to the present embodiment, the control unit 30 switches the mode based on the magnitude of the power supply potential VDD and the two signals of the clock signal SCLK. Therefore, it is possible to reduce the possibility of a malfunction in which the mode is switched unintentionally.

2. Oscillation Circuit According to Second Embodiment FIG. 4 is a circuit diagram of an oscillation circuit 1a according to the second embodiment. The same components as those of the oscillation circuit 1 shown in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted.

  The oscillation circuit 1a according to the present embodiment includes a fourth switching unit 24 that is provided in parallel with the second transistor T2 and switches the electrical connection between the second terminal 12 and the fourth terminal 14.

The fourth switching unit 24 controls electrical connection between the second terminal 12 and the fourth terminal 14 of the oscillation unit 10. In the example shown in FIG. 1, the fourth switching unit 24 is connected to the fourth terminal 14 from the second terminal 12 via the wiring (power supply conductive path in FIG. 1) based on the control signal output from the control unit 30. The electrical connection state (impedance magnitude) between the second terminal 12 and the fourth terminal 14 is controlled so as to control the magnitude of the AC signal to be output. The 4th switching part 24 contains the switch connected between the 2nd terminal 12 and the 4th terminal 14 as what controls the magnitude | size of the impedance between the 2nd terminal 12 and the 4th terminal 14, for example. It may be comprised. In the example shown in FIG. 1, the PMOS transistor P2 functions as a switch.

  As shown in FIG. 1, the fourth switching unit 24 may be a circuit (electrostatic discharge protection circuit) having a function of protecting the oscillation unit 10 against static electricity. In the example shown in FIG. 1, the fourth switching unit 24 includes a PMOS transistor P2 and a resistor R2, and serves as an electrostatic discharge protection circuit for the oscillation unit 10 and the second terminal 12 side of the transducer 100. Function.

  The drain of the PMOS transistor P2 is connected to the second terminal 12, and the source is connected to the power supply potential VDD (fourth terminal 14). One end (one terminal) of the resistor R2 is connected to the gate of the PMOS transistor P2, and the other end (the other terminal) is connected to the power supply potential VDD (fourth terminal 14). A control signal from the control unit 30 is input to the gate of the PMOS transistor P2, and the PMOS transistor P2 switches the connection state (ON state or OFF state) based on the input control signal.

  According to the oscillation circuit 1a according to the present embodiment, since the fourth switching unit 24 can be shared with a circuit having a function of protecting the oscillation unit 10 against static electricity, a dedicated switch as the fourth switching unit 24 and electrostatic protection Therefore, the circuit scale can be reduced as compared with the case where the circuit is provided separately. Therefore, the oscillation circuit 1a that can be reduced in size can be realized.

  As shown in FIG. 1, the fourth switching unit 24 may include a transistor. In the example illustrated in FIG. 1, the fourth switching unit 24 includes a PMOS transistor P2.

  According to the oscillation circuit 1 according to the present embodiment, for example, by using the PMOS transistor P1 as a switch circuit, the electrical connection between the second terminal 12 and the fourth terminal 14 to which the power supply potential VDD is supplied can be easily controlled. it can. In addition, the vibrator 100 can be inspected using the third terminal 13 and the fourth terminal 14 to which the ground potential VSS electrically connected to the first terminal 11 is supplied. Therefore, it is possible to reduce the possibility of a test failure due to poor electrical connection between the second terminal 12 and the fourth terminal 14 and to inspect the vibrator 100 with a small number of terminals. The oscillation circuit 1a with improved reliability of the inspection can be realized.

  The control unit 30a includes an NMOS transistor N2. The NMOS transistor N2 has a source connected to the ground potential VSS (third terminal 13), a drain connected to the gate of the PMOS transistor P2 of the fourth switching unit 24, and a control signal from the register 32 input to the gate. . The NMOS transistor N2 outputs a control signal to the gate of the PMOS transistor P2 of the fourth switching unit 24. The control signal input to the NMOS transistor N2 is a signal having a phase opposite to that of the control signal input to the PMOS transistor P1. That is, when the second transistor T2 is controlled to be in the ON state, the fourth switching unit 24 is controlled to be in the ON state.

  According to the present embodiment, since the resistance between the second terminal 12 and the fourth terminal 14 can be further reduced, when performing characteristics inspection of the vibrator 100 such as overdrive inspection or drive level inspection. The amplitude of the voltage signal supplied between the third terminal 13 and the fourth terminal 14 can be reduced.

  Also in the present embodiment, the same effect is obtained for the same reason as in the first embodiment.

3. Oscillation Circuit According to Third Embodiment FIG. 5 is a circuit diagram of an oscillation circuit 1b according to the third embodiment. The same components as those of the oscillation circuit 1 shown in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted.

  The oscillation circuit 1b according to the present embodiment includes a third transistor T3 that is cascode-connected to the first transistor T1, and a fourth transistor T4 that is cascode-connected to the second transistor T2. In the example shown in FIG. 5, the third transistor T3 and the fourth transistor T4 are PMOS transistors. Note that the third transistor T3 and the fourth transistor T4 may be formed of bipolar transistors.

  In the example shown in FIG. 5, the gate and drain of the third transistor T3 and the gate of the fourth transistor T4 are connected to each other, and the common connection point is connected to the ground potential VSS (third terminal 13) via the transistor M5. Yes. The source of the third transistor T3 is connected to the drain of the transistor M3. The drain of the third transistor T3 is connected to the source of the first transistor T1. The source of the fourth transistor T4 is connected to the power supply potential VDD (fourth terminal 14). The drain of the fourth transistor T4 is connected to the source of the second transistor T2.

  The oscillation circuit 1b includes a fifth switching unit 25 that switches the connection state (ON state or OFF state) of the fourth transistor T4. In the example shown in FIG. 5, the fifth switching unit 25 includes a transistor M5 that is an NMOS transistor. The drain of the transistor M5 is connected to the gate of the fourth transistor T4. The source of the transistor M5 is connected to the ground potential VSS (third terminal 13). The gate of the transistor M5 is connected to the output terminal of the control unit 30. The fifth switching unit 25 controls the connection state of the fourth transistor T4 to the ON state by connecting the gate potential of the fourth transistor T4 to the ground potential VSS based on the control signal output from the control unit 30. Can do.

  According to the present embodiment, the parasitic capacitance of the second transistor T2 of the current mirror circuit 20 can be suppressed. The parasitic capacitance of the second transistor T2 varies according to the power supply potential VDD. Therefore, according to the present embodiment, it is possible to suppress power supply fluctuations in the frequency of the signal output from the oscillation circuit 1b.

  Also in the present embodiment, the same effect is obtained for the same reason as in the first embodiment.

  In the present embodiment, the fourth switching unit 24 may be included as in the second embodiment. In this case, the same effect is obtained for the same reason as in the second embodiment.

3. Oscillator FIG. 6 is a cross-sectional view of an oscillator 1000 according to this embodiment. The oscillator 1000 includes the electronic component 2 that constitutes the oscillation circuit 1 and the vibrator 100. In the example illustrated in FIG. 6, the oscillator 1000 includes a package 1100 that accommodates the electronic component 2 and the vibrator 100 in the same space. Further, in the example shown in FIG.
000 includes a lid 1200 and an electrode 1300. In the example shown in FIG. 6, the electronic component 2 is configured as a one-chip semiconductor device. Further, as the vibrator 100, a piezoelectric vibrator such as a crystal vibrator or a SAW resonator, a MEMS vibrator, or the like may be employed.

  The package 1100 is provided with a recess, and the housing 1200 is formed by covering the recess with a lid 1200. In the package 1100, wirings and terminals for electrically connecting the oscillation circuit 1 and the vibrator 100 are provided on the surface of the recess or inside the package 1100. The package 1100 is electrically connected to the third terminal 13 (VSS), the fourth terminal 14 (VC), the fifth terminal 15 (VDD), and the sixth terminal 16 (OUT) of the oscillation circuit 1. An electrode 1300 is provided.

  FIG. 7 is a cross-sectional view of an oscillator 1000a according to a modification. The oscillator 1000 a includes the electronic component 2 that constitutes the oscillation circuit 1 and the vibrator 100. In the example shown in FIG. 7, the oscillator 1000a includes a package 1100a that houses the electronic component 2 and the vibrator 100 in different spaces. In the example illustrated in FIG. 7, the oscillator 1000 includes a lid 1200, an electrode 1300, and a sealing member 1500. In the example shown in FIG. 7, the electronic component 2 is configured as a one-chip semiconductor device. Further, as the vibrator 100, a piezoelectric vibrator such as a crystal vibrator or a SAW resonator, a MEMS vibrator, or the like may be employed.

  The package 1100a is provided with two recesses on the opposing surfaces. The cover 1200 covers one recess and the accommodation chamber 1400a and the sealing member 1500 covers the other recess to become the accommodation chamber 1400b. In the example shown in FIG. 7, the vibrator 100 is housed in the housing chamber 1400a, and the electronic component 2 is housed in the housing chamber 1400b. In the package 1100a, wirings and terminals for electrically connecting the oscillation circuit 1 and the vibrator 100 are provided on the surface of the recess or inside the package 1100a. Further, the third terminal 13 (VSS), the fourth terminal 14 (VC), the fifth terminal 15 (VDD), and the sixth terminal 16 (OUT) of the oscillation circuit 1 are electrically connected to the package 1100a. An electrode 1300 is provided.

  According to the oscillator 1000 and the oscillator 1000a according to the present embodiment, the oscillator 1000 and the oscillator 1000a with improved reliability of the inspection of the vibrator 100 are included because the oscillator circuit 1 with improved reliability of the inspection of the vibrator 100 is included. Can be realized. Even when the oscillation circuit 1a or the oscillation circuit 1b is employed in place of the oscillation circuit 1, the same effect can be obtained for the same reason.

4). Oscillator Manufacturing Method FIG. 8 is a flowchart showing a method of manufacturing the oscillator 1000 according to the present embodiment.

In the method for manufacturing the oscillator 1000 according to the present embodiment, the oscillator 10 having the first terminal 11 and the second terminal 12 connected to the vibrator 100, the third terminal 13, and the fourth power supply potential VDD is supplied. The terminal 14 has a first transistor T1 and a second transistor T2. Based on the current flowing from the fourth terminal 14 to the first transistor T1, the current flowing from the fourth terminal 14 to the second transistor T2 is second terminal 12. To control the electrical connection between the first terminal 11 and the third terminal 13, and the connection state (ON / OFF state) of the second transistor T2. The oscillation circuit 1 including the second switching unit 22 and the vibrator 100 are electrically connected. The oscillation circuit 1 and the vibrator 100 are electrically connected, and the first switching unit 21 is connected to the first terminal 11 and the third switching unit 21. In addition to switching so as to be electrically connected to the child 13, a preparation process for preparing a configuration in which the second transistor T2 is switched on is applied, and a signal is applied to the third terminal 13 and the fourth terminal 14. A signal applying step and a switching step of switching the first switching unit 21 so that the first terminal 11 and the third terminal 13 are not electrically connected.

  First, the first switching unit 21 is controlled so that the oscillation circuit 1 and the vibrator 100 are electrically connected, and the first terminal 11 and the third terminal 13 are electrically connected, and the second A configuration is prepared in which the second switching unit 22 is controlled so that the transistor T2 is turned on (preparation step; step S100). More specifically, a configuration in which the vibrator 100 is electrically connected between the first terminal 11 and the second terminal 12 of the oscillation circuit 1 is prepared. For example, the oscillation circuit 1 may be set to the first mode by the control unit 30 after the oscillation circuit 1 and the vibrator 100 are connected, or the oscillation circuit 1 that has been previously set to the first mode by the control unit 30. The vibrator 100 may be connected.

  After step S100, a signal is applied to the third terminal 13 and the fourth terminal 14 (signal applying step; step S102).

  FIG. 9 is a block diagram showing an outline of the signal applying process. In the example shown in FIG. 9, the signal generator 3000 is used to perform overdrive inspection of the vibrator 100. Instead of the signal generator 3000, an overdrive test of the vibrator 100 may be performed using an external oscillation circuit that can resonate with the vibrator 100, for example, a Colpitts oscillation circuit. Further, a drive level inspection may be performed instead of the overdrive inspection, or two inspections of an overdrive inspection and a drive level inspection may be performed.

  The electrode 1300 (VDD) of the oscillator 1000 that is electrically connected to the fourth terminal 14 (VDD) of the oscillation circuit 1 is connected to the output terminal of the signal generator 3000. The electrode 1300 (VSS) of the oscillator 1000 that is electrically connected to the third terminal 13 (VSS) of the oscillation circuit 1 is connected to the ground potential VSS. The electrode 1300 (VC) of the oscillator 1000 electrically connected to the fifth terminal 15 (VC) of the oscillation circuit 1 and the electrode of the oscillator 1000 electrically connected to the sixth terminal 16 (OUT) of the oscillation circuit 1 1300 (OUT) is not connected anywhere.

  The voltage signal output from the signal generator 3000 is equal to or higher than the lowest voltage (for example, the lowest operating voltage of the transistor) that can control the first switching unit 21 and the second switching unit 22, and the highest voltage that does not destroy the oscillation circuit 1 (for example, The voltage within a range equal to or lower than the breakdown voltage of the transistor is a voltage signal applied between the third terminal 13 and the fourth terminal 14.

  With the configuration shown in FIG. 9, a voltage signal can be applied between the third terminal 13 and the fourth terminal 14. Accordingly, the characteristics of the vibrator 100 such as overdrive inspection and drive level inspection can be inspected.

  After step S102, the first switching unit 21 is controlled so that the first terminal 11 and the third terminal 13 are not electrically connected (switching step; step S104). Further, the second switching unit 22 is controlled so that the connection state of the second transistor T2 is not controlled. Specifically, for example, the control unit 30 controls the first switching unit 21 and the second switching unit 22 to switch to the second mode. As a result, the oscillator 1000 is in a state where it can normally operate.

According to the method for manufacturing the oscillator 1000 according to the present embodiment, by supplying a voltage signal for inspecting the vibrator 100 between the third terminal 13 and the fourth terminal 14 in the signal applying step (step S102). For example, inspection of the characteristics of the vibrator 100 such as overdrive inspection and drive level inspection can be performed. Since the fourth terminal 14 can be shared as a terminal to which the power supply potential VDD is supplied and a terminal to which a voltage signal for inspecting the vibrator 100 is supplied during the normal operation of the oscillation circuit 1 and the inspection of the vibrator 100, The number of terminals used for inspection can be reduced as compared with the case where inspection terminals dedicated for inspection are provided. Therefore, for example, it is possible to reduce the possibility of a test failure due to a poor electrical connection between the probe for inputting the test signal and the terminal on the oscillation circuit 1 side. An improved manufacturing method of the oscillator 1000 can be realized.

  In the method for manufacturing the oscillator 1000 described above, the signal applied to the third terminal 13 and the fourth terminal 14 in the signal applying step (step S102) is at least one of an overdrive inspection signal and a drive level inspection signal. There may be one.

  By performing at least one of the overdrive inspection and the drive level inspection as the inspection of the vibrator 100, the oscillator 1000 that has become a non-defective product by the inspection of the vibrator 100 can be determined as a non-defective product. A high oscillator 1000 can be manufactured.

  Note that, when the oscillation circuit 1a or the oscillation circuit 1b is employed instead of the oscillation circuit 1, the same effect is obtained for the same reason. Further, the oscillator 1000a can be manufactured in the same manner as the oscillator 1000, and has the same effect.

5. Electronic Device FIG. 10 is a functional block diagram of an electronic device 300 according to this embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to each embodiment mentioned above, and detailed description is abbreviate | omitted.

  The electronic device 300 according to the present embodiment is an electronic device 300 including the oscillation circuit 1, the oscillation circuit 1a, or the oscillation circuit 1b. In the example illustrated in FIG. 10, the electronic device 300 includes a vibrator 100, an oscillation circuit 1, a multiplication circuit 310, a CPU (Central Processing Unit) 320, an operation unit 330, a ROM (Read Only Memory) 340, and a RAM (Random Access Memory). ) 350, a communication unit 360, a display unit 370, and a sound output unit 380. Note that the electronic device 300 according to the present embodiment may omit or change some of the components (each unit) illustrated in FIG. 9 or may have a configuration in which other components are added.

  The multiplier circuit 310 supplies a clock pulse not only to the CPU 320 but also to each unit (not shown). The clock pulse may be, for example, a signal obtained by extracting a desired harmonic signal from the oscillation signal from the oscillation circuit 1 connected to the vibrator 100 by the multiplication circuit 310, or the oscillation signal from the oscillation circuit 1 may be converted into a PLL. It may be a signal multiplied by a multiplier circuit 310 having a synthesizer (not shown).

  The CPU 320 performs various types of calculation processing and control processing using the clock pulse output from the multiplication circuit 310 in accordance with a program stored in the ROM 340 or the like. Specifically, the CPU 320 performs various processes according to operation signals from the operation unit 330, processes for controlling the communication unit 360 to perform data communication with the outside, and displays various types of information on the display unit 370. Processing for transmitting a display signal, processing for causing the sound output unit 380 to output various sounds, and the like are performed.

  The operation unit 330 is an input device including operation keys, button switches, and the like, and outputs an operation signal corresponding to an operation by the user to the CPU 320.

  The ROM 340 stores programs, data, and the like for the CPU 320 to perform various calculation processes and control processes.

The RAM 350 is used as a work area of the CPU 320, and temporarily stores programs and data read from the ROM 340, data input from the operation unit 330, calculation results executed by the CPU 320 according to various programs, and the like.

  The communication unit 360 performs various controls for establishing data communication between the CPU 320 and an external device.

  The display unit 370 is a display device configured by an LCD (Liquid Crystal Display), an electrophoretic display, or the like, and displays various types of information based on a display signal input from the CPU 320.

  The sound output unit 380 is a device that outputs sound such as a speaker.

  The electronic device 300 according to the present embodiment includes the oscillation circuit 1, the oscillation circuit 1 a, or the oscillation circuit 1 b with improved reliability of the inspection of the vibrator 100, so that the highly reliable electronic device 300 can be realized. .

  Various electronic devices can be considered as the electronic device 300. For example, personal computers (for example, mobile personal computers, laptop personal computers, tablet personal computers), mobile terminals such as mobile phones, digital still cameras, inkjet discharge devices (for example, inkjet printers), routers and switches Storage area network equipment, local area network equipment, mobile terminal base station equipment, TV, video camera, video recorder, car navigation device, pager, electronic notebook (including communication functions), electronic dictionary, calculator, electronic Game equipment, game controllers, word processors, workstations, videophones, security TV monitors, electronic binoculars, POS (point of sale) terminals, medical equipment Instruments (for example, electronic thermometers, blood pressure monitors, blood glucose meters, electrocardiogram measuring devices, ultrasonic diagnostic devices, electronic endoscopes), fish detectors, various measuring instruments, measuring instruments (for example, vehicles, aircraft, ship instruments), Flight simulators, head mounted displays, motion traces, motion tracking, motion controllers, PDR (pedestrian position and orientation measurement), and the like.

  FIG. 11 is a diagram illustrating an example of the appearance of a smartphone that is an example of the electronic apparatus 300. A smartphone that is the electronic device 300 includes a button as the operation unit 330 and an LCD as the display unit 370. And since the smart phone which is the electronic device 300 contains the oscillation circuit 1, the oscillation circuit 1a, or the oscillation circuit 1b, the electronic device 300 which improved the reliability of the test | inspection of the vibrator | oscillator 100 is realizable.

6). FIG. 12 is a diagram (top view) illustrating an example of the moving object 400 according to the present embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to each embodiment mentioned above, and detailed description is abbreviate | omitted.

  The moving body 400 according to the present embodiment is a moving body 400 including the oscillation circuit 1, the oscillation circuit 1a, or the oscillation circuit 1b. FIG. 12 shows a moving body 400 including an oscillator 1000 including the oscillation circuit 1. In the example shown in FIG. 12, the moving body 400 includes a controller 420, a controller 430, a controller 440, a battery 450, and a backup battery 460 that perform various controls such as an engine system, a brake system, and a keyless entry system. It is configured. In addition, the mobile body 400 according to the present embodiment may omit or change some of the components (respective parts) shown in FIG. 12, or may have a configuration in which other components are added.

Since the moving body 400 according to the present embodiment includes the oscillation circuit 1, the oscillation circuit 1 a, or the oscillation circuit 1 b with improved reliability of the inspection of the vibrator 100, the highly reliable moving body 400 can be realized. .

  As such a moving body 400, various moving bodies can be considered, and examples thereof include automobiles (including electric automobiles), aircraft such as jets and helicopters, ships, rockets, and artificial satellites.

  As mentioned above, although this embodiment or the modification was demonstrated, this invention is not limited to these this embodiment or a modification, It is possible to implement in a various aspect in the range which does not deviate from the summary.

  The present invention includes substantially the same configuration (for example, a configuration having the same function, method, and result, or a configuration having the same object and effect) as the configuration described in the embodiment. In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. In addition, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

DESCRIPTION OF SYMBOLS 1, 1a, 1b ... Oscillator circuit, 2 ... Electronic component, 10 ... Oscillator part, 11 ... 1st terminal, 12 ... 2nd terminal, 13 ... 3rd terminal, 14 ... 4th terminal, 15 ... 5th terminal, 16 ... 6th terminal, 20 ... Current mirror circuit, 21 ... 1st switching part, 22 ... 2nd switching part, 23 ... 3rd switching part, 24 ... 4th switching part, 25 ... 5th switching part, 30 ... Control part 31 ... Serial interface, 32 ... Register, 33 ... Memory, 42 ... Frequency control unit, 43 ... Output buffer, 100 ... Vibrator, 300 ... Electronic device, 310 ... Multiplier circuit, 320 ... CPU, 330 ... Operation unit, 340 ... ROM, 350 ... RAM, 360 ... communication unit, 370 ... display unit, 380 ... voice output unit, 400 ... moving body, 420 ... controller, 430 ... controller, 440 ... controller, 450 ... battery, 4 0 ... Backup battery, 1000, 1000a ... Oscillator, 1100, 1100a ... Package, 1200 ... Lid, 1300 ... Electrode, 1400, 1400a, 1400b ... Storage chamber, 1500 ... Sealing member, 3000 ... Signal generator, C13 to C15 ... Capacitor, CS11 ... Current source, M2, M3, M5, M11 ... Transistor, N1-N3 ... NMOS transistor, P1-P3 ... PMOS transistor, R1, R11, R12 ... Resistor, T1 ... First transistor, T2 ... Second transistor , T3 ... third transistor, T4 ... fourth transistor, VDD ... power supply potential, VSS ... ground potential

Claims (11)

An oscillator having a first terminal and a second terminal connected to the vibrator;
A third terminal;
A fourth terminal to which a power supply potential is supplied;
A current mirror circuit having a first transistor and a second transistor and outputting a current flowing from the fourth terminal to the second transistor to the second terminal based on a current flowing from the fourth terminal to the first transistor When,
A first switching unit that switches electrical connection between the first terminal and the third terminal;
A second switching unit for switching a connection state of the second transistor;
Including an oscillation circuit. The oscillation circuit according to claim 1,
The oscillation circuit, wherein the third terminal is a terminal to which a ground potential is supplied. The oscillation circuit according to claim 1 or 2,
An oscillation circuit including a third switching unit that switches electrical connection between the first transistor and the fourth terminal. The oscillation circuit according to any one of claims 1 to 3,
An oscillation circuit including a fourth switching unit that is provided in parallel with the second transistor and switches an electrical connection between the second terminal and the fourth terminal. The oscillation circuit according to any one of claims 1 to 4,
A third transistor in cascode connection with the first transistor;
A fourth transistor in cascode connection with the second transistor;
Including an oscillation circuit. The oscillation circuit according to any one of claims 1 to 5,
The first switching unit is an oscillation circuit that is a circuit having a function of protecting the oscillation unit against static electricity. The oscillation circuit according to any one of claims 1 to 6,
A control unit for controlling the first switching unit and the second switching unit;
The first switching unit and the second switching unit are:
The first switching unit is controlled so that the first terminal and the third terminal are electrically connected, and the second switching unit is controlled so that the second transistor is turned on. The first mode;
A second mode in which the first switching unit is controlled so that the first terminal and the third terminal are not electrically connected;
Have
The controller is
An oscillation circuit that switches from the second mode to the first mode based on a clock signal that is input during a period in which the supplied power supply potential is equal to or higher than a reference value. The oscillation circuit according to any one of claims 1 to 7,
A vibrator,
Including an oscillator   An electronic device comprising the oscillation circuit according to claim 1.   A moving body comprising the oscillation circuit according to claim 1. An oscillation unit having a first terminal and a second terminal connected to the vibrator, a third terminal, a fourth terminal to which a power supply potential is supplied, a first transistor and a second transistor, and the fourth terminal A current mirror circuit that outputs a current flowing from the fourth terminal to the second transistor to the second terminal based on a current flowing from the first transistor to the first transistor; and an electrical connection between the first terminal and the third terminal An oscillation circuit including a first switching unit that switches a connection and a second switching unit that switches a connection state of the second transistor, and a vibrator.
The first switching unit is switched so that the oscillation circuit and the vibrator are electrically connected, and the first terminal and the third terminal are electrically connected, and the second transistor is in an ON state. A preparation step of preparing a configuration in which the second switching unit is switched so that
Applying a signal to the third terminal and the fourth terminal;
A switching step of switching the first switching unit so that the first terminal and the third terminal are not electrically connected;
A method for manufacturing an oscillator, comprising:

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