JPH05218740A - Oscillation circuit provided with crystal vibrator - Google Patents

Oscillation circuit provided with crystal vibrator

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Publication number
JPH05218740A
JPH05218740A JP1793292A JP1793292A JPH05218740A JP H05218740 A JPH05218740 A JP H05218740A JP 1793292 A JP1793292 A JP 1793292A JP 1793292 A JP1793292 A JP 1793292A JP H05218740 A JPH05218740 A JP H05218740A
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JP
Japan
Prior art keywords
voltage
oscillation
circuit
value
drive voltage
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP1793292A
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Japanese (ja)
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JP2608221B2 (en
Inventor
Hitoaki Hayashi
Mikio Ozawa
美喜男 小沢
仁顕 林
Original Assignee
Asahi Denpa Kk
朝日電波株式会社
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Application filed by Asahi Denpa Kk, 朝日電波株式会社 filed Critical Asahi Denpa Kk
Priority to JP4017932A priority Critical patent/JP2608221B2/en
Publication of JPH05218740A publication Critical patent/JPH05218740A/en
Application granted granted Critical
Publication of JP2608221B2 publication Critical patent/JP2608221B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

(57) [Abstract] [Purpose] To provide an oscillation circuit having a crystal unit with low power consumption, high short-term and long-term stability, and excellent temperature characteristics. [Structure] After the starting voltage E1 applied to the crystal unit is set higher than the oscillation start voltage E S to start oscillation,
The steady drive voltage E2 is set to a value in the vicinity of the oscillation start voltage E S , that is, a value within 1.5 times the value in the vicinity of the oscillation stop voltage E E.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifier and an oscillator circuit in which a crystal oscillator is connected to a feedback circuit connected between the input and output of the amplifier.

[0002]

2. Description of the Related Art Oscillation circuits having crystal oscillators are used in many electronic devices because they have high stability against changes in the oscillation frequency with temperature. Conventionally, in an oscillation circuit having a crystal oscillator, a drive voltage applied to the crystal oscillator in order to reliably vibrate the crystal oscillator is a voltage sufficiently higher than an oscillation start voltage. That is, conventionally, in an oscillation circuit having a crystal resonator, it is considered that stable oscillation cannot be performed due to the influence of temperature fluctuation, aging, etc., if a driving voltage slightly higher than the oscillation start voltage is applied. Therefore, the drive voltage was set to a voltage value sufficiently higher than the oscillation start voltage. For example, allow 20% for each semiconductor element in the oscillator circuit and operating environment.
For this reason, it is necessary to apply a drive voltage that is at least 1.4 times the oscillation start voltage, but considering the stability of the overall circuit, it was set to a higher value, generally higher than 1.5 times the oscillation start voltage. .. For example, when the oscillation starting voltage is about 1.5 V, it was usual to apply a driving voltage of 3 V or more.

[0003]

As described above, in the oscillation circuit having the conventional crystal oscillator which is driven at a voltage considerably higher than the oscillation start voltage, the power consumption is inevitably increased and a large power source is required. There is a drawback to For example,
When such an oscillator circuit is used in a portable device, there is a drawback that the battery will be greatly consumed. In particular, portable devices tend to be smaller and lighter in weight, which limits the use of large-capacity batteries, and thus increases power consumption is a fatal drawback. Furthermore, if the drive voltage is considerably higher than the oscillation start voltage, the crystal unit will be overdriven, the temperature of the crystal unit will continue to rise after startup, and the oscillation frequency will gradually increase for a long time after the power is turned on. Or there is a drawback that it gradually decreases. That is, the oscillation circuit having the conventional crystal oscillator has a drawback that the short-term stability of the frequency after the power is turned on is poor. For example, in a wireless device having an oscillation circuit using a crystal oscillator, the frequency shifts for several hours even after the power is turned on, so it is necessary to frequently adjust the frequency in use.

Further, when the driving voltage is high, the movement and displacement of the lattice of the quartz crystal forming the quartz oscillator will occur violently, and the long-term stability will not be good. Further, when there is a discontinuity in the frequency characteristic or crystal impedance of the crystal unit, the influence thereof becomes very large when the driving voltage is high, and the frequency deviation becomes large.

Therefore, an object of the present invention is to solve these conventional drawbacks, to reduce power consumption, to have excellent short-term stability and long-term stability, and to significantly affect the discontinuity of frequency characteristics and crystal impedance. It is intended to provide an oscillation circuit configured to perform stable oscillation operation without being affected by the above.

[0006]

According to the present invention, in an oscillation circuit in which a crystal oscillator is connected to an amplifier and a feedback circuit connected between the input and output of the amplifier, a steady drive voltage applied to the oscillation circuit is It is set to a value between the voltage near the oscillation start voltage, which is the voltage at which the oscillator starts oscillation, and the oscillation stop voltage, which is the voltage at which oscillation stops when the drive voltage is reduced. It is what

[0007]

FIG. 1 shows a circuit configuration for measuring the basic operating characteristics of an oscillation circuit having a crystal oscillator, and FIG. 2 is a graph showing the operating characteristics measured by the circuit configuration. The oscillator circuit is an amplifier 1 composed of a C-MOS inverter.
And a feedback circuit connected between its input and output. The feedback circuit is provided with a crystal resonator 2, a resistor 3, and capacitors 4 and 5. The power supply voltage for the oscillating circuit is given to the amplifier 1, and the voltage E and the current I thereof are measured by the voltmeter 6 and the ammeter 7, respectively. In FIG. 2, the horizontal axis shows the value E of the power supply voltage measured by the voltmeter 6, and the vertical axis shows the value of the power supply current I measured by the ammeter 7. When the power supply voltage is gradually increased, a current starts to flow from about 1.4 V, and when it reaches about 1.5 V, the current suddenly increases and oscillation is started. The voltage value at this time is the oscillation start voltage E S
(1.523 volts). It can be seen that when the voltage is further increased, the current increases almost in proportion to it, and the oscillation continues. Next, when the voltage E is gradually decreased, the current I decreases almost in proportion to it, but the oscillation continues even if the drive voltage becomes lower than the oscillation start voltage E S , and the voltage is about 1.1 V. Oscillation stops only when it is lowered to. The voltage at this time is the oscillation stop voltage E E (1.099 V). It was found that after the crystal oscillator 2 was once started in this way, the oscillation continued even if the drive voltage was made lower than the oscillation start voltage E S. in this case,
The change in the oscillation frequency due to the change in the drive voltage E was extremely small and was within several ppm.

The present invention has been made based on the above consideration, and the steady drive voltage of the oscillation circuit having the crystal oscillator is changed from the value near the oscillation start voltage E S to the oscillation stop voltage E E.
It was set up to. It was confirmed that even if the steady drive voltage is set to a value within such a range, an oscillation circuit superior to the conventional one in terms of the influence of the temperature characteristics and the crystal characteristics of the crystal unit can be obtained. Also, the upper limit of the steady drive voltage is near the oscillation start voltage, but it was confirmed that it is preferable to set it to 1.5 times the oscillation start voltage (2.28 V in FIG. 2) or less as described later. As described above, since the steady driving voltage for steadily driving the crystal unit is set to a value between the value near the oscillation start voltage E S and the oscillation stop voltage E E , the power consumption after start-up is reduced to the conventional one. It can be made significantly smaller than that. In addition, by setting the steady drive voltage low, the temperature rise of the crystal unit after startup is suppressed within a short period of time, improving short-term stability, and the frequency after power-on is within a short period of time. It will be stable. Furthermore, since the steady driving voltage is low, the displacement of the crystal lattice of the crystal unit is small, and the long-term stability is also improved. Further, even when there is a discontinuous change in the frequency characteristic or crystal impedance of the crystal unit, the driving voltage is low, so the effect is extremely small.

In the oscillator circuit of the present invention, when the steady drive voltage is set to a voltage lower than the oscillation start voltage E S, a voltage higher than the oscillation start voltage is applied when the power is turned on to start oscillation. After that, a power supply circuit that automatically reduces the drive voltage to a voltage lower than the oscillation start voltage is required. However, when the steady drive voltage is set to a value higher than the oscillation start voltage E S , the oscillation operation is performed in this way. No power supply circuit that changes the drive voltage according to the above is required.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a circuit diagram showing the configuration of an embodiment of an oscillator circuit according to the present invention. In this example, the steady drive voltage is set to a value lower than the oscillation start voltage. 3, the same elements as those shown in FIG. 2 are designated by the same reference numerals as those used in FIG. The DC power supply 11 is connected in parallel to the first constant voltage circuit 13 and the second constant voltage circuit 13 via the power switch 12. First constant voltage circuit 1
3 is a variable constant voltage circuit, the output terminal of which is an amplifier 1
Connect to. A parallel circuit of a crystal oscillator 2 and a resistor 3 is connected to the feedback circuit for the amplifier 1, and both ends of the crystal oscillator are grounded via capacitors 4 and 5, respectively.
The amplifier 1 is composed of a C-MOS inverter, and the crystal oscillator 2 has a fundamental frequency of 12.8 MHz. Also, the resistance 3 is 1 MΩ, and the capacitors 4 and 5 are both 33
It was set to PF. The output terminal of amplifier 1 is connected to the input terminals of control amplifier 17 and output amplifier 18 via resistors 15 and 16, respectively. The output terminal of the control amplifier 17 is connected to the input terminal of the control circuit 19, and the output terminal of this control circuit is connected to the control terminal of the first constant voltage circuit 13. Also,
The output terminal of the output amplifier 18 is connected to the output terminal 21 of the oscillation circuit via the coupling capacitor 20. The output terminal of the second constant voltage circuit 14 is connected to the power supply terminals of the control amplifier 17, the output amplifier 18, and the control circuit 19.

The first constant voltage circuit 13 has a starting voltage E1 higher than the oscillation start voltage E S of the crystal unit 2 and a steady drive voltage E2 lower than the oscillation start voltage E and higher than the oscillation stop voltage E E. Two types of voltage are configured to be selectively generated according to a signal from the control circuit 19. In this example, the value of the steady drive voltage E2 is set to a value slightly higher than the oscillation stop voltage E E. Immediately after the power switch 12 is closed, the starting voltage E1 higher than the oscillation start voltage E S is applied to the amplifier 1 from the first constant voltage circuit 13, the crystal resonator 2 starts to vibrate, and the oscillation signal becomes Appears at point P. This oscillation signal is supplied to the control circuit 19 via the resistor 15 and the control amplifier 17. The control circuit 19 detects the level of this oscillation signal, outputs a control signal to the first constant voltage circuit 13 when it exceeds a predetermined reference level, and outputs a constant signal from this first constant voltage circuit. The voltage is switched to the steady drive voltage E2 which is set sufficiently lower than the oscillation start voltage E S and slightly higher than the oscillation stop voltage E E. As described above, even if the drive voltage is switched to such a low value, the oscillation of the crystal unit 2 does not stop, and the oscillation can be continued stably.

In the present embodiment, the oscillation signal of the crystal unit 1 is detected in this way, and when the oscillation signal exceeds the reference level, the drive voltage is switched to a low value.
The oscillation signal appearing at the point P is supplied to the output terminal 21 via the resistor 16, the output amplifier 18, and the coupling capacitor 20, and is supplied from this to another circuit as an oscillation output. As in this example, when the oscillation signal is monitored and the driving voltage is reduced when the oscillation signal becomes a predetermined level or more, a control circuit and the like are added as compared with the conventional oscillation circuit. However, even when the power for driving such a control circuit is included, the power consumption can be reduced to 1/3 or less as compared with the conventional oscillation circuit.

FIG. 4 shows a specific configuration of the control circuit 19 shown in FIG. 3, but the control circuit of the present invention is not limited to that shown in FIG. 4 and has a predetermined function. Any structure can be used as long as it fulfills the purpose. Further, FIG. 5 shows a voltage waveform appearing in FIG. The oscillation signal (the voltage waveform of which is shown as V A in FIG. 5A) output from the control amplifier 17 (see FIG. 3) is supplied to the diode 23 through the differentiating circuit 22 and rectified (the rectified waveform is shown as V B in FIG. 5B). (Shown) and further integrated by the integrating circuit 24 (integrated waveform is shown by V C in FIG. 5C), and this is applied to the amplifier 25. The amplifier 25 is constructed so as to generate an output signal when an input whose level exceeds its input voltage level is about 1/2 of the level when the oscillation signal is constantly generated. Therefore, FIG.
The output signal V D is generated at the timing shown in D.

The output signal V D generated by the control circuit 19 in this manner is supplied to the first constant voltage circuit 13. The first constant voltage circuit 13 comprises a switch 26 driven by the output signal V D. The first contact of the switch 26 is connected to the connection point Q between the control terminal of the constant voltage circuit 27 and the cathode of the Zener diode 28, and the second contact is grounded. The anode of the Zener diode 28 is also grounded. The Zener diode 28 generates a voltage V1 between its anode and cathode, and the constant voltage circuit 27 is configured to generate a voltage V2 between its output terminal and the connection point Q.

Immediately after the power switch 12 (see FIG. 3) is turned on, the level of the output signal V D from the amplifier 25 is low, so the switch 26 is in the off state, and the Zener diode 28 has an anode-cathode portion. Since they are not short-circuited, the sum of the voltages V1 and V2 is generated on the output conductor 13a of the first constant voltage circuit 13. This sum voltage is applied to the amplifier 1 as the starting voltage E1 as shown in FIG. 5E, and the crystal oscillator 2 oscillates. When the crystal unit 2 starts oscillating and the output signal V D of the control circuit 19 rises, the switch 26 is turned on, and the anode and cathode of the Zener diode 28 are short-circuited. Therefore, only the voltage V2 appears on the output conductor 13a of the first constant voltage circuit 13. This voltage V2 is applied to the amplifier 1 as a steady drive voltage E2 slightly higher than the oscillation stop voltage as shown in FIG. 5E. As described above, in the present invention, even if the steady drive voltage E2 is set to such a low value, the oscillation of the crystal resonator 2 does not stop, and the oscillation output of the predetermined frequency can be stably generated. ..

In the above-described embodiment, the starting voltage E1 considerably higher than the oscillation starting voltage is applied at the time of starting, and the steady drive voltage E2 after oscillation is set to a value slightly higher than the oscillation stopping voltage. It is necessary to have a circuit configuration in which the drive voltage is switched when the oscillation output is detected. However, in the present invention, the starting voltage E1 is set as shown in FIG.
It is also possible to set both the steady drive voltage E2 and the steady drive voltage E2 to a voltage slightly higher than the oscillation start voltage E S. In this case, it is not necessary to switch the drive voltage, and it suffices that the drive voltage is kept constant after the power is turned on. However, when setting the drive voltage too high,
Since the effect of reducing the power consumption is not sufficiently obtained and the temperature stability of the frequency deviation is impaired as described later, the oscillation start voltage E S is up to 1.5 times. That it is, in the present invention, 1 the constant drive voltage V2 of the oscillation start voltage E S.
Set to a value from 5 times the value to oscillation stop voltage E E.

FIG. 7 shows the configuration of another embodiment of the oscillator circuit according to the present invention. The same elements as those shown in FIGS. 2 and 4 are designated by the same reference numerals. In this example,
After rectifying the oscillation signal appearing at the point P with the diode 23,
As in the above-described embodiment, the amplifier 25 amplifies the signal, and the output signal of the amplifier 25 drives the switch 26 provided in the constant voltage circuit 13 to switch the value of the drive voltage output from the constant voltage circuit. Is. That is, immediately after the power switch 12 is turned on, the switch 26 is turned off to generate the starting voltage E1 which is sufficiently higher than the oscillation start voltage, and after the crystal oscillator 2 starts to oscillate, this is detected and the switch 12 is turned off. In order to generate a steady drive voltage E2 slightly higher than the oscillation stop voltage. In this example, the oscillation signal appearing at the point P passes through the coupling capacitor 20 and the output amplifier 3 having the FET 32, the output transformer 33, and the like.
4 to obtain an oscillation output.

FIG. 8 shows the temperature characteristics of the driving voltage and the driving current measured by the voltmeter 35 and the ammeter 36 and the output voltage of the output amplifier 34 in the embodiment shown in FIG. 7, respectively. The temperature was changed from -50 ℃ to 100 ℃. Thus, it was confirmed that the oscillator circuit according to the present invention operates stably even when the temperature is changed over a wide range. Also, the rise of oscillation was good at all temperatures. For example, at −50 ° C., the drive voltage was cut off to temporarily stop the oscillation, and then the power switch was turned on again to start stable operation.

FIGS. 9 to 15 show the temperature characteristics of frequency stability, showing the frequency shift (Δf / f) when the temperature is changed in the range of 0 ° C. to 60 ° C. on the vertical axis. And the steady drive voltage is 1.1V, 1.3V, 1.4V, 1.6V, 2.0V, 3.
It was changed to 0V and 5.0V. The oscillation starting voltage in the oscillator circuit used in this experiment was 1.52V. In the present invention, the steady drive voltage is set to 1.5 times the oscillation start voltage.
It is set within the range from the double value to a value slightly higher than the oscillation stop voltage, but when the steady drive voltage is within this range, that is, within 1.1V to 2.0V, the frequency deviation is Although within the range of ± 2PPM, when a drive voltage exceeding 2.0V is applied, the frequency deviation greatly exceeds the range of ± 2PPM. As described above, according to the present invention, it was confirmed that not only the consumption current can be reduced but also the frequency characteristic can be improved by lowering the steady drive voltage than the conventional drive voltage.

FIG. 16 shows the temperature dependence of the oscillation start voltage, the drive current at the start of oscillation, the oscillation stop voltage, and the drive current immediately before the oscillation stop in an oscillation circuit having a crystal oscillator. It was changed in the range of 70 ° C. It was confirmed that the oscillation start voltage and the oscillation start current change greatly with the temperature change, but the oscillation stop voltage and the current just before the oscillation stop change little with the temperature change. In the present invention, since the steady drive voltage is set to a value lower than the oscillation start voltage, it can be seen that the operation is stable with respect to temperature changes.

FIG. 17 shows another embodiment of the oscillator circuit according to the present invention, which uses a crystal oscillator which operates with overtone as described in US Pat. No. 4,716,332 of the present applicant. It is a graph which shows a drive voltage-drive current characteristic. When the drive voltage is gradually increased and becomes higher than the oscillation start voltage E S , the crystal unit first starts to oscillate with the fundamental wave, and the drive voltage is further increased,
When the overtone oscillation start voltage E T is exceeded, oscillation starts with overtone. After that, when the driving voltage is lowered, the oscillation is stably continued with an overtone up to the oscillation stop voltage E E. Therefore, when using such a crystal unit, after the power switch is turned on as the starting voltage, the starting voltage E1 higher than the overtone oscillation starting voltage E T is applied, and after the oscillation in the overtone,
It can be seen that the steady drive voltage E2 may be configured to be applied with a voltage within a range from a value 1.5 times E T to a value slightly higher than the oscillation stop voltage E E. In this case, if the steady drive voltage E2 is set to a value slightly higher than the oscillation stop voltage E E, the power consumption becomes significantly smaller than that of the conventional oscillation circuit, and the effect of the present invention becomes extremely large.

The present invention is not limited to the above-mentioned embodiments, but various changes and modifications can be added. For example, in the above-described embodiment, the starting voltage is set sufficiently higher than the oscillation starting voltage and the steady driving voltage is set to a value slightly higher than the oscillation stopping voltage, or both the starting voltage and the steady driving voltage are started. It was set to a value higher than the voltage and lower than 1.5 times the value, but the starting voltage was set to a value slightly higher than the oscillation start voltage, and the steady drive voltage was slightly higher than the oscillation stop voltage. Alternatively, the starting voltage may be set to a value sufficiently higher than the oscillation start voltage, and the steady drive voltage may be set to a value slightly lower than the oscillation start voltage. Further, when the starting voltage is set to a value sufficiently higher than the oscillation start voltage, and the steady drive voltage is set to a value slightly higher than the oscillation stop voltage, the level of the oscillation signal is detected in the above-mentioned embodiment, Although the driving voltage is lowered when this exceeds a certain reference level, the driving voltage is lowered after a predetermined time has passed without detecting the level of the oscillation signal after applying the starting voltage. A circuit configuration can also be adopted.

[0023]

As described above, in the oscillator circuit according to the present invention, the drive voltage is lowered to a value lower than the starting voltage after the crystal oscillator is oscillated by applying a voltage equal to or higher than the starting voltage, or the oscillation is started. Since a crystal oscillator is oscillated by applying a voltage slightly higher than the voltage, it is possible to reduce power consumption as compared with a conventional oscillator circuit. For example, when applied to a portable device, Battery consumption can be reduced. In addition, since the voltage during steady drive can be made significantly lower than before, overdrive of the crystal unit does not occur, the rise time of the temperature of the crystal unit is suppressed, and the oscillation frequency is stable in a short time. Will be done. Further, by lowering the driving voltage, the movement and displacement of the crystal lattice inside the crystal resonator are reduced, and there is an advantage that long-term stability is also improved. Furthermore, even if there is a discontinuity in the frequency characteristics or crystal impedance of the crystal unit, the change is small because the drive voltage is low.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a basic configuration of an oscillation circuit having a crystal oscillator.

FIG. 2 is a graph showing a relationship between the driving voltage and the driving current, similarly.

FIG. 3 is a block diagram showing a configuration of an embodiment of an oscillator circuit according to the present invention.

FIG. 4 is a circuit diagram showing a detailed configuration of the control circuit and the first constant voltage circuit of the same.

5A to 5E are signal waveform diagrams for similarly explaining the operation.

FIG. 6 is a graph showing a drive voltage range in another embodiment of the oscillator circuit according to the present invention.

FIG. 7 is a circuit diagram showing the same structure.

FIG. 8 is a graph showing temperature characteristics of the drive voltage, drive current, and oscillation output of the same.

FIG. 9 is a graph showing a temperature characteristic of frequency deviation when a driving voltage is 1.1V.

FIG. 10 is a graph showing a temperature characteristic of frequency deviation when a driving voltage is 1.3V.

FIG. 11 is a graph showing a temperature characteristic of frequency deviation when a driving voltage is 1.4V.

FIG. 12 is a graph showing a temperature characteristic of frequency deviation when a driving voltage is set to 1.6V.

FIG. 13 is a graph showing a temperature characteristic of frequency deviation when a driving voltage is 2.0V.

FIG. 14 is a graph showing a temperature characteristic of frequency deviation when a driving voltage is 3.0V.

FIG. 15 is a graph showing a temperature characteristic of frequency deviation when a driving voltage is 5.0V.

FIG. 16 is a graph showing temperature characteristics of an oscillation start voltage, an oscillation start current, an oscillation stop voltage, and a drive current immediately before the oscillation stop.

FIG. 17 is a graph showing drive characteristics in still another embodiment of the oscillator circuit according to the present invention.

[Explanation of symbols]

 1 Amplifier 2 Crystal Oscillator 11 DC Power Supply 12 Power Switch 13 First Constant Voltage Circuit 14 Second Constant Voltage Circuit 19 Control Circuit 23 Diode 25 Amplifier 26 Switch 27 Power Supply Circuit 28 Zener Diode 34 Output Circuit

Claims (4)

[Claims]
1. In an oscillation circuit in which a crystal oscillator is connected to an amplifier and a feedback circuit connected between the input and output of the amplifier, a steady drive voltage applied to the oscillation circuit is a voltage at which the crystal oscillator starts oscillation. The oscillation having a crystal resonator is set to a value between a voltage in the vicinity of the oscillation start voltage and an oscillation stop voltage, which is the voltage at which the oscillation stops when the drive voltage is reduced. circuit.
2. The steady drive voltage is set to about the oscillation start voltage.
The oscillation circuit having a crystal resonator according to claim 1, wherein the oscillation circuit is set to a value between 1.5 times the voltage and an oscillation stop voltage.
3. The steady drive voltage is an oscillation start voltage,
It is set to a value between the oscillation stop voltage, a drive voltage higher than the oscillation start voltage is applied at the time of startup, and a steady drive voltage lower than the oscillation start voltage is generated after startup. An oscillation circuit having the crystal oscillator according to 2.
4. The oscillator circuit having a crystal resonator according to claim 3, wherein the steady drive voltage is set to a value slightly higher than an oscillation stop voltage.
JP4017932A 1992-02-03 1992-02-03 Driving method of oscillation circuit having crystal oscillator Expired - Fee Related JP2608221B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4017932A JP2608221B2 (en) 1992-02-03 1992-02-03 Driving method of oscillation circuit having crystal oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4017932A JP2608221B2 (en) 1992-02-03 1992-02-03 Driving method of oscillation circuit having crystal oscillator

Publications (2)

Publication Number Publication Date
JPH05218740A true JPH05218740A (en) 1993-08-27
JP2608221B2 JP2608221B2 (en) 1997-05-07

Family

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Family Applications (1)

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Country Status (1)

Country Link
JP (1) JP2608221B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0724331A1 (en) * 1995-01-30 1996-07-31 Nec Corporation Semiconductor integrated circuit having low power consumption oscillator
WO1998032218A1 (en) * 1997-01-22 1998-07-23 Seiko Epson Corporation Oscillation circuit, electronic circuit, semiconductor device, electronic equipment and clock
US6133801A (en) * 1996-04-23 2000-10-17 Nec Corporation Crystal oscillation circuit
JP2009290380A (en) * 2008-05-27 2009-12-10 Kyocera Kinseki Corp Oscillator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6028161A (en) * 1983-07-25 1985-02-13 Japan Storage Battery Co Ltd Paste type lead storage battery

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6028161A (en) * 1983-07-25 1985-02-13 Japan Storage Battery Co Ltd Paste type lead storage battery

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0724331A1 (en) * 1995-01-30 1996-07-31 Nec Corporation Semiconductor integrated circuit having low power consumption oscillator
US5719534A (en) * 1995-01-30 1998-02-17 Nec Corporation Semiconductor integrated circuit having low power consumption oscillator
US6133801A (en) * 1996-04-23 2000-10-17 Nec Corporation Crystal oscillation circuit
WO1998032218A1 (en) * 1997-01-22 1998-07-23 Seiko Epson Corporation Oscillation circuit, electronic circuit, semiconductor device, electronic equipment and clock
US6097257A (en) * 1997-01-22 2000-08-01 Seiko Epson Corporation Crystal oscillator circuit having transistor with back gate voltage control
JP2009290380A (en) * 2008-05-27 2009-12-10 Kyocera Kinseki Corp Oscillator

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