JP5140944B2 - Oscillation circuit and control method thereof - Google Patents

Oscillation circuit and control method thereof Download PDF

Info

Publication number
JP5140944B2
JP5140944B2 JP2006134342A JP2006134342A JP5140944B2 JP 5140944 B2 JP5140944 B2 JP 5140944B2 JP 2006134342 A JP2006134342 A JP 2006134342A JP 2006134342 A JP2006134342 A JP 2006134342A JP 5140944 B2 JP5140944 B2 JP 5140944B2
Authority
JP
Japan
Prior art keywords
oscillation circuit
charge
circuit
input terminal
coil
Prior art date
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.)
Expired - Fee Related
Application number
JP2006134342A
Other languages
Japanese (ja)
Other versions
JP2007306421A (en
Inventor
玲 吉川
Original Assignee
株式会社リコー
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 株式会社リコー filed Critical 株式会社リコー
Priority to JP2006134342A priority Critical patent/JP5140944B2/en
Publication of JP2007306421A publication Critical patent/JP2007306421A/en
Application granted granted Critical
Publication of JP5140944B2 publication Critical patent/JP5140944B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Description

  The present invention relates to an oscillation circuit and a control method thereof.

  Crystal oscillator circuits mounted on portable electronic devices are required to have low power consumption from the standpoint of extending the life of the battery, and so far, such as changing the drive power according to the operating state of the oscillation circuit. Technology has been proposed.

  FIG. 7 shows an oscillation stop detection device disclosed in Patent Document 1 as a first conventional example. FIG. 8 shows a frequency test circuit used in the apparatus, and FIG. 9 shows an oscillation circuit used in the apparatus. An oscillation circuit as a second conventional example is shown in FIG.

  In the oscillation stop detection apparatus shown in FIG. 7, the output (output waveform) 104 of the oscillation circuit 501 is input to the Schmitt circuit 107, the output 105 of the Schmitt circuit 107 is input to the frequency verification circuit 103, and the output of the frequency verification circuit 103 is output. By inputting 106 to the oscillation circuit 501, a state immediately before the output amplitude is attenuated and oscillation is stopped is detected.

More specifically, the output 104 of the oscillation circuit 501 is first input to the Schmitt circuit 107 and converted into a rectangular wave output 105.
Next, in the frequency test circuit shown in FIG. 8, the rectangular wave 105 and the rectangular wave 309 delayed by the delay element 304 are input to the exclusive OR 303 to be twice the oscillation circuit output 104 (see FIG. 7). A rectangular wave 308 having a frequency of is obtained.
This output 308 controls on / off of the N-channel MOS transistor 307. When the N-channel MOS transistor 307 repeats the conduction / non-conduction state periodically, the drain voltage becomes low and the non-conduction state is continued. Therefore, when the amplitude of the output 104 of the oscillation circuit 501 (see FIG. 7) attenuates and becomes less than the Schmitt width of the Schmitt circuit 107 (see FIG. 7), the signal 106 The level is going to rise.

  9 includes the vibrator 206, a resistor 203 connected to both terminals 204 and 205 of the vibrator 206, a resistor 202 having one end (the left end in the figure) connected to the terminal 205, and an input. A main oscillation inverter 201 having an end connected to the terminal 204 and an output end connected to the other end of the resistor 202 (in this case, the right end), and a sub oscillation inverter 601 connected in parallel to the oscillation inverter 201. The sub oscillation inverter 601 is driven according to the signal from the oscillation stop detection device. The oscillator 206 and the amplifier circuit 101 constitute an oscillation circuit 501 (see FIG. 7).

  With the above configuration, the power consumption of the oscillation device during average operation is designed to be low, and when the oscillation device reaches a state immediately before stopping, the sub oscillation inverter 601 is operated to lower the actual oscillation stopping voltage. It becomes possible to make it.

FIG. 10 shows an oscillation circuit disclosed in Patent Document 2 as a second conventional example.
The oscillation circuit shown in the figure includes a P-channel MOS transistor 40, a vibrator 14, a resistor 17, load capacitors 15 and 16, a signal inverting amplifier 1 including a P-channel MOS transistor 12 and an N-channel MOS transistor 13, And a power control unit circuit 60 that controls the drive voltage Vreg of the signal inverting amplifier 1 according to the oscillation output. The power control unit circuit 60 further outputs a plurality of voltages Vreg1 to Vreg4 having different voltages. 66, a determination control unit 68 that determines an optimum value of the voltage Vreg that drives the signal inverting amplifier 1 based on the oscillation output, and a voltage that is supplied from the power supply voltage generation circuit 66 to the signal inverting amplifier 1 based on the determination result. And a multiplexer 82.
The power control unit circuit 60 includes inverters 62 and 64, a power supply voltage generation circuit 66, and a multiplexer 82.
The determination control unit 68 includes flip-flops 70, 72, and 80, a coincidence detection circuit 74, and NAND gates 75, 76, and 77.

The operation of this circuit is as follows.
The output of the signal inverting amplifier 1 is input to two inverters 62 and 64 having different thresholds, and the number of pulses output from both inverters 62 and 64 is counted and compared every four cycles of oscillation output. At this time, the threshold value VGL1 of the inverter 62 is Vreg / 2, whereas the threshold value VGL2 of the inverter 64 is set to a predetermined logic level (in the vicinity of Vreg in Japanese Patent No. 3379422).

Therefore, when the amplitude of the oscillation output reaches substantially the drive voltage, the number of pulses output from both the inverters 62 and 64 coincides, but when the oscillation is unstable and the amplitude tends to attenuate, the output pulse of the inverter 64 The number decreases. This output pulse is detected by the coincidence detection circuit 74, and when the output pulse of the inverter 64 is small, an up count signal is sent to the up / down counter 80, and a multiplexer is selected so that a voltage one higher than the current drive voltage Vreg is selected. 82 is controlled.
On the contrary, if the number of pulses matches, a down count signal is sent to the up / down counter 80, and the multiplexer 82 is controlled so that a voltage one lower than the current drive voltage Vreg is selected. ing.
JP-A-5-29885 Japanese Patent No. 3379422

  By the way, when the oscillation circuit is composed of two types of oscillation inverters 201 and 601 as in the first conventional example, in order to set the oscillation start time to an appropriate value, the power consumption in the sub oscillation inverter 601 is set large. There is a need to.

  Therefore, even if an inverter of such a size is used as an auxiliary means and the stop voltage can be lowered, there may be a problem that the battery will be consumed in a short period thereafter. In other words, it is difficult to obtain an optimum value according to the situation by switching methods of about two types of inverters, and there are problems such as an area for preparing a plurality of inverters and an increase in current paths in the oscillation stop detection device.

In the second conventional example, the drive voltage is switched step by step while monitoring the output amplitude. Therefore, when a large number of drive voltages can be set, there is a possibility that it is possible to meticulously cope with fluctuations due to the ambient environment and manufacturing variations of the oscillation circuit. However, the circuit scale for realizing this is considerably large.
In addition, any of the above conventional examples is a method for controlling the driving capability of the oscillation circuit discontinuously, and there is a concern about the influence on the oscillation operation due to noise generated at the time of switching and overshoot and undershoot generated in the drive voltage. .

  Accordingly, an object of the present invention is to overcome the problems left by the above-described existing oscillation circuit, and continuously control the driving power of the amplifying means to ensure the oscillation start-up time and the operational stability. An object of the present invention is to provide an oscillation circuit and a control method thereof that can efficiently reduce power consumption in a steady state.

First aspect of the present invention, the inserted current control means and the amplification means, connected oscillator via a resistor between the input and output terminals of said amplifying means and the load capacitance between the power supply terminal and ground Charging / discharging current monitoring means for monitoring the charging / discharging current of the load capacity, a coil through which a current linked to the charging / discharging current flows, and a rectifying diode for converting electric energy generated in the coil into a DC voltage has a smoothing capacitor, and a bleeder resistor, the input terminal of the charging and discharging current monitoring means is connected to an input terminal of said amplifying means, said charging and discharging current monitoring means, at least one constituting the front Symbol amplifying means The transistors are of the same conductivity type, and the power supply terminal and the output terminal of the charge / discharge current monitoring means are connected via the coil, and the coil and the charge / discharge current monitoring means A parallel circuit of the smoothing capacitor and the bleeder resistor is connected between the connection node to the power terminal and the power supply terminal via the diode, and the voltage stored in the smoothing capacitor Is input to the input terminal of the current control means to control the driving power of the oscillation circuit body.

  According to the present invention, since the driving power of the oscillation circuit is controlled according to the charge / discharge current to the load capacitance driven by the oscillation circuit, the oscillation start time and the stability of the oscillation are not sacrificed at a steady state. Power consumption can be effectively reduced. In the system adopting the present invention, it is possible to supply the oscillation circuit with the optimum electric power according to the change in the environment, and the entire system can save energy and extend the battery life.

  One embodiment of an oscillation circuit according to the present invention monitors an oscillation circuit body, a load capacity driven by the oscillation circuit body, a charge / discharge current of the load capacity, and oscillates according to the amount of the charge / discharge current. And a control circuit for controlling the driving power of the circuit body.

  According to the above configuration, since the driving power of the oscillation circuit is controlled in accordance with the charge / discharge current to the load capacitance driven by the oscillation circuit, the oscillation start time and the stability of the oscillation are not sacrificed at a steady state. Power consumption can be effectively reduced. In the system adopting the present invention, it is possible to supply the oscillation circuit with the optimum electric power according to the change in the environment, and the entire system can save energy and extend the battery life.

  In another embodiment of the oscillation circuit according to the present invention, in addition to the above configuration, the control circuit allows the monitoring component of the charge / discharge current to the load capacity to flow through the coil, and converts the magnetic energy generated in the coil into electrical energy. Thus, the drive power of the oscillation circuit main body is controlled.

  According to the above configuration, since the monitoring component of the charge / discharge current to the load capacity driven by the oscillation circuit is passed through the coil and the generated power due to the self-inductance is converted to control the drive power, the charge capacity to the load capacity is It is possible to define the discharge current with high accuracy, and as a result, it is possible to define the voltage level of the output amplitude.

  In another embodiment of the oscillation circuit according to the present invention, a current control means inserted between a power supply terminal and ground, a signal amplifying means, and an input / output terminal of the signal amplifying means are connected via a resistor. Vibrator and load capacity, charge / discharge current monitoring means for monitoring the charge / discharge current of the load capacity, a coil through which a current linked to the charge / discharge current flows, and electric energy generated in the coil for converting to DC voltage It has a rectifier diode, a smoothing capacitor, and a bleeder resistor. The input terminal of the charge / discharge current monitoring means is connected to the input terminal of the amplifier means, the common terminal of the current control means is connected to the power supply terminal, and the charge / discharge current The output terminals of the monitoring means are connected to the coils, respectively. Between the connection node between the coil and the output terminal of the charge / discharge current monitoring means and the power supply terminal, a parallel connection of a smoothing capacitor and a bleeder resistor is performed via a diode. There a connected structure, characterized in that so as to control the driving power of the oscillation circuit body by inputting the voltage stored in the smoothing capacitor to the input terminal of the current control means.

  According to the above configuration, it can be realized with a small number of elements.

  In another embodiment of the oscillation circuit according to the present invention, in addition to the above configuration, when the voltage stored in the smoothing capacitor is input to the input terminal of the current control means, it is performed via a low-pass filter. Features.

  According to the above configuration, since the drive power control signal can be smoothed, more stable oscillation can be obtained.

  Another embodiment of the oscillation circuit according to the present invention is characterized in that, in addition to the above configuration, the output of the oscillation circuit body is input to the input terminal of the current monitoring means via the waveform shaping means.

  According to the above configuration, since the energy generated in the coil can be increased, the coil size can be reduced and the drive power can be controlled.

  One embodiment of a method for controlling an oscillation circuit according to the present invention monitors the charge / discharge current of a load capacity driven by the oscillation circuit body, and determines the drive power of the oscillation circuit body according to the amount of the charge / discharge current. It is characterized by controlling.

  According to the above configuration, since the driving power of the oscillation circuit is controlled in accordance with the charge / discharge current to the load capacitance driven by the oscillation circuit, the oscillation start time and the stability of the oscillation are not sacrificed at a steady state. Power consumption can be effectively reduced. In the system adopting the present invention, it is possible to supply the oscillation circuit with the optimum electric power according to the change in the environment, and the entire system can save energy and extend the battery life.

  In another embodiment of the method for controlling an oscillation circuit according to the present invention, in addition to the above configuration, a monitoring component of charge / discharge current to the load capacity is passed through the coil, and the magnetic energy generated in the coil is converted into electrical energy. The driving power of the oscillation circuit main body is controlled.

  According to the above configuration, since the monitoring component of the charge / discharge current to the load capacity driven by the oscillation circuit is passed through the coil and the generated power due to the self-inductance is converted to control the drive power, the charge capacity to the load capacity is It is possible to define the discharge current with high accuracy, and as a result, it is possible to define the voltage level of the output amplitude.

  The above-described embodiment shows an example of a preferred embodiment of the present invention, and the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention. is there.

Next, Example 1 according to the present invention will be described.
FIG. 1 is a block diagram of a first embodiment of an oscillation circuit to which an oscillation circuit control method according to the present invention is applied.
The oscillation circuit shown in the figure is configured to monitor the charge / discharge current of the load capacitor CL that is driven by the oscillation circuit body 20 during the oscillation operation, and to control the drive power control circuit 10 according to the amount of the current.
More specifically, the charge / discharge current amount to the load capacity CL is specified, and if the current amount exceeds the value, the drive power is reduced, and if the current amount does not reach the specified current amount, the drive power is increased. doing.
According to this configuration, since the charge / discharge current amount is specified, it is possible to indirectly control the amplitude level of the oscillation output, and the amplitude is attenuated while avoiding consuming more power than necessary during steady oscillation. When it is necessary to increase the drive power as at the start of oscillation, the power is appropriately secured.

Next, a second embodiment according to the present invention will be described.
FIG. 2 is a block diagram of a second embodiment of an oscillation circuit to which the oscillation circuit control method according to the present invention is applied.
In this configuration, a current that is linked to the charge / discharge current to the load capacitor CL is supplied to the coil L1, and the magnetic energy generated in the coil L1 is converted into electric energy and used as a control signal for the drive power control circuit 10. According to the present invention, magnetic energy corresponding to the amount of current that changes per unit time is generated by the self-inductance of the coil L1, and therefore the change in the charge / discharge current to the load capacitor CL can be accurately captured with a relatively simple configuration. Is possible.

A third embodiment according to the present invention will be described.
FIG. 3 is a circuit diagram of a third embodiment of an oscillation circuit to which the method for controlling an oscillation circuit according to the present invention is applied.
In FIG. 3, the same reference numerals are used for the same components as those in the first embodiment and the second embodiment.
A depletion type P-channel MOS transistor M1 for supplying a drive current of the amplifier circuit in the drive power control circuit 10 and an N-channel MOS transistor M2 forming a source grounded amplifier circuit in the oscillation circuit body 20 are connected between power supply terminals (Vdd-Vss). Connected between the drain connection node of both MOS transistors M1 and M2 forming the output terminal and the gate of the N-channel MOS transistor M2 forming the input terminal, and a feedback resistor R1 for determining the operating point of the amplifier circuit A vibrator (crystal oscillator) Q1 as a circuit is connected, and load capacitors CL1 and CL2 for frequency adjustment are connected between the input / output terminal and the power supply terminal.
Further, as shown in the figure, a resistor R2 may be inserted between the output terminal and the vibrator Q1.

On the other hand, in the signal generation circuit 30, there is an N channel MOS transistor M3 having the same conductivity type as the N channel MOS transistor M2 of the oscillation circuit body 20, and the source of the N channel MOS transistor M3 is connected to one power source (Vss: ground). The drain is connected to the other power supply (Vdd) via the coil L1, and the gate is connected to the gate of the N-channel transistor M2 of the oscillation circuit 20.
A parallel circuit of a smoothing capacitor C3 and a bleeder resistor R3 is connected between the connection node of the N-channel MOS transistor M3 and the coil L1 and the power supply terminal via a rectifying diode D1, and the capacitor C3 and the diode D1. The control signal S1 is output from the connection terminal.

  In the above configuration, the control signal S1 is transmitted to the gate of the P-channel MOS transistor M1 of the drive power control circuit 10, but at this time, it is transmitted via the low-pass filter 40 for signal smoothing as shown in the figure. Also good.

The specific operation of this circuit is as follows.
First, immediately after the power is turned on, the oscillation circuit main body 20 is in a stopped state, the voltage of the input / output terminal is set to a value equal to the operating point of the amplifier circuit, and the P channel MOS transistor M1 and the N channel MOS transistor M2 have a temporal variation. There is no constant current flowing. In this case, no charging / discharging current is generated in the load capacitors CL1 and CL2, and there is no fluctuation in the current flowing through the coil L1 in the signal generation circuit 30, and all the charge charged in the capacitor C3 is discharged by the resistor R3. The voltage level of the control signal S1 is equal to the power supply voltage (Vdd).
Therefore, at this time, the P-channel MOS transistor M1 of the drive power control circuit 10 is supplied with the maximum gate voltage, Vgs1 = 0 in any operating state, and the amplifier circuit is driven with the preset maximum drive current. . Note that the maximum drive current value at this time is determined in consideration of margins for manufacturing variations and environmental variations.

  Next, when oscillation starts, an amplitude is generated at the output terminal by the amplification action of the N-channel MOS transistor M2, and a charge / discharge current to the load capacitors CL1 and CL2 is generated accordingly. Then, the amount of change per unit time of the current flowing through the coil L1 increases according to the monitoring ratio of the N-channel MOS transistor M2 and the N-channel MOS transistor M3, and energy (magnetic energy) corresponding to the self-inductance and charge / discharge current of the coil L1. Is generated in the coil L1. This magnetic energy raises the terminal voltage of the capacitor C3 via the diode D1 every time the N-channel MOS transistor M3 is turned off, but the amount of charge does not exceed the discharge capacity determined by the values of the capacitor C3 and the resistor R3. As long as all charges are discharged in one cycle, the drive current is not reduced and the output amplitude continues to grow.

  However, when the output amplitude grows sufficiently and the charge supply to the capacitor C3 exceeds the discharge capability, the terminal voltage of the capacitor C3 increases and the gate voltage Vgs1 of the P-channel MOS transistor M1 decreases every cycle. As a result, the drive current is reduced. When the drive current is reduced, the transconductance of N-channel MOS transistor M2 (transconductance: the ratio of the change in drain current to the change in gate voltage) is reduced, the gain of the amplifier circuit is reduced, and the amount of attenuation in the feedback circuit is below The output amplitude is attenuated.

  On the other hand, if the output amplitude is attenuated more than necessary, the charge / discharge currents to the load capacitors CL1 and CL2 are reduced, and the amount of change per unit time of the current flowing through the coil L1 is reduced, so that the magnetic energy generated in the coil L1 Is less than the discharge capacity. Then, the terminal voltage of the capacitor C3 decreases, the gate voltage Vgs1 of the P-channel MOS transistor M1 increases, and this time again increases the drive current of the amplifier circuit.

Since the operation as described above is continuously controlled, the charge / discharge current to the load capacity in the unit cycle can be defined, and as a result, the output amplitude can be defined.
That is, this circuit functions to define the output amplitude of the oscillation circuit body 20 and continuously give the amplifier circuit the minimum gain (≈1 times) necessary to maintain the amplitude. Further, in these series of operations, the electric charge stored in the capacitor C3 of the signal generation circuit 30 is taken out from the power supply terminal and discharged again to the power supply terminal, so that power consumption other than the N channel MOS transistor M3 as the monitoring means is consumed. There is no.

  By adopting the present invention, the system can avoid continuously supplying power to the oscillation circuit more than necessary in a steady state, and the power control is continuously performed, so that a finer optimal value than the conventional example can be obtained.

Example 4 according to the present invention will be described.
FIG. 4 is a circuit diagram of a fourth embodiment of an oscillation circuit to which the method for controlling an oscillation circuit according to the present invention is applied.
In this circuit, the amplifying means of the oscillation circuit main body 20 is configured by a complementary inverter (CMOS inverter) of a P-channel MOS transistor M21 and an N-channel MOS transistor M2, and other configurations and operations are the same as in the third embodiment. Therefore, the description is omitted.

  5 and 6 show circuit diagrams of fifth and sixth embodiments of the oscillation circuit to which the method for controlling an oscillation circuit according to the present invention is applied.

  The oscillation circuit shown in FIG. 5 has substantially the same configuration as that of the third and fourth embodiments, and includes waveform shaping means 50 for shaping the output waveform of the oscillation circuit body 20 without changing the amplitude level. Through the gate of the N channel MOS transistor M3 as current monitoring means.

  Since the energy generated in the coil L1 is proportional to the differential value of the current that changes with time, it can be expected that a larger energy is obtained by shaping the output waveform. Therefore, in this oscillation circuit, the output waveform of the oscillation circuit main body 20 is shaped and input to the current monitoring means M3. However, since the amplitude level is not changed when shaping the waveform, Energy corresponding to the output amplitude can be obtained. Of course, the waveform shaping means 50 is not limited to the configuration shown in the figure, and various known circuits can be used as long as they achieve the purpose.

  The oscillation circuit shown in FIG. 6 has substantially the same configuration as that of the third and fourth embodiments, and includes waveform shaping means 50 for shaping the output waveform of the oscillation circuit body 20 without changing the amplitude level. The point of inputting to the gate of the current monitoring means M3 is different. The oscillation circuit shown in FIG. 6 differs from the fifth embodiment in that a P-channel MOS transistor M21 is inserted between the current monitoring means M2 and the drive power control circuit 10.

  Since the energy generated in the coil L1 is proportional to the differential value of the current that changes with time, it can be expected that a larger energy is obtained by shaping the output waveform. Therefore, in this oscillation circuit, the output waveform of the oscillation circuit main body 20 is shaped and input to the current monitoring means M3. However, since the amplitude level is not changed in shaping the waveform, the output of the oscillation circuit main body is used. Energy corresponding to the amplitude can be obtained. Of course, the waveform shaping means 50 is not limited to the configuration shown in the figure, and various known circuits can be used as long as they achieve the purpose.

  The present invention can be used for various portable electronic devices that are required to have low power consumption.

1 is a block diagram of a first embodiment of an oscillation circuit to which an oscillation circuit control method according to the present invention is applied. FIG. It is a block diagram of 2nd Example of the oscillation circuit to which the control method of the oscillation circuit which concerns on this invention is applied. FIG. 6 is a circuit diagram of a third embodiment of an oscillation circuit to which the oscillation circuit control method according to the invention is applied. FIG. 10 is a circuit diagram of a fourth embodiment of an oscillation circuit to which the oscillation circuit control method according to the invention is applied. It is a circuit diagram of 5th Example of the oscillation circuit to which the control method of the oscillation circuit which concerns on this invention is applied. It is a circuit diagram of 6th Example of the oscillation circuit to which the control method of the oscillation circuit which concerns on this invention is applied. It is a circuit diagram which shows the oscillation stop detector as a 1st prior art example. FIG. 8 is a circuit diagram of the frequency test circuit shown in FIG. 7. FIG. 8 is a circuit diagram of the oscillation circuit shown in FIG. 7. It is a circuit diagram which shows the oscillation circuit as a 2nd prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Drive power control circuit 20 Oscillation circuit main body 30 Signal generation circuit 40 Low pass filter 50 Waveform shaping circuit CL, CL1, CL2 Load capacity D1 Diode L1 Coil M1, M2, M3, M21 MOS transistor Q1 Oscillator R1, R2, R3 Resistance

Claims (6)

  1. Current control means inserted between the power supply terminal and ground;
    Amplifying means;
    A vibrator and a load capacity connected via a resistor between the input and output terminals of the amplification means;
    Charge / discharge current monitoring means for monitoring charge / discharge current of the load capacity;
    A coil through which a current linked to the charge / discharge current flows;
    A rectifier diode for converting electrical energy generated in the coil into a DC voltage, a smoothing capacitor, and a bleeder resistor;
    The input terminal of the charging / discharging current monitoring means is connected to the input terminal of the amplifying means, and the charging / discharging current monitoring means is composed of the same conductivity type transistor as at least one transistor constituting the amplifying means,
    The power supply terminal and the output terminal of the charge / discharge current monitoring means are connected via the coil, and the diode is between a connection node between the coil and the output terminal of the charge / discharge current monitoring means and the power supply terminal. A parallel circuit of the smoothing capacitor and the bleeder resistor is connected via
    An oscillation circuit characterized in that the driving power of the oscillation circuit body is controlled by inputting the voltage stored in the smoothing capacitor to the input terminal of the current control means.
  2.   2. The oscillation circuit according to claim 1, wherein when the voltage stored in the smoothing capacitor is input to the input terminal of the current control means, the voltage is supplied via a low-pass filter.
  3. Instead of connecting the input terminal of the charging / discharging current monitoring means to the input terminal of the amplifying means, the output of the amplifying means is input to the input terminal of the charging / discharging current monitoring means via a waveform shaping means . The oscillation circuit according to claim 1 or 2, wherein
  4. Current control means inserted between the power supply terminal and the ground, amplification means, vibrator and load capacitance connected via a resistor between the input / output terminals of the amplification means, and charge / discharge current of the load capacitance Charging / discharging current monitoring means for monitoring the current, a coil through which a current linked to the charging / discharging current flows, a rectifying diode, a smoothing capacitor, and a bleeder resistor for converting electric energy generated in the coil into a DC voltage; An input terminal of the charge / discharge current monitoring means is connected to an input terminal of the amplification means, and the charge / discharge current monitoring means comprises the same conductivity type transistor as at least one transistor constituting the amplification means. A power supply terminal and an output terminal of the charge / discharge current monitoring means are connected via the coil, and a connection node between the coil and the output terminal of the charge / discharge current monitoring means; A method for controlling an oscillator circuit a parallel circuit between the bleeder resistor and the smoothing capacitor via the diode is connected between the serial power supply terminal,
    A method for controlling an oscillation circuit, wherein the driving power of the oscillation circuit body is controlled by inputting a voltage stored in the smoothing capacitor to an input terminal of a current control means.
  5.   5. The driving power of the oscillation circuit body is controlled by performing a low-pass filter when inputting the voltage stored in the smoothing capacitor to an input terminal of a current control unit. Control method of oscillation circuit.
  6. Instead of connecting the input terminal of the charging / discharging current monitoring means to the input terminal of the amplifying means, the output of the amplifying means is input to the input terminal of the charging / discharging current monitoring means via the waveform shaping means. 6. The method for controlling an oscillation circuit according to claim 4, wherein the driving power of the oscillation circuit body is controlled.
JP2006134342A 2006-05-12 2006-05-12 Oscillation circuit and control method thereof Expired - Fee Related JP5140944B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006134342A JP5140944B2 (en) 2006-05-12 2006-05-12 Oscillation circuit and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006134342A JP5140944B2 (en) 2006-05-12 2006-05-12 Oscillation circuit and control method thereof

Publications (2)

Publication Number Publication Date
JP2007306421A JP2007306421A (en) 2007-11-22
JP5140944B2 true JP5140944B2 (en) 2013-02-13

Family

ID=38839969

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006134342A Expired - Fee Related JP5140944B2 (en) 2006-05-12 2006-05-12 Oscillation circuit and control method thereof

Country Status (1)

Country Link
JP (1) JP5140944B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009218871A (en) 2008-03-11 2009-09-24 Ricoh Co Ltd Voltage controlled oscillator
JP5318592B2 (en) * 2009-01-21 2013-10-16 ラピスセミコンダクタ株式会社 Constant current drive oscillation circuit
JP6111085B2 (en) * 2013-02-13 2017-04-05 セイコーNpc株式会社 Integrated circuit for oscillation
JP6276614B2 (en) * 2014-03-10 2018-02-07 シチズン時計株式会社 Radio clock

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5180751A (en) * 1975-01-11 1976-07-14 Citizen Watch Co Ltd Suishohatsushinkairo
JPS6036644B2 (en) * 1976-09-20 1985-08-21 Tokyo Shibaura Electric Co
JPH0334609A (en) * 1989-06-29 1991-02-14 Nec Corp Oscillating circuit
JPH0529885A (en) * 1990-08-10 1993-02-05 Seiko Epson Corp Oscillation stop detector and oscillator
JPH0563442A (en) * 1991-09-04 1993-03-12 Toyo Commun Equip Co Ltd Oscillation circuit
JP3132212B2 (en) * 1993-01-13 2001-02-05 日本電気株式会社 Crystal oscillation circuit
JP4668407B2 (en) * 2000-12-08 2011-04-13 京セラキンセキ株式会社 Angular velocity sensor
JP2003324319A (en) * 2002-05-01 2003-11-14 Risotetsuku Japan Kk Electronic circuit

Also Published As

Publication number Publication date
JP2007306421A (en) 2007-11-22

Similar Documents

Publication Publication Date Title
US6492862B2 (en) Charge pump type voltage conversion circuit having small ripple voltage components
US6744224B2 (en) Rush current limiting circuit for a PFM control charge pump
JP3962524B2 (en) Discharge control circuit
KR101017656B1 (en) Synchronous rectification switching regulator
KR100912865B1 (en) Switching regulator and semiconductor device using the same
US5694072A (en) Programmable substrate bias generator with current-mirrored differential comparator and isolated bulk-node sensing transistor for bias voltage control
US7202655B2 (en) Constant voltage circuit and constant current source, amplifier, and power supply circuit using the same
KR101055340B1 (en) Switching regulator and its operation control method
US8242760B2 (en) Constant-voltage circuit device
JP3614156B2 (en) Power circuit
JP5581921B2 (en) Regulator and DC / DC converter
US7068114B2 (en) Constant current circuit used for ring oscillator and charge pump circuit
KR101812931B1 (en) Method and apparatus of self-biased rc oscillator and ramp generator
US6943533B2 (en) Voltage conversion circuit, semiconductor integrated circuit device, and portable terminal
JP2639325B2 (en) Constant voltage generator
US7859324B2 (en) Power supply unit
JP4591892B2 (en) Power supply
TWI354195B (en) Voltage regulator
KR101025364B1 (en) Systems and methods for minimizing static leakage of an integrated circuit
JP4119784B2 (en) Power-on reset circuit
US7777474B2 (en) DC-DC converter with oscillator and monitoring function
TWI390825B (en) Voltage regulator
US6624619B2 (en) Stabilized power unit
CN102163834B (en) Switching control circuit
US7492232B2 (en) Oscillator circuit, semiconductor device and semiconductor memory device provided with the oscillator circuit, and control method of the oscillator circuit

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20090302

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20110829

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110927

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20111125

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120214

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120416

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120626

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120813

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20121023

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20121105

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20151130

Year of fee payment: 3

LAPS Cancellation because of no payment of annual fees