CN102237851B - Oscillation signal generation device and its correlation technique - Google Patents
Oscillation signal generation device and its correlation technique Download PDFInfo
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- CN102237851B CN102237851B CN201010151361.8A CN201010151361A CN102237851B CN 102237851 B CN102237851 B CN 102237851B CN 201010151361 A CN201010151361 A CN 201010151361A CN 102237851 B CN102237851 B CN 102237851B
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Abstract
The present invention relates to a kind of oscillation signal generation device and its correlation technique, this oscillation signal generation device includes an oscillating circuit and a control circuit, this control circuit is coupled to this crystal oscillator, this control circuit is used for when this oscillating circuit is in an operating mode to produce an output oscillation signal, producing a control signal switches to one to press down energy state from an enabled status vibration generator in this oscillating circuit, and carrys out this output oscillation signal as this oscillating circuit according to the oscillation signal that the crystal oscillator in this oscillating circuit produces.Oscillating circuit cuts out with the power consumption saving oscillating circuit by oscillation signal generation device after oscillating circuit success starting of oscillation again, and utilize crystal oscillator to produce one resonance signal exports oscillation signal as it, again oscillating circuit is started when the energy of this resonance signal that crystal oscillator produces is reduced to a predetermined extent, so reach the object reducing power consumption, and the chip area occupied is less.
Description
Technical field
The present invention relates to crystal oscillator correlative technology field, more particularly, relate to a kind of oscillation signal generation device and its correlation technique of low power consumption.
Background technology
In numerous clock generators, one crystal oscillator (also known as quartz (controlled) oscillator (CrystalOscillator)) produce reference clock and can have frequency of oscillation the most accurately, therefore crystal oscillator is widely used in most electronic installation.But in order to increase the stand-by time of electronic installation, the design of this crystal oscillator is gradually towards the future development of low transduction (gm), low current.So the area of this crystal oscillator is but caused to increase significantly, and then make this crystal oscillator trend towards comparatively unsure state.Furthermore, when this crystal oscillator has the circuit characteristic of low transduction and low current, this crystal oscillator is in higher temperatures or the shortcoming compared with just possibility circuit for generating not starting of oscillation during low supply voltage.Due to this crystal oscillator produce the clock source that running clock is all different frequency clocks in this electronic installation, therefore the saving current that traditional crystal oscillator adopts designs in some special situation, as high temperature or low pressure, this electronic installation will be caused to occur working as the situation of machine.Therefore, how to reduce the power consumption of this crystal oscillator to extend the service time of this electronic installation, and the stability simultaneously increasing this crystal oscillator has become a field person for this reason to need the problem of solution badly.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provides a kind of oscillation signal generation device and its correlation technique of low power consumption.
One of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of oscillation signal generation device, and this oscillation signal generation device includes an oscillating circuit and a control circuit.This oscillating circuit includes: a crystal oscillator has one first end points and one second end points, is used for generation one oscillation signal; One resistive element has this first end points that one first end points is coupled to this crystal oscillator, and one second end points is coupled to this second end points of this crystal oscillator; And one starting of oscillation utensil have an input endpoint to be coupled to this first end points of this crystal oscillator, and an exit point is coupled to this second end points of this crystal oscillator.This control circuit is coupled to this crystal oscillator, when this oscillating circuit is in an operating mode to produce an output oscillation signal, this control circuit produces a control signal and switches to one to press down energy state from an enabled status this vibration generator, and carrys out this output oscillation signal as this oscillating circuit according to this oscillation signal that this crystal oscillator produces.
Oscillation signal generation device of the present invention, wherein this vibration generator operates between one first supply voltage and one second supply voltage, and when this vibration generator be in this press down can state time, be in an open circuit (open-circuit) state between this vibration generator and this first voltage quasi position or this second voltage quasi position.
Oscillation signal generation device of the present invention, wherein this resistive element one transmits lock, when this vibration generator be in this press down can state time, this transmission lock is in a not on-state, and when this vibration generator is in this enabled status, this transmission lock is in a conducting state.
Oscillation signal generation device of the present invention, wherein this transmission lock is controlled by this control circuit.
Oscillation signal generation device of the present invention, wherein when this oscillating circuit is in this operating mode and this vibration generator is in this enabled status, this control circuit timing one scheduled time, and after arriving in this scheduled time, this vibration generator switches to this to press down energy state from this enabled status by this control signal of setting.
Oscillation signal generation device of the present invention, wherein when this oscillating circuit is in this operating mode and this vibration generator be in this press down can state time, this control circuit another timing one scheduled time, and after arriving in this scheduled time, this vibration generator presses down state can switch to this enabled status from this by this control signal of setting.
Oscillation signal generation device of the present invention, wherein this control circuit includes:
One clock counter, is used for counting the periodicity of this output oscillation signal to produce a count results; And
One decision circuitry, be coupled to this clock counter, be used for when this oscillating circuit is in this operating mode and this vibration generator is in this enabled status, judge whether this count results reaches one first predetermined period number, when this count results reaches this first predetermined period number, this decision circuitry produces this control signal and switches to this to press down the state of energy from the state of this activation this vibration generator.
Oscillation signal generation device of the present invention, wherein this decision circuitry separately in this oscillating circuit be in this operating mode and this vibration generator be in this press down can state time, judge whether this count results reaches one second predetermined period number, when this count results reaches this second predetermined period number, this decision circuitry separately sets this control signal and is pressed down state can switch to this enabled status from this by this vibration generator.
Oscillation signal generation device of the present invention, wherein this control circuit includes:
One peak is to peak (peak-to-peak) circuit for detecting, when this oscillating circuit is under this operating mode and this vibration generator is in this enabled status, a peak of this output oscillation signal is detected to peak value to peak circuit for detecting in this peak, and when reaching one first critical peak to peak value in this peak to peak value, this peak sets this control signal to peak circuit for detecting and switches to this to press down energy state from this enabled status this vibration generator.
Oscillation signal generation device of the present invention, wherein when this oscillating circuit is under this operating mode and this vibration generator be in this press down can state time, when this peak separately reaches one second critical peak to peak value in this peak to peak value to peak circuit for detecting, set this control signal and this vibration generator is pressed down state can switch to this enabled status from this.
Oscillation signal generation device of the present invention, wherein this control circuit includes:
One first numerical digit frequency eliminator, is coupled to this crystal oscillator, is used for carrying out the computing of signal frequency elimination to this output oscillation signal, to produce one first frequency elimination oscillation signal;
One second numerical digit frequency eliminator, is coupled to this first numerical digit frequency eliminator, is used for carrying out the computing of signal frequency elimination to this first frequency elimination oscillation signal, to produce one second frequency elimination oscillation signal; And
One logic lock, is coupled to this first digital frequency eliminator and this second digital frequency eliminator, is used for according to this first frequency elimination oscillation signal and this second frequency elimination oscillation signal to set this control signal.
Oscillation signal generation device of the present invention, wherein this control signal includes one first control signal and one second control signal, and this vibration generator includes:
One first switch, has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first control signal;
One the first transistor, has one second end points that a control point end is coupled to this first switch;
One second switch, have this control end points that one first end points is coupled to this first transistor, one second end points is coupled to one first supply voltage, and a control end points is coupled to this second control signal;
One first resistance, have one first exit point that one first end points is coupled to this first transistor, and one second end points is coupled to this first supply voltage;
One the 3rd switch, has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first control signal;
One transistor seconds, has one second end points that a control point end is coupled to the 3rd switch;
One the 4th switch, have this control end points that one first end points is coupled to this transistor seconds, one second end points is coupled to one second supply voltage, and a control end points is coupled to this second control signal;
One second resistance, has one first exit point that one first end points is coupled to this transistor seconds; And
One the 5th switch, have one second end points that one first end points is coupled to this second resistance, one second end points is coupled to this second supply voltage, and a control end points is coupled to this first control signal;
Wherein one second exit point of this first transistor is coupled to one second exit point of this transistor seconds, and is coupled to this second end points of this crystal oscillator.
Two of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of oscillation signal production method.This oscillation signal production method is used for control one oscillating circuit, and this oscillating circuit includes: a crystal oscillator has one first end points and one second end points, is used for generation one oscillation signal; One resistive element has this first end points that one first end points is coupled to this crystal oscillator, and one second end points is coupled to this second end points of this crystal oscillator; And one starting of oscillation utensil have an input endpoint to be coupled to this first end points of this crystal oscillator, and an exit point is coupled to this second end points of this crystal oscillator.This oscillation signal production method includes: when this oscillating circuit is in an operating mode to produce an output oscillation signal, produces a control signal and switches to one to press down energy state from an enabled status this vibration generator; And carry out this output oscillation signal as this oscillating circuit according to this oscillation signal that this crystal oscillator produces.
Oscillation signal production method of the present invention, wherein this vibration generator operates between one first supply voltage and one second supply voltage, and produces this control signal and switch to this to press down from this enabled status this vibration generator step of state separately to include:
Be an open circuit (open-circuit) state by the path setting between this vibration generator and this first voltage quasi position or this second voltage quasi position.
Oscillation signal production method of the present invention, wherein this resistive element one transmits lock, and produces this control signal and switch to this to press down from this enabled status this vibration generator step of state separately to include:
When this vibration generator be in this press down can state time, this transmission lock is set as a not on-state; And
When this vibration generator is in this enabled status, this transmission lock is set as a conducting state.
Oscillation signal production method of the present invention, wherein when this oscillating circuit is in this operating mode and this vibration generator is in this enabled status, produces this control signal and switches to this step pressing down energy state to include from this enabled status this vibration generator:
Timing one scheduled time; And
After arriving in this scheduled time, this vibration generator switches to this to press down energy state from this enabled status by this control signal of setting.
Oscillation signal production method of the present invention, wherein when this oscillating circuit is in this operating mode and this vibration generator be in this press down can state time, separately include:
Timing one scheduled time; And
After arriving in this scheduled time, this vibration generator presses down state can switch to this enabled status from this by this control signal of setting.
Oscillation signal production method of the present invention, wherein produces this control signal and switches to this step pressing down energy state to include from this enabled status this vibration generator:
Count the periodicity of this output oscillation signal to produce a count results; And
When this oscillating circuit is in this operating mode and this vibration generator is in this enabled status, judge whether this count results reaches one first predetermined period number, when this count results reaches this first predetermined period number, produce this control signal and switch to this to press down the state of energy from the state of this activation this vibration generator.
Oscillation signal production method of the present invention, wherein when this oscillating circuit is in this operating mode and this vibration generator be in this press down can state time, produce this control signal and switch to this to press down from this enabled status this vibration generator step of state separately to include:
Judge whether this count results reaches one second predetermined period number, when this count results reaches this second predetermined period number, set this control signal and this vibration generator is pressed down state can switch to this enabled status from this.
Oscillation signal production method of the present invention, wherein produces this control signal and switches to this step pressing down energy state to include from this enabled status this vibration generator:
When this oscillating circuit is under this operating mode and this vibration generator is in this enabled status, detect a peak of this output oscillation signal to peak value; And
When this peak reaches one first critical peak to peak value to peak value, set this control signal and switch to this to press down energy state from this enabled status this vibration generator.
Oscillation signal production method of the present invention, wherein when this oscillating circuit is under this operating mode and this vibration generator be in this press down can state time, produce this control signal and switch to this to press down from this enabled status this vibration generator step of state separately to include:
When this peak reaches one second critical peak to peak value to peak value, set this control signal and this vibration generator is pressed down state can switch to this enabled status from this.
Oscillation signal production method of the present invention, wherein produces this control signal and switches to this step pressing down energy state to include from this enabled status this vibration generator:
The computing of signal frequency elimination is carried out to produce one first frequency elimination oscillation signal to this output oscillation signal;
The computing of signal frequency elimination is carried out to produce one second frequency elimination oscillation signal to this first frequency elimination oscillation signal; And
This control signal is set according to this first frequency elimination oscillation signal and this second frequency elimination oscillation signal.
Oscillation signal production method of the present invention, wherein when this oscillating circuit is in this operating mode and this vibration generator be in this press down can state time, separately include:
Detect this oscillation signal;
When detecting this oscillation signal and meeting a particular condition, then produce this control signal and this vibration generator is pressed down state can switch to this enabled status from this.
Oscillation signal production method of the present invention, wherein this particular condition is that the predetermined level of voltage conforms one of this oscillation signal or the periodicity of this oscillation signal are accumulate to a predetermined number.
Implement oscillation signal generation device of the present invention and its correlation technique, there is following beneficial effect: oscillating circuit cuts out with the power consumption saving oscillating circuit by oscillation signal generation device after oscillating circuit success starting of oscillation again, and utilize crystal oscillator to produce one resonance signal exports oscillation signal as it, again start oscillating circuit when the energy of this resonance signal that crystal oscillator produces is reduced to a predetermined extent, so reach the object reducing power consumption.Compared to traditional crystal oscillator, oscillation signal generation device of the present invention does not need method for designing through low transduction and low current to save electric current, and then makes the crystal oscillator of chip area yet than traditional occupied by oscillation signal generation device of the present invention little.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
One embodiment schematic diagram of a kind of oscillation signal generation device of Fig. 1 a the present invention;
The schematic diagram of another embodiment of Fig. 1 b oscillation signal generation device of the present invention;
Fig. 2 when the oscillating circuit in this oscillation signal generation device be in an operating mode and an inverter be in one press down can state time, a crystal oscillator produce one resonance signal a sequential chart;
One first embodiment schematic diagram of Fig. 3 the present invention one control circuit;
Fig. 4 when this inverter in this oscillation signal generation device in an enabled status and one press down can switch between state time, flow through a sequential chart of the electric current of a first transistor and a transistor seconds;
One second embodiment schematic diagram of Fig. 5 the present invention one control circuit;
One first frequency elimination oscillation signal, the one second frequency elimination oscillation signal, one first of this control circuit of Fig. 6 Fig. 5 control the sequential chart that signal and one second controls signal;
One embodiment flow chart of a kind of oscillation signal production method of Fig. 7 the present invention.
[primary clustering symbol description]
100 oscillation signal generation devices, 102 oscillating circuits, 104, 500 control circuits, 402, 404 curves, 502 first numerical digit frequency eliminators, 504 second numerical digit frequency eliminators, 506 logic locks, 1022 crystal oscillators, 1024 resistive elements, 1026 inverters, 1026a first switch, 1026b the first transistor, 1026c second switch, 1026d first resistance, 1026e the 3rd switch, 1026f transistor seconds, 1026g the 4th switch, 1026h second resistance, 1026i the 5th switch, 1028 amplifiers, 1028a the 6th switch, 1028b the 7th switch, 1028c the 8th switch, 1042 clock counters, 1044 decision circuitry, 5062 NOR gate, 5064 inverters.
Embodiment
Some vocabulary is employed to censure specific assembly in the middle of specification and follow-up claim.Person with usual knowledge in their respective areas should understand, and hardware manufacturer may call same assembly with different nouns.This specification and follow-up claim are not used as with the difference of title the mode distinguishing assembly, but are used as the criterion of differentiation with assembly difference functionally." comprising " mentioned in the middle of specification and follow-up claims is in the whole text an open term, therefore should be construed to " comprise but be not limited to ".In addition, " couple " word comprise directly any at this and be indirectly electrically connected means, therefore, if describe a first device in literary composition to be coupled to one second device, then represent this first device and directly can be electrically connected in this second device, or be indirectly electrically connected to this second device through other device or connection means.
Please refer to Fig. 1 a.According to an embodiment schematic diagram of a kind of oscillation signal generation device 100 of the present invention shown in Fig. 1 a.Oscillation signal generation device 100 includes oscillating circuit 102 and a control circuit 104.Oscillating circuit 102 includes: a crystal oscillator 1022, and it has one first end points N1 and one second end points N2, is used for generation one oscillation signal Sosc; One resistive element 1024, it has the first end points N1 that one first end points is coupled to crystal oscillator 1022, and one second end points is coupled to the second end points N2 of crystal oscillator 1022; And an inverter 1026, it has the first end points N1 that an input endpoint is coupled to crystal oscillator 1022, and an exit point is coupled to the second end points N2 of crystal oscillator 1022.Control circuit 104 is coupled to crystal oscillator 1022, be used for when oscillating circuit 102 is in an operating mode to produce an output oscillation signal Sout, producing control signal EN, an ENB switches to one to press down energy (disable) state from an activation (enable) state inverter 1026, and carrys out the output oscillation signal Sout as oscillating circuit 102 according to the oscillation signal Sosc that crystal oscillator 1022 produces.
Please note, the inverter 1026 of the present embodiment operates between a supply voltage Vdd and an earthed voltage Vgnd, when oscillating circuit 102 is activated, that is supply voltage Vdd and the equal normal ON of earthed voltage Vgnd are when the power end of inverter 1026 and earth terminal, inverter 1026 can form a regenerative circuit with resistive element 1024 and crystal oscillator 1022, wherein inverter 1026 is used to provide this feedback circuit one and transduces gain, and crystal oscillator 1022 can provide an enough phase delay, this loop is made to meet Barkhausen (Barkhausen) law.In another embodiment, inverter 1026 can be an amplifier.Then, when the oscillating circuit 102 that crystal oscillator 1022, resistive element 1024 and inverter 1026 are formed is set to meet so-called Barkhausen (Barkhausen) law, oscillating circuit 102 starting of oscillation will also produce output oscillation signal Sout, wherein export oscillation signal Sout to vibrate between supply voltage Vdd and earthed voltage Vgnd, and there is a specific frequency of oscillation, as 32kHz (frequency of oscillation is mainly determined according to the component characteristic of crystal oscillator 1022).And after oscillating circuit 102 has oscillation signal Sout, will store certain energy in crystal oscillator 1022, this is because the main body of crystal oscillator 1022 is made up of the dead resistance of the large inductance of an equivalence, the electric capacity of an equivalence and an equivalence.When the Q factor (that is Q value) of crystal oscillator 1022 is higher, the parasitic resistance values of its equivalence will be less, is stored in the energy that energy in crystal oscillator 1022 consumed by dead resistance just fewer.That is, when the mass parameter (that is Q value) of crystal oscillator 1022 is higher, do not having under external power supply supply, this covibration that crystal oscillator 1022 can maintain is more of a specified duration.Therefore, one of spirit of the present invention is exactly when oscillating circuit 102 is in this operating mode and produces output oscillation signal Sout, producing control signal EN, ENB switches to this to press down energy state from this enabled status inverter 102, and according to the next output oscillation signal Sout as oscillating circuit 102 of resonance signal (that is oscillation signal Sosc) that crystal oscillator 1022 produces.Just can save the electric current that inverter 102 consumes under this operating mode thus.
In order to further illustrate spiritual place of the present invention, also show an embodiment schematic diagram of inverter 1026 of the present invention in fig 1 a, but this embodiment is not as restriction place of the present invention.The inverter 1026 of the present embodiment includes one first switch 1026a, a first transistor 1026b, a second switch 1026c, one first resistance 1026d, one the 3rd switch 1026e, a transistor seconds 1026f, one the 4th switch 1026g, one second resistance 1026h and the 5th switch 1026i.First switch 1026a has the first end points N1 that one first end points is coupled to crystal oscillator 1022, and a control end points is coupled to one first control signal EN.The first transistor 1026b, has the one second end points N3 that a control point end N3 is coupled to the first switch 1026a.Second switch 1026c, there is the control end points N3 that one first end points is coupled to the first transistor 1026b, one second end points is coupled to one first supply voltage (that is an earthed voltage Vgnd), and a control end points is coupled to one second control signal ENB.First resistance 1026d has one first exit point (that is source terminal) that one first end points N4 is coupled to the first transistor 1026b, and one second end points is coupled to earthed voltage.3rd switch 1026e has the first end points N1 that one first end points is coupled to crystal oscillator 1022, and a control end points is coupled to the first control signal EN.Transistor seconds 1026f has one second end points that a control point end N5 is coupled to the 3rd switch 1026e.4th switch 1026g has the control end points N5 that one first end points is coupled to transistor seconds, and one second end points is coupled to one second supply voltage (that is a supply voltage Vdd), and a control end points is coupled to the second control signal ENB.Second resistance 1026h, has one first exit point (that is source terminal) that one first end points N6 is coupled to transistor seconds 1026f.5th switch 1026i has one second end points that one first end points N7 is coupled to the second resistance 1026h, and one second end points is coupled to supply voltage Vdd, and a control end points is coupled to the first control signal EN.In addition, one second exit point (that is the drain end) N8 of the first transistor 1026b is coupled to one second exit point (that is drain end) of transistor seconds 1026f, and is coupled to the second end points N2 of crystal oscillator.
Can learn from the inverter 1026 of Fig. 1 a, when oscillating circuit 102 is in this operating mode and inverter 1026 is in this enabled status, control circuit 104 produce first and control signal EN and will set to connect (switchon) the first switch 1026a, the 3rd switch 1026e and the 5th switch 1026i, and second controls signal ENB and will set to disconnect (switchoff) second switch 1026c and the 4th switch 1026g.Otherwise, when oscillating circuit 102 be in this operating mode and inverter 1026 be in this press down can state time, control circuit 104 produce first to control that signal EN will set to disconnect the first switch 1026a, the 3rd switch 1026e and the 5th switch 1026i to make the path between inverter 1026 and supply voltage Vdd be an open circuit (open-circuit) state, and second controls signal ENB and will set to connect second switch 1026c and the 4th switch 1026g.Please note, this field has knows that the 5th switch 1026i can also be arranged between this second end points and earthed voltage Vgnd of the first resistance 1026d by the knowledgeable usually, or the optional position be arranged on the series winding path of the first transistor 1026b, transistor seconds 1026f and supply voltage Vdd, earthed voltage Vgnd, it also belongs to category place of the present invention.Thus, when oscillating circuit 102 be in this operating mode and inverter 1026 be in this press down can state time, because between the supply voltage Vdd of inverter 1026 and earthed voltage Vgnd, path is off state, therefore now inverter 102 has any power consumption hardly.
In addition, in order to reduce the power consumption of oscillation signal generation device 100 further, in the present embodiment, resistive element 1,024 one transmits lock (Transmissiongate) and carrys out in addition implementation.When oscillating circuit 102 is in this operating mode and inverter 1026 is in this enabled status, control circuit 104 produce first to control that signal EN will be used for setting this transmission lock be a conducting state; And when oscillating circuit 102 be in this operating mode and inverter 1026 be in this press down can state time, control circuit 104 produce first control signal EN will be used for setting this transmission lock be a not on-state to reduce the electric current reducing and flow through resistive element 1024, the power consumption of minimizing oscillation signal generation device 100 further.
The schematic diagram of another embodiment of Fig. 1 b oscillation signal generation device 100 of the present invention, the assembly wherein with Fig. 1 a with identical numbering has same or similar function, is correlated with and is described in this omission.The maximum difference of Fig. 1 b and Fig. 1 a is that the inverter 1026 in Fig. 1 a is replaced into the amplifier 1028 in Fig. 1 b.Amplifier 1028 provides enough large enlargement ratio to oscillating circuit 102, meet primary Ioops gain (Loopgain) with the loop making amplifier 1028 be formed with resistive element 1024 under the operating state of normal power supply and be greater than 1 condition, and cause oscillating circuit 102 to be able to successfully starting of oscillation.Functionally, also the amplifier 1028 in Fig. 1 b and the inverter 1026 in Fig. 1 a can be considered as the vibration generator of oscillating circuit 102, therefore the amplifier 1028 in Fig. 1 b of the present invention can also be replaced with a vibration generator with the inverter 1026 in Fig. 1 a, and it also can reach similar effect.In other words, the different execution modes of the amplifier 1028 in Fig. 1 b and inverter 1026 vibration generator of the present invention in Fig. 1 a.Under some specified conditions (such as start oscillating circuit 102 time, oscillation signal Sout amplitude too small time or vibration generator exceed a period of time do not connect electricity time), control circuit 104 produces the first control signal EN to connect the 6th switch 1028a, the 7th switch 1028b, the 8th switch 1028c.And when oscillating circuit 102 starting of oscillation smoothly, when the amplitude of oscillation signal Sout has reached certain size, control circuit 104 produces the first control signal EN to disconnect the 6th switch 1028a, the 7th switch 1028b, the 8th switch 1028c.Now, amplifier 1028 consumes any energy hardly.
But, please refer to Fig. 2.Shown in Fig. 2 when oscillating circuit 102 is in this operating mode and inverter 1026 be in should but energy state time, a sequential chart of this resonance signal (that is oscillation signal Sosc) that crystal oscillator 1022 produces.Because crystal oscillator 1022 is not a perfect loss-free oscillator, therefore the energy be stored in crystal oscillator 1022 can reduce lentamente along with the time, that is the amplitude of oscillation signal Sosc (that is peak is to peak (peak-to-peak) value) can reduce lentamente along with the time.When the amplitude of oscillation signal Sosc is reduced to a predetermined critical amplitude or after starting of oscillation after one period of predetermined time, inverter 1026 can again press down state can be switched to this enabled status from this by control circuit 104, so that energy is again injected crystal oscillator 1022, that is utilize inverter 1026 to carry out starting of oscillation once again, now the amplitude of oscillation signal Sosc can become large along with the time again gradually, until its peak to peak close to till the pressure reduction between supply voltage Vdd and earthed voltage Vgnd.Please note, although the control circuit 104 shown in Fig. 1 a is used for receiving export oscillation signal Sout, but this field has knows that the knowledgeable should understand usually, when inverter 1026 was for pressing down energy state, the oscillation signal Sosc that crystal oscillator 1022 produces will export oscillation signal Sout.
Therefore, Fig. 3 of the present invention provides one first embodiment schematic diagram of control circuit 104, and wherein control circuit 104 includes clock counter 1042 and a decision circuitry 1044.Clock counter 1042 is used for exporting the periodicity of oscillation signal Sout to produce a count results N.Decision circuitry 1044 is coupled to clock counter 1042, it is used for when oscillating circuit 102 is in this operating mode and inverter 1026 is in this enabled status, judge whether count results N reaches one first predetermined period number, when count results N reaches this first predetermined period number, decision circuitry 1044 controls signal EN and second control signal ENB with regard to setting first and switches to this to press down the state of energy from the state of this activation inverter 1026.Note that, the first predetermined period number is minimum can be 1, that is, when oscillating circuit 102 create one can by the signal of the one-period of control circuit 104 identification time, can by inverter 1026 from the state of this activation switch to this press down can state.
When oscillating circuit 102 be in this operating mode and inverter 1026 be in this press down can state time, decision circuitry 1044 separately judges whether count results N reaches one second predetermined period number, when count results N reaches this second predetermined period number, then judge that the amplitude of oscillation signal Sosc has reached this predetermined critical amplitude, then decision circuitry 1044 just setting first control signal EN and second and control signal ENB inverter 1026 is pressed down state can switch to this enabled status from this.
Further, after oscillating circuit 102 is activated, clock counter 1042 will start action with the periodicity of the output oscillation signal Sout counting oscillation signal generation device 100 and produce, when count results N reaches this first predetermined period number, decision circuitry 1044 controls signal EN and second control signal ENB with regard to setting first and switches to this to press down the state of energy from the state of this activation inverter 1026.Then, clock counter 1042 will restart the periodicity of the oscillation signal Sosc (that is resonance signal) that counting crystal oscillator 1022 produces, when count results N reaches this second predetermined period number, inverter 1026 is switched to the state of this activation by decision circuitry 1044 from the state that this presses down energy with regard to setting first control signal EN and second control signal ENB, and repeat above-mentioned action again and again.Thus, after suitably designing, inverter 1022 most of the time is in the state pressing down energy, therefore its electric current consumed just can reduce significantly.
When inverter 1026 flows through a sequential chart of the electric current I (that is current sinking of oscillating circuit 102) of the first transistor 1026b and transistor seconds 1026f when this enabled status and this press down and switch between energy state shown in Fig. 4.Can learn from Fig. 4, when inverter 1026 is in this enabled status, the current sinking of oscillating circuit 102 is as shown in curve 402, one average current be greater than zero fluctuating current, and when inverter 1026 be in this press down can state time, it is zero that the current sinking of oscillating circuit 102 just falls, as shown in curve 404.Therefore, after oscillating circuit 102 is activated, if inverter 1026 be in this press down can state total time be in the total time of this enabled status much larger than inverter 1026 time, the average consumed cur-rent of oscillating circuit 102 will level off to zero.
On the other hand, in order to further reduce the power consumption of oscillation signal generation device 100, at control circuit 104 of the present invention with the mode of digital circuit implementation in addition, as shown in Figure 5.One second embodiment schematic diagram of Fig. 5 the present invention one control circuit 500, wherein control circuit 500 includes the digital frequency eliminator 504 of one first digital frequency eliminator 502,1 second and a logic lock 506.First numerical digit frequency eliminator 502 is coupled to the second end points N2 of crystal oscillator 1022, is used for carrying out the computing of signal frequency elimination, to produce one first frequency elimination oscillation signal Sd1 to output oscillation signal Sout.Second numerical digit frequency eliminator 504 is coupled to the first numerical digit frequency eliminator 502, is used for carrying out the computing of signal frequency elimination to produce one second frequency elimination oscillation signal Sd2 to the first frequency elimination oscillation signal Sd1.Logic lock 506 includes NOR gate 5062 and an inverter 5064, and it is coupled to the first numerical digit frequency eliminator 502 and the second digital frequency eliminator 504 and is used for setting the first control signal EN and second according to the first frequency elimination oscillation signal Sd1 and the second frequency elimination oscillation signal Sd2 and controls signal ENB.Please note, when oscillating circuit 102 is in this operating mode and inverter 1026 is in this enabled status, first digital frequency eliminator 502 carries out the computing of signal frequency elimination to produce the first frequency elimination oscillation signal Sd1 to output oscillation signal Sout, and when oscillating circuit 102 be in this operating mode and inverter 1026 be in this press down can state time, the first digital frequency eliminator 502 couples of oscillation signal Sosc carry out the computing of signal frequency elimination to produce the first frequency elimination oscillation signal Sd1.In addition, the first digital frequency eliminator 502 and the second digital frequency eliminator 504 can carry out implementation in addition with clock counter, and this field has knows that the knowledgeable should understand its circuit structure usually, therefore does not repeat them here.
Please note, in the present embodiment, first digital frequency eliminator 502 can to exporting oscillation signal Sout divided by one first particular divisor to produce the first frequency elimination oscillation signal Sd1, and the second digital frequency eliminator 504 can produce the second frequency elimination oscillation signal Sd2 to the first frequency elimination oscillation signal Sd1 divided by one second particular divisor (this second particular divisor of such as the present embodiment is two), as shown in Figure 6.First frequency elimination oscillation signal Sd1, the second frequency elimination oscillation signal Sd2, first of the control circuit 500 of Fig. 5 shown in Fig. 6 control the sequential chart that signal EN and second controls signal ENB.Frequency of oscillation due to the first frequency elimination oscillation signal Sd1 is the twice of the second frequency elimination oscillation signal Sd2, therefore every a very first time T1, first voltage quasi position controlling signal EN will switch to a high voltage level from a low voltage level, and the second voltage quasi position controlling signal ENB will switch to this low voltage level from this high voltage level, and the first control signal EN can continue one second time T2 in this high voltage level, second control signal ENB also can continue the second time T2 in low high voltage level simultaneously, wherein very first time T1 is a clock cycle of the second frequency elimination oscillation signal Sd2, and the second time T2 is half clock cycle of the first frequency elimination oscillation signal Sd1.Therefore, can learn from above description, via this second particular divisor of this first particular divisor and the second numerical digit frequency eliminator 504 of suitably setting the first digital frequency eliminator 502, the first start-up time controlling signal ENB start-up time and second controlling signal EN just can at random be set.Further, the present embodiment decides the time of the open and close of inverter 1026, to save the power consumption of inverter 1026 through this first particular divisor of the digital frequency eliminator 502 of setting first and this second particular divisor of the second numerical digit frequency eliminator 504.
Please note, above-mentioned control circuit 104 is control inverter 1026 intermittently to open and close with an object of the design of control circuit 500, to save the power consumption of inverter 1026, and the time point opening and closing inverter 1026 can according to designer's experience, and the open and close time that setting is fixed is (such as shown in Fig. 6, open half clock cycle in every two clock cycle and close a half clock cycle), to reduce the complexity of control circuit.In another embodiment, when inverter 1026 cuts out, whether the amplitude that oscillation signal Sosc detected by control circuit 104 decays to this predetermined critical amplitude, when the amplitude fading of oscillation signal Sosc is to this predetermined critical amplitude then activation inverter 1026; When inverter 1026 is opened, whether the amplitude that oscillation signal Sosc detected by control circuit 104 returns to a normal amplitude, if amplitude recovery is normal, then control circuit 104 just presses down energy inverter 1026, therefore in another embodiment of the invention, control circuit 104 also directly can utilize voltage detection circuit, and a such as peak carrys out implementation in addition to peak (peak-to-peak) circuit for detecting.In this embodiment, when oscillating circuit 102 is under this operating mode and inverter 1026 is in this enabled status, this peak exports a peak of oscillation signal Sout to peak value to the detecting of peak circuit for detecting, and when reaching one first critical peak to peak value in this peak to peak value, this peak controls signal ENB to peak circuit for detecting setting first control signal EN and second and switches to this to press down energy state from this enabled status inverter 1026.When oscillating circuit 102 to be under this operating mode and inverter 1026 be in this press down can state time, this peak to peak circuit for detecting separately in this peak to peak value reach (that is being reduced to) one second critical peak to peak value time, setting first control signal EN and second controls signal ENB to be pressed down by inverter 1026 state can switch to this enabled status from this, to make this peak return to (that is being increased to) this first critical peak to peak value to peak value, then repeat above-mentioned action again and again to save the power consumption of inverter 1026.
Letter speech, above-mentioned proposed oscillation signal production method can be reduced to the step shown in Fig. 7.According to an embodiment flow chart of a kind of oscillation signal production method 700 of the present invention shown in Fig. 7, and oscillation signal production method 700 is used for control one oscillating circuit, oscillating circuit 102 as shown in Figure 1a.For simplicity, the follow-up explanation about oscillation signal production method 700 also please refer to the oscillating circuit 102 shown in Fig. 1 a.If identical result can be reached substantially, do not need necessarily to carry out according to the sequence of steps in the flow process shown in Fig. 7, and the step shown in Fig. 7 not necessarily will be carried out continuously, that is other step also can be inserted wherein.Oscillation signal production method 700 includes the following step:
Step 702: start oscillation signal generation device 100 and export oscillation signal Sout to produce;
Step 704: detecting exports oscillation signal Sout;
Step 706: when detecting a certain particular condition, generation first control signal EN and second controls signal ENB and switches to this to press down energy state from this enabled status inverter 1026;
Step 708: detecting exports oscillation signal Sout;
Step 710: when detecting another particular condition, generation first control signal EN and second controls signal ENB to be pressed down by inverter 1026 state can switch to this enabled status from this, skips to step 704.
Please note, a certain particular condition of the present invention can be considered for one first scheduled time, and another particular condition can be considered for one second scheduled time, this first scheduled time and this second scheduled time also can replace by the parameter that other same concept maybe can have an identical result, and it also belongs to category place of the present invention.For example, step 704 can also detect the periodicity exporting oscillation signal Sout, and when this periodicity reach to should the count results of first scheduled time time, just in step 706 produce the first control signal EN and second control signal ENB switch to this to press down from this enabled status inverter 1026 can state.In like manner, step 708 can also detect the periodicity exporting oscillation signal Sout, and when this periodicity reach to should the count results of second scheduled time time, just produce the first control signal EN and second in step 710 and control signal ENB inverter 1026 is pressed down state can switch to this enabled status from this.In addition, step 704 can also detect a peak of output oscillation signal Sout to peak value, and when this peak reaches one first predetermined peak to peak value to peak value, just in step 706 produce the first control signal EN and second control signal ENB switch to this to press down from this enabled status inverter 1026 can state.In like manner, step 708 can also detect a peak of output oscillation signal Sout to peak value, and when this peak reaches one second predetermined peak to peak value to peak value, just in step 710 produce the first control signal EN and second control signal ENB by inverter 1026 from this press down can state switch to this enabled status.Then, when step 710 completes, rebound step 704 repeats same action again, just can drop to minimum by the power consumption of inverter 1026 thus, and then reduces the power consumption of whole oscillation signal generation device 100.
In sum, oscillating circuit 102 cuts out the power consumption saving oscillating circuit 102 again by oscillation signal generation device 100 of the present invention after the successful starting of oscillation of oscillating circuit 102, now and utilize crystal oscillator 1022 to produce one resonance signal exports oscillation signal Sout as it, again start oscillating circuit 102 when the energy of this resonance signal that crystal oscillator 1022 produces is reduced to a predetermined extent, so just can reach the object reducing power consumption.Therefore, compared to traditional crystal oscillator, oscillation signal generation device 100 of the present invention does not just need method for designing through low transduction and low current to save electric current, and then makes the crystal oscillator of chip area yet than traditional occupied by oscillation signal generation device 100 of the present invention little.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (22)
1. an oscillation signal generation device, is characterized in that, includes:
One oscillating circuit, includes:
One crystal oscillator, has one first end points and one second end points, is used for generation one oscillation signal;
One resistive element, have this first end points that one first end points is coupled to this crystal oscillator, and one second end points is coupled to this second end points of this crystal oscillator; And
One vibration generator, have this first end points that an input endpoint is coupled to this crystal oscillator, and an exit point is coupled to this second end points of this crystal oscillator; And
One control circuit, be coupled to this crystal oscillator, be used for when this oscillating circuit is in an operating mode to produce an output oscillation signal, producing a control signal switches to one to press down energy state from an enabled status this vibration generator, and carrys out this output oscillation signal as this oscillating circuit according to this oscillation signal that this crystal oscillator produces;
Wherein this control signal includes one first control signal and one second control signal, and this vibration generator includes:
One first switch, has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first control signal;
One the first transistor, has one second end points that a control end points is coupled to this first switch;
One second switch, have this control end points that one first end points is coupled to this first transistor, one second end points is coupled to one first supply voltage, and a control end points is coupled to this second control signal;
One first resistance, have one first exit point that one first end points is coupled to this first transistor, and one second end points is coupled to this first supply voltage;
One the 3rd switch, has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first control signal;
One transistor seconds, has one second end points that a control end points is coupled to the 3rd switch;
One the 4th switch, have this control end points that one first end points is coupled to this transistor seconds, one second end points is coupled to one second supply voltage, and a control end points is coupled to this second control signal;
One second resistance, has one first exit point that one first end points is coupled to this transistor seconds; And
One the 5th switch, have one second end points that one first end points is coupled to this second resistance, one second end points is coupled to this second supply voltage, and a control end points is coupled to this first control signal;
Wherein one second exit point of this first transistor is coupled to one second exit point of this transistor seconds, and is coupled to this second end points of this crystal oscillator.
2. oscillation signal generation device according to claim 1, it is characterized in that, wherein this vibration generator operates between one first supply voltage and one second supply voltage, and when this vibration generator be in this press down can state time, be in an off state between this vibration generator and this first supply voltage or this second supply voltage.
3. oscillation signal generation device according to claim 1, is characterized in that, wherein this resistive element one transmits lock, when this vibration generator be in this press down can state time, this transmission lock is in a not on-state, and when this vibration generator is in this enabled status, this transmission lock is in a conducting state.
4. oscillation signal generation device according to claim 3, is characterized in that, wherein this transmission lock is controlled by this control circuit.
5. oscillation signal generation device according to claim 1, it is characterized in that, wherein when this oscillating circuit is in this operating mode and this vibration generator is in this enabled status, this control circuit timing one scheduled time, and after arriving in this scheduled time, this vibration generator switches to this to press down energy state from this enabled status by this control signal of setting.
6. oscillation signal generation device according to claim 1, it is characterized in that, wherein when this oscillating circuit is in this operating mode and this vibration generator be in this press down can state time, this control circuit another timing one scheduled time, and after arriving in this scheduled time, this vibration generator presses down state can switch to this enabled status from this by this control signal of setting.
7. oscillation signal generation device according to claim 1, is characterized in that, wherein this control circuit includes:
One clock counter, is used for counting the periodicity of this output oscillation signal to produce a count results; And
One decision circuitry, be coupled to this clock counter, be used for when this oscillating circuit is in this operating mode and this vibration generator is in this enabled status, judge whether this count results reaches one first predetermined period number, when this count results reaches this first predetermined period number, this decision circuitry produces this control signal and switches to this to press down the state of energy from the state of this activation this vibration generator.
8. oscillation signal generation device according to claim 7, it is characterized in that, wherein this decision circuitry separately in this oscillating circuit be in this operating mode and this vibration generator be in this press down can state time, judge whether this count results reaches one second predetermined period number, when this count results reaches this second predetermined period number, this decision circuitry separately sets this control signal and is pressed down state can switch to this enabled status from this by this vibration generator.
9. oscillation signal generation device according to claim 1, is characterized in that, wherein this control circuit includes:
One peak is to peak circuit for detecting, when this oscillating circuit is under this operating mode and this vibration generator is in this enabled status, a peak of this output oscillation signal is detected to peak value to peak circuit for detecting in this peak, and when reaching one first critical peak to peak value in this peak to peak value, this peak sets this control signal to peak circuit for detecting and switches to this to press down energy state from this enabled status this vibration generator.
10. oscillation signal generation device according to claim 9, it is characterized in that, wherein when this oscillating circuit is under this operating mode and this vibration generator be in this press down can state time, when this peak separately reaches one second critical peak to peak value in this peak to peak value to peak circuit for detecting, set this control signal and this vibration generator is pressed down state can switch to this enabled status from this.
11. oscillation signal generation devices according to claim 1, it is characterized in that, wherein this control circuit includes:
One first numerical digit frequency eliminator, is coupled to this crystal oscillator, is used for carrying out the computing of signal frequency elimination to this output oscillation signal, to produce one first frequency elimination oscillation signal;
One second numerical digit frequency eliminator, is coupled to this first numerical digit frequency eliminator, is used for carrying out the computing of signal frequency elimination to this first frequency elimination oscillation signal, to produce one second frequency elimination oscillation signal; And
One logic lock, is coupled to this first digital frequency eliminator and this second digital frequency eliminator, is used for according to this first frequency elimination oscillation signal and this second frequency elimination oscillation signal to set this control signal.
12. 1 kinds of oscillation signal production methods, are used for control one oscillating circuit, and this oscillating circuit includes:
One crystal oscillator, has one first end points and one second end points, is used for generation one oscillation signal;
One resistive element, have this first end points that one first end points is coupled to this crystal oscillator, and one second end points is coupled to this second end points of this crystal oscillator; And
One vibration generator, have this first end points that an input endpoint is coupled to this crystal oscillator, and an exit point is coupled to this second end points of this crystal oscillator;
It is characterized in that, this oscillation signal production method includes:
When this oscillating circuit is in an operating mode to produce an output oscillation signal, produce a control signal and switch to one to press down energy state from an enabled status this vibration generator; And
When this vibration generator be in this press down can state time, this oscillation signal produced according to this crystal oscillator comes as this output oscillation signal of this oscillating circuit;
Wherein this control signal includes one first control signal and one second control signal, and this vibration generator includes:
One first switch, has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first control signal;
One the first transistor, has one second end points that a control end points is coupled to this first switch;
One second switch, have this control end points that one first end points is coupled to this first transistor, one second end points is coupled to one first supply voltage, and a control end points is coupled to this second control signal;
One first resistance, have one first exit point that one first end points is coupled to this first transistor, and one second end points is coupled to this first supply voltage;
One the 3rd switch, has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first control signal;
One transistor seconds, has one second end points that a control end points is coupled to the 3rd switch;
One the 4th switch, have this control end points that one first end points is coupled to this transistor seconds, one second end points is coupled to one second supply voltage, and a control end points is coupled to this second control signal;
One second resistance, has one first exit point that one first end points is coupled to this transistor seconds; And
One the 5th switch, have one second end points that one first end points is coupled to this second resistance, one second end points is coupled to this second supply voltage, and a control end points is coupled to this first control signal;
Wherein one second exit point of this first transistor is coupled to one second exit point of this transistor seconds, and is coupled to this second end points of this crystal oscillator.
13. oscillation signal production methods according to claim 12, it is characterized in that, wherein this vibration generator operates between one first supply voltage and one second supply voltage, and produces this control signal and switch to this to press down from this enabled status this vibration generator step of state separately to include:
Be an off state by the path setting between this vibration generator and this first supply voltage or this second supply voltage.
14. oscillation signal production methods according to claim 12, is characterized in that, wherein this resistive element one transmits lock, and produce this control signal and switch to this to press down from this enabled status this vibration generator step of state separately to include:
When this vibration generator be in this press down can state time, this transmission lock is set as a not on-state; And
When this vibration generator is in this enabled status, this transmission lock is set as a conducting state.
15. oscillation signal production methods according to claim 12, it is characterized in that, wherein when this oscillating circuit is in this operating mode and this vibration generator is in this enabled status, produce this control signal and switch to this step pressing down energy state to include from this enabled status this vibration generator:
Timing one scheduled time; And
After arriving in this scheduled time, this vibration generator switches to this to press down energy state from this enabled status by this control signal of setting.
16. oscillation signal production methods according to claim 12, is characterized in that, wherein when this oscillating circuit is in this operating mode and this vibration generator be in this press down can state time, separately include:
Timing one scheduled time; And
After arriving in this scheduled time, this vibration generator presses down state can switch to this enabled status from this by this control signal of setting.
17. oscillation signal production methods according to claim 12, is characterized in that, wherein produce this control signal and switch to this step pressing down energy state to include from this enabled status this vibration generator:
Count the periodicity of this output oscillation signal to produce a count results; And
When this oscillating circuit is in this operating mode and this vibration generator is in this enabled status, judge whether this count results reaches one first predetermined period number, when this count results reaches this first predetermined period number, produce this control signal and switch to this to press down the state of energy from the state of this activation this vibration generator.
18. oscillation signal production methods according to claim 17, it is characterized in that, wherein when this oscillating circuit is in this operating mode and this vibration generator be in this press down can state time, produce this control signal by this vibration generator from this press down can state switch to the step of this enabled status separately to include:
Judge whether this count results reaches one second predetermined period number, when this count results reaches this second predetermined period number, set this control signal and this vibration generator is pressed down state can switch to this enabled status from this.
19. oscillation signal production methods according to claim 12, is characterized in that, wherein produce this control signal and switch to this step pressing down energy state to include from this enabled status this vibration generator:
When this oscillating circuit is under this operating mode and this vibration generator is in this enabled status, detect a peak of this output oscillation signal to peak value; And
When this peak reaches one first critical peak to peak value to peak value, set this control signal and switch to this to press down energy state from this enabled status this vibration generator.
20. oscillation signal production methods according to claim 19, it is characterized in that, wherein when this oscillating circuit is under this operating mode and this vibration generator be in this press down can state time, produce this control signal and this vibration generator pressed down can state switch to the step of this enabled status separately to include from this:
When this peak reaches one second critical peak to peak value to peak value, set this control signal and this vibration generator is pressed down state can switch to this enabled status from this.
21. oscillation signal production methods according to claim 12, is characterized in that, wherein produce this control signal and switch to this step pressing down energy state to include from this enabled status this vibration generator:
The computing of signal frequency elimination is carried out to produce one first frequency elimination oscillation signal to this output oscillation signal;
The computing of signal frequency elimination is carried out to produce one second frequency elimination oscillation signal to this first frequency elimination oscillation signal; And
This control signal is set according to this first frequency elimination oscillation signal and this second frequency elimination oscillation signal.
22. oscillation signal production methods according to claim 12, is characterized in that, wherein when this oscillating circuit is in this operating mode and this vibration generator be in this press down can state time, separately include:
Detect this oscillation signal;
When detecting this oscillation signal and meeting a particular condition, then produce this control signal and this vibration generator is pressed down state can switch to this enabled status from this;
Wherein this particular condition is that the predetermined level of voltage conforms one of this oscillation signal or the periodicity of this oscillation signal are accumulate to a predetermined number.
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| JPS5377454A (en) * | 1976-12-21 | 1978-07-08 | Seiko Instr & Electronics Ltd | Oscillator circuit |
| US4282496A (en) * | 1979-08-29 | 1981-08-04 | Rca Corporation | Starting circuit for low power oscillator circuit |
| JPH08204450A (en) * | 1995-01-30 | 1996-08-09 | Nec Corp | Semiconductor integrated circuit |
| JP3358379B2 (en) * | 1995-04-19 | 2002-12-16 | 株式会社大真空 | CMOS piezoelectric oscillation circuit |
| CN1180262A (en) * | 1996-09-05 | 1998-04-29 | 合泰半导体股份有限公司 | Integrated oscillating circuit |
| US6046648A (en) * | 1996-12-27 | 2000-04-04 | Seiko Epson Corporation | Crystal oscillator circuit having low power consumption |
| US7123109B2 (en) * | 2004-12-15 | 2006-10-17 | Intel Corporation | Crystal oscillator with variable bias generator and variable loop filter |
| CN101188420A (en) * | 2006-11-16 | 2008-05-28 | 普诚科技股份有限公司 | Loop system for automatically correcting surge frequency range and its related method |
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