CN103825555A - Oscillating circuit - Google Patents
Oscillating circuit Download PDFInfo
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- CN103825555A CN103825555A CN201410088038.9A CN201410088038A CN103825555A CN 103825555 A CN103825555 A CN 103825555A CN 201410088038 A CN201410088038 A CN 201410088038A CN 103825555 A CN103825555 A CN 103825555A
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Abstract
The invention relates to an oscillating circuit, comprising a charge unit, a discharge unit, a reference unit and a comparing unit, wherein the comparing unit comprises a positive end, a negative end, and an output end for outputting a comparison signal; the charge unit is applicable to charging the positive end to a first level when the comparison signal is the first signal; the charge unit is applicable to discharging the positive end to a second level when the comparison signal is the second signal; the reference unit is applicable to outputting first reference voltage to the negative end when the comparison signal is the first signal, and outputting second reference voltage to the negative end when the comparison signal is the second signal; the level values of the first level, the first reference level, the second reference level and the second level are orderly reduced progressively. By adopting the oscillating circuit, energy consumption of the oscillating circuit can be reduced.
Description
Technical field
The present invention relates to technical field of integrated circuits, particularly a kind of oscillating circuit.
Background technology
In large-scale digital ic, clock signal has become requisite part.The oscillator signal that clock signal can be exported by oscillating circuit produces, and in these digital system circuit, conventional oscillating circuit has three kinds: annular oscillation circuit, crystal oscillating circuit and RC (resistance-capacitance) oscillating circuit.
The hunting range of annular oscillation circuit is very wide, stability is higher, but annular oscillation circuit is very sensitive to the noise of power supply, layout dimension area is larger.Crystal oscillating circuit frequency is very accurate, and working stability, and its precision is only relevant with selected quartz crystal device natural frequency, but the power consumption of crystal oscillating circuit is very large, price is high, can not be integrated in the inside of chip.RC oscillating circuit because it is simple in structure, cost is compared with low and be easy to the advantage such as integrated and be widely used in integrated circuit.
The oscillating circuit of a kind of prior art as shown in Figure 1, comprising: charge/discharge unit 100, the first comparing unit 101, the second comparing unit 102, latch units 103 and output unit 104.
Continue with reference to figure 1, charge/discharge unit 100 comprises charging current source I1, discharging current heavy I1 ', charging control switch S1, discharge control switch S2, level output end CAP and capacity cell C.
The first comparing unit 101 comprises the first anode, the first negative terminal and the first output, the second comparing unit 102 comprises the second anode, the second negative terminal and the second output, level output end CAP is connected to respectively described the first anode and the second negative terminal, described the first negative terminal is connected to the first reference voltage V A, and described the second anode is connected to the second reference voltage V B.
Continue with reference to figure 1, the direct outputting oscillation signal of output signal that output unit 104 can be held based on Q, also can carry out Shape correction to the output signal of Q end, then outputting oscillation signal.The output of output unit 104 is the output of described Fig. 1 oscillating circuit.
In the oscillating circuit shown in Fig. 1, the first reference voltage V A and the second reference voltage V B can provide by following structure: oscillating circuit also comprises current source I2, the first resistance R 1 and the second resistance R 2, described current source I2, the first resistance R 1 and the second resistance R 2 are connected successively, wherein, one end of the first resistance R 1 is connected to described the first negative terminal, and the other end is connected to described the second anode.
Can obtain VA=I2* (R1+R2), VB=I2*R2 based on said structure.
The output signal direct outputting oscillation signal Vout of definition output unit 104 based on Q end, in conjunction with the waveform analysis figure of Fig. 2, the operation principle of oscillating circuit shown in Fig. 1 is:
As the level V of level output end CAP output
cAPhave: V
cAPrise and V
cAPwhen <VA, oscillator signal Vout is low level 0, now, charging control switch S1 closure, discharge control switch S2 disconnects, and charging current source I1 is to capacity cell C charging, the level V that level output end CAP exports
cAPlevel value raise, until V
cAP>VA.
As the level V of level output end CAP output
cAPhave: V
cAP>VA, oscillator signal Vout is high level 1, now, charging control switch S1 disconnects, discharge control switch S2 closure, discharging current sinks I1 ' to capacity cell C electric discharge, the level V that level output end 13 is exported
cAPlevel value reduce, until V
cAP<VB, oscillator signal Vout is low level 0.
In order effectively to suppress PVT (the Process Voltage Temperature) impact of deviation on circuit oscillation frequency, the oscillating circuit of prior art at least needs two comparing units, and comparing unit can consume a large amount of energy consumptions, to reach higher comparison speed.Thereby the energy consumption of the oscillating circuit of prior art is higher.
Summary of the invention
The technical problem that technical solution of the present invention solves is: the energy consumption that how to reduce oscillating circuit.
In order to solve the problems of the technologies described above, technical solution of the present invention provides a kind of oscillating circuit, is suitable for outputting oscillation signal, comprising: charhing unit, discharge cell, reference cell and comparing unit;
Described comparing unit comprises the output of anode, negative terminal and output comparison signal;
Described charhing unit is suitable for, in the time that described comparison signal is first signal, described anode is charged to the first level;
Described discharge cell is suitable for, in the time that described comparison signal is secondary signal, described anode is discharged to second electrical level;
Described reference cell is suitable for exporting the first reference level in the time that described comparison signal is first signal to described negative terminal, in the time that described comparison signal is secondary signal, export the second reference level to described negative terminal, the level value of described the first level, the first reference level, the second reference level and second electrical level successively decreases successively.
Optionally, described oscillating circuit also comprises: shaping unit;
Described shaping unit is suitable for described comparison signal to carry out shaping to export described oscillator signal.
Optionally, described charhing unit comprises: first input end, the first output, the first control device and capacitor element;
Described first input end is connected to the first electric current, and described the first output is connected to described anode;
One end of described the first control device is connected to described first input end, the other end is connected to described the first output, and its control end is connected to the 3rd signal, and the vibration trend of described the 3rd signal is contrary with described comparison signal;
One end of described capacitor element is connected to described the first output, and the other end is connected to ground.
Optionally, described charhing unit also comprises; Inverter; The input of described inverter is connected to the output of described comparing unit, and the output of described inverter is connected to the control end of described the first control device.
Optionally, described the first control device is the first nmos pass transistor; The drain electrode of described the first nmos pass transistor is connected to described first input end, and source electrode is connected to described the first output, and grid is connected to the output of described inverter.
Optionally, described oscillating circuit also comprises: current source;
Described current source is suitable for providing described the first electric current.
Optionally, described discharge cell comprises: the second input, the second output, second controller part and electric current are heavy;
Described the second input is connected to described anode, and described the second output is connected to ground;
One end of described second controller part is connected to described the second input, the other end is connected to the input that described electric current is heavy, and its control end is connected to the 4th signal, and the vibration trend of described the 4th signal is identical with described comparison signal;
The output that described electric current is heavy is connected to described the second output.
Optionally, described second controller part is the second nmos pass transistor; The drain electrode of described the second nmos pass transistor is connected to described the second input, and source electrode is connected to the input that described electric current is heavy, and grid is connected to the output of described comparing unit.
Optionally, described reference cell comprises: the 3rd input, the 3rd output, the 3rd control device, the first resistance device and the second resistance device;
Described the 3rd input is connected to respectively the 3rd electric current and described negative terminal;
One end of described the 3rd control device is connected to described the 3rd output, the other end is connected to described negative terminal, and its control end is connected to the 5th signal, and the vibration trend of described the 5th signal is identical with described comparison signal;
One end of described the first resistance device is connected to described the 3rd input, the other end is connected to described the 3rd output, and one end of described the second resistance device is connected to described the 3rd output, the other end is connected to ground.
Optionally, described the 3rd control device is the 3rd nmos pass transistor; The drain electrode of described the 3rd nmos pass transistor is connected to described negative terminal, and source electrode is connected to described the 3rd output, and grid is connected to the output of described comparing unit.
The beneficial effect of technical solution of the present invention is at least:
The oscillating circuit of technical solution of the present invention only uses a comparing unit can obtain output good frequency of oscillation and oscillator signal, and the benchmark of having set up reference cell changes the feedback relationship between the comparison signal of comparing unit, the time that discharges and recharges that changes to control charhing unit and put unit by controlling benchmark, thereby simplification circuit, has reduced the control power consumption of circuit.Compared with the oscillating circuit of prior art, the oscillating circuit of technical solution of the present invention only needs to consume the power consumption of a comparing unit, and can obtain good waveform without latch units, greatly reduces circuit energy consumption.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of oscillating circuit of prior art;
Fig. 2 is the waveform analysis figure of prior art oscillating circuit;
The structural representation of a kind of oscillating circuit that Fig. 3 provides for technical solution of the present invention;
Fig. 4 is the waveform analysis figure of technical solution of the present invention oscillating circuit;
The structural representation of the another kind of oscillating circuit that Fig. 5 provides for technical solution of the present invention.
Embodiment
For object of the present invention, feature and effect can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
Set forth in the following description a lot of details so that fully understand the present invention, implemented but the present invention can also adopt other to be different from mode described here, therefore the present invention is not subject to the restriction of following public specific embodiment.
A kind of oscillating circuit as shown in Figure 3, is suitable for outputting oscillation signal Fout, comprising:
Wherein:
Charhing unit 200 and discharge cell 201 can be integrated in same charging-discharging structure, and it possesses the node of discharging and recharging CAP0.
Comparing unit 203 comprises anode, negative terminal and output, described in described anode is connected to, discharges and recharges node CAP0, and described output is suitable for exporting comparison signal P.
Oscillating circuit is as shown in Figure 3 set up feedback network in the following way:
In the time that comparison signal P is first signal, charhing unit 200 is suitable for the described node CAP0 that discharges and recharges to charge, and in the time that the anode of described comparing unit 203 reaches the first level, comparison signal P is secondary signal by first signal saltus step;
In the time that comparison signal P is secondary signal, discharge cell 201 is suitable for the described node CAP0 that discharges and recharges to discharge, and in the time that the anode of described comparing unit 203 drops to second electrical level, comparison signal P is first signal by secondary signal saltus step.
In the time that comparison signal P is first signal, described reference cell is suitable for exporting the first reference level Va to described negative terminal, exports the second reference level Vb to described negative terminal in the time that described comparison signal P is secondary signal.
If first signal is low level signal, secondary signal is high level signal, from the waveform analysis figure shown in Fig. 4, can further understand the FEEDBACK CONTROL relation of oscillating circuit shown in Fig. 3:
In the time that comparison signal P is first signal: described in discharge and recharge that node CAP0 is charged by charhing unit 200 and described anode level rises gradually, described negative terminal level is the first reference level Va; In the time that anode level is the first level, the first level is greater than described the first reference level, and comparison signal P upset is secondary signal;
In the time that comparison signal P is secondary signal: described in discharge and recharge node CAP0 and be discharged that unit 201 discharges and described anode level declines gradually, described negative terminal level is the second reference level Vb; In the time that anode level is second electrical level, second electrical level is less than described the second reference level, and comparison signal P upset is first signal.
Based on above-mentioned analysis, the level value of described the first level, the first reference level Va, the second reference level Vb and second electrical level successively decreases successively.
Based on above-mentioned oscillating circuit, the application gives more specifically execution mode.
Fig. 5 has illustrated another kind of oscillating circuit, comprise: charge/discharge unit 300, reference cell 301, comparing unit 302 and output unit 303, comparing unit 302 comprises anode, negative terminal and output, described output is suitable for exporting comparison signal q, and the oscillator signal fout of oscillating circuit is based on described comparison signal q.
Described charge/discharge unit 300 is made up of charging subelement and electric discharge subelement.Wherein,
Described charging subelement comprises: current source i1, the first control device K1 and capacitor element C0; Described current source i1 charges to described capacitor element C0 in the time of the first control device K1 conducting, and at node CAP1 accumulation level; One end of capacitor element C0 is connected to described node CAP1, and the other end is connected to ground, and node CAP1 is connected to described anode.
Described electric discharge subelement comprises: the heavy i2 of electric current and second controller part K2; The heavy i2 of described electric current discharges to described capacitor element C0 in the time of second controller part K2 conducting, and at the node CAP1 level of releasing.
More specifically structure is, one end of described the first control device K1 is connected to described current source i1, the other end is connected to described node CAP1, and its control end is connected to the 3rd signal, and the vibration trend of described the 3rd signal is contrary with described comparison signal q.
One end of described second controller part K2 is connected to described node CAP1, the other end and is connected to the input of the heavy i2 of described electric current, and second controller part K2 control end is connected to the 4th signal, and the vibration trend of described the 4th signal is identical with described comparison signal q; The output of the heavy i2 of described electric current is connected to ground.
Described the 3rd signal and the 4th signal form based on described comparison signal q, form thus the feedback network based on described comparison signal q.Described comparison signal q directly can be fed back, be undertaken as described the 3rd signal by the anti-phase of described comparison signal q, using described comparison signal q as described the 4th signal.
For charge/discharge unit 300, for realizing the anti-phase of comparison signal q, to form the feedback network of comparison signal q, continue with reference to figure 5, described oscillating circuit can also comprise an inverter 304, the input of inverter 304 is connected to the output of described comparing unit 302 to receive described comparison signal q, and the output of described inverter 304 is connected to the control end of described the first control device K1.And the output of described comparing unit 302 is connected to the control end of described second controller part K2, to realize feedback.
Be not limited to the mode of above-mentioned direct feedback, can also feed back the signal relevant to comparison signal q, such as described oscillator signal fout, or signal q forms the M signal (described M signal is the varying level signal of exporting identical cycle of oscillation based on described comparison signal q) of described oscillator signal fout based on the comparison, all can be used as described feedback signal.
In addition, in the application, the above-mentioned control device adaptability all secondary closures in ground or shutoff, charge and discharge process that can control capacitance device C0.As shown in Figure 5, described the first control device K1 can realize by the first nmos pass transistor, and the drain electrode of described the first nmos pass transistor is connected to described current source i1, and source electrode is connected to described node CAP1, and grid is connected to the output of described inverter 304.Described second controller part K2 can realize by the second nmos pass transistor; The drain electrode of described the second nmos pass transistor is connected to described node CAP1, and source electrode is connected to the heavy i2 of described electric current, and grid is connected to the output of described comparing unit 302.
In this application, described reference cell 301 also possesses feedback relationship with the comparison signal q that described comparing unit 302 is exported.
Reference cell 301 comprises: current source i3, the 3rd control device K3, the first resistance device r1 and the second resistance device r2.Current source i3, the first resistance device r1 and the second resistance device r2 are series between supply voltage VDD and ground, one end of described the first resistance device r1 is connected to the negative terminal of comparing unit 302, the other end connects the second resistance device r2, and described the 3rd control device K3 is parallel to described the first resistance device r1 two ends.The control end of described the 3rd control device K3 is connected to the 5th signal, and the vibration trend of described the 5th signal is identical with described comparison signal q.
In the time that comparison signal q is first signal, described reference cell 301 is suitable for exporting the first reference level Va to described negative terminal, exports the second reference level Vb to described negative terminal in the time that described comparison signal q is secondary signal.According to the structure of Fig. 5, can obtain: Va=i3* (r1+r2), Vb=i3*r2, has Va>Vb.
The 3rd control device K3 can be realized by the 3rd nmos pass transistor equally, the drain electrode of described the 3rd nmos pass transistor and source electrode are as the two ends of described control device K3, the two ends that are parallel to the first resistance device r1 (also can be thought, the drain electrode of the 3rd nmos pass transistor is connected to described negative terminal, source electrode is connected to described the second resistance device r2), grid as the control end of the 3rd control device K3, be connected to the output of described comparing unit 302.
In this application, the varying level of exporting by comparison signal q, produce the 3rd signal, the 4th signal and the 5th signal, feedback output circuit oscillatory regime now, and control respectively the operating state of charge/discharge unit and reference cell based on described the 3rd signal, the 4th signal and the 5th signal, make the application's oscillating circuit possess good cycle of oscillation.
It should be noted that, the output current of the heavy i2 of current source i1 and electric current can be designed to same electrical flow valuve, and this can guarantee the isotropism of the time that discharges and recharges, further makes circuit have good cycle of oscillation.Described in the application, current source i1, the heavy i2 of electric current and current source i3 can be also that external equipment provides.
In conjunction with the waveform analysis figure of Fig. 4, the operation principle of oscillating circuit shown in Fig. 5 is:
In the time that comparison signal q is first signal, the first control device K1 closure, second controller part K2 disconnects, the 3rd control device K3 disconnects, now, charge/discharge unit 300 charges to capacitor element C0, node CAP1 output level is to anode, when anode electrical level rising and anode level are less than the first reference level Va, comparison signal q is continuously first signal (low level), and oscillator signal fout is low level 0, and charge/discharge unit 300 continues capacitor element C0 to charge, until anode electrical level rising to the first level, the first level is greater than the first reference level Va.
When anode electrical level rising to the first level and while being greater than the first reference level Va, comparison signal q becomes secondary signal (high level), and oscillator signal fout also overturns as high level 1.Now, the first control device K1 disconnects, second controller part K2 closure, the 3rd control device K3 closure, now, charge/discharge unit 300 is to capacitor element C0 electric discharge, and anode level reduces and anode level is less than the first reference level Va, comparison signal q is continuously secondary signal (high level), and oscillator signal fout is high level 1.Charge/discharge unit 300 continues the electric discharge to capacitor element C0, until anode level drops to second electrical level, second electrical level is less than the second reference level Vb.In the time that anode level drops to second electrical level and be less than the second reference level Vb, comparison signal q becomes first signal (low level), and oscillator signal fout also overturns as low level 0.
Known based on above-mentioned analysis, in above-mentioned oscillating circuit, the vibration trend of oscillator signal fout and comparison signal q is consistent.In other embodiments, described oscillating circuit can also comprise the shaping unit between comparing unit 302 outputs and output unit 303 inputs, described shaping unit is suitable for described comparison signal q to carry out shaping to export described oscillator signal fout, described oscillator signal fout can be contrary with the vibration trend of described comparison signal q, and the amplitude of oscillator signal fout also can obtain by the amplitude based on described comparison signal q.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible variation and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection range of technical solution of the present invention.
Claims (10)
1. an oscillating circuit, is suitable for outputting oscillation signal, it is characterized in that, comprising: charhing unit, discharge cell, reference cell and comparing unit;
Described comparing unit comprises the output of anode, negative terminal and output comparison signal;
Described charhing unit is suitable for, in the time that described comparison signal is first signal, described anode is charged to the first level;
Described discharge cell is suitable for, in the time that described comparison signal is secondary signal, described anode is discharged to second electrical level;
Described reference cell is suitable for exporting the first reference level in the time that described comparison signal is first signal to described negative terminal, in the time that described comparison signal is secondary signal, export the second reference level to described negative terminal, the level value of described the first level, the first reference level, the second reference level and second electrical level successively decreases successively.
2. oscillating circuit as claimed in claim 1, is characterized in that, also comprises: shaping unit;
Described shaping unit is suitable for described comparison signal to carry out shaping to export described oscillator signal.
3. oscillating circuit as claimed in claim 1, is characterized in that, described charhing unit comprises: first input end, the first output, the first control device and capacitor element;
Described first input end is connected to the first electric current, and described the first output is connected to described anode;
One end of described the first control device is connected to described first input end, the other end is connected to described the first output, and its control end is connected to the 3rd signal, and the vibration trend of described the 3rd signal is contrary with described comparison signal;
One end of described capacitor element is connected to described the first output, and the other end is connected to ground.
4. oscillating circuit as claimed in claim 3, is characterized in that, described charhing unit also comprises: inverter; The input of described inverter is connected to the output of described comparing unit, and the output of described inverter is connected to the control end of described the first control device.
5. oscillating circuit as claimed in claim 4, is characterized in that, described the first control device is the first nmos pass transistor; The drain electrode of described the first nmos pass transistor is connected to described first input end, and source electrode is connected to described the first output, and grid is connected to the output of described inverter.
6. oscillating circuit as claimed in claim 3, is characterized in that, also comprises: current source;
Described current source is suitable for providing described the first electric current.
7. oscillating circuit as claimed in claim 1, is characterized in that, described discharge cell comprises: the second input, the second output, second controller part and electric current are heavy;
Described the second input is connected to described anode, and described the second output is connected to ground;
One end of described second controller part is connected to described the second input, the other end is connected to the input that described electric current is heavy, and its control end is connected to the 4th signal, and the vibration trend of described the 4th signal is identical with described comparison signal;
The output that described electric current is heavy is connected to described the second output.
8. oscillating circuit as claimed in claim 7, is characterized in that, described second controller part is the second nmos pass transistor; The drain electrode of described the second nmos pass transistor is connected to described the second input, and source electrode is connected to the input that described electric current is heavy, and grid is connected to the output of described comparing unit.
9. oscillating circuit as claimed in claim 1, is characterized in that, described reference cell comprises: the 3rd input, the 3rd output, the 3rd control device, the first resistance device and the second resistance device;
Described the 3rd input is connected to respectively the 3rd electric current and described negative terminal;
One end of described the 3rd control device is connected to described the 3rd output, the other end is connected to described negative terminal, and its control end is connected to the 5th signal, and the vibration trend of described the 5th signal is identical with described comparison signal;
One end of described the first resistance device is connected to described the 3rd input, the other end is connected to described the 3rd output, and one end of described the second resistance device is connected to described the 3rd output, the other end is connected to ground.
10. oscillating circuit as claimed in claim 9, is characterized in that, described the 3rd control device is the 3rd nmos pass transistor; The drain electrode of described the 3rd nmos pass transistor is connected to described negative terminal, and source electrode is connected to described the 3rd output, and grid is connected to the output of described comparing unit.
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| CN108494366A (en) * | 2018-03-12 | 2018-09-04 | 京东方科技集团股份有限公司 | Oscillator and electronic equipment |
| CN109283966A (en) * | 2018-08-17 | 2019-01-29 | 维沃移动通信有限公司 | A kind of clock circuit and terminal |
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| Publication number | Publication date |
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| CN103825555B (en) | 2017-06-06 |
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