CN1614873A - Voltage controlled oscillator for reducing gain surge - Google Patents
Voltage controlled oscillator for reducing gain surge Download PDFInfo
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- CN1614873A CN1614873A CN 200410009955 CN200410009955A CN1614873A CN 1614873 A CN1614873 A CN 1614873A CN 200410009955 CN200410009955 CN 200410009955 CN 200410009955 A CN200410009955 A CN 200410009955A CN 1614873 A CN1614873 A CN 1614873A
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Abstract
The invention consists of LC resonance loop used in providing negative conductance active device. The voltage control end of the voltage controlled oscillator is connected with the voltage transform circuit. The invention can vary the voltage of voltage controlled oscillator to vary the range of frequency modulation and control the gain of voltage controlled oscillator.
Description
Technical field
The present invention relates to a kind of voltage controlled oscillator, relate in particular to the little voltage controlled oscillator of a kind of gain fluctuation.
Background technology
In more than ten years in the past, personal wireless communications system such as beep-pager, cordless telephone, simulation and digital cellular telephone and Digital Television, broadcasting have obtained fast development, and radio communication becomes most important industry after the PC industry.Volume is little, low in energy consumption, cost is low because integrated circuit has, flourish the developing rapidly of facilitating radio frequency integrated circuit of wireless communication technology.At present, radio frequency integrated circuit has become one of microelectronics important field of research.Design and study high performance Key Circuit module and become the vital motive force of promotion radio frequency integrated circuit technological progress.Voltage controlled oscillator promptly is one of wherein crucial circuit module.
Typical voltage-controlled oscillator circuit as shown in Figure 1.C wherein
vBe the electric capacity of varactor, C
cIt is coupling capacitance.Obtain total capacitor C after two varactor electric capacity and two coupling capacitance series connection.V is the control voltage of varactor, and L is an inductance.Other MOS device provides keeps the required energy of LC resonant tank persistent oscillation.Tail current source I
BiasProvide circuit working needed bias current.Can obtain different LC resonant tank capacitances by the value that changes control voltage V, this process is finished by varactor.Total capacitance value C is the function of control voltage V, and the value of C and V is corresponding one by one, i.e. C=C (V).When control voltage V changed, corresponding total capacitance C also changed.Because
So the frequency of oscillation of output signal also is changed.
Except above-mentioned capacitance by the adjusting varactor changes the method for frequency, also has the method for another frequency modulation: use numerically controlled switched-capacitor circuit.As shown in Figure 2, numerically controlled switched-capacitor circuit is by digital control position A
2A
1A
0Connect or disconnect switch, thus the decision capacitor C
2, C
1And C
0Whether be linked into the LC resonant tank.Work as A
2A
1A
0When having different digital levels, the electric capacity in the switched capacitor array will be linked into different compound modes in the LC resonant tank of oscillator, thereby total equivalent capacitance value C is changed.What this method realized is the discontinuous adjustment of output signal frequency, is called coarse adjustment.This structure just obtains the frequency modulation curve shown in solid line among Fig. 3 in conjunction with aforementioned method by varactor frequency modulation, and wherein abscissa is the control voltage V of varactor, and ordinate is the frequency of oscillation f of output signal
OutDotted line among the figure is corresponding to the situation of not using switched-capacitor circuit.As can be seen from Figure 3, reasonably the capacitance in the selector switch capacitor array can make solid line and dotted line have identical frequency-tuning range, i.e. f
Min~f
MaxDifference is, if do not use switched-capacitor circuit, then realize be one from f
MinTo f
MaxContinuous frequency modulation curve (dotted line), and use switched-capacitor circuit, what obtain is one group of frequency modulation curve (solid line), must an overlapped part between the adjacent curve in the ordinate direction, as shown in Figure 3, to cover from f
MinTo f
MaxIn each frequency values.Each bar curve is all corresponding with the value of the digital control position of switched capacitor array, is example with Fig. 3, from " 000 " until " 111 ", totally eight frequency modulation curves.After using switched-capacitor circuit, numerically controlled switch has been realized the coarse adjustment of output signal frequency, and the control voltage V of varactor has kept the function to frequency trim.
The structure of Fig. 2 is used after the switching capacity, and actual pressuring controlling oscillator frequency is determined by following formula:
Wherein, C
SwitchThe summation that is the switching capacity of connection (is C
2, C
1And C
0Or the total capacitance after its combination), C
VarBe approximately equal to the electric capacity of two varactors and the value after the series connection of two coupling capacitances, promptly
The C of the solid line correspondence on close top among Fig. 3
SwitchLess, the C of the solid line correspondence of close bottom
SwitchBigger.The pairing tuning range of each bar solid line all is by C
vVariation realize.When using switching capacity, actual frequency modulation curve and Fig. 3 be difference to some extent, as shown in Figure 4.Both differences are near the slope of curve on top bigger, and distance between centers of tracks is bigger; And less near the slope of curve of bottom, distance between centers of tracks is less.Slope of a curve is one of important indicator of voltage controlled oscillator: K
VCO, i.e. the gain of voltage controlled oscillator (unit is Hz/V, changes caused frequency change corresponding to unit voltage).Therefore, the K of different curve correspondences among Fig. 4
VCOMarked change takes place.Its reason is: for the curve near top, because C
WitchLess, C
vThe relative variation of the caused total capacitance of variation bigger; For curve, because C near the bottom
SwitchBigger, C
vThe relative variation of the caused total capacitance of variation less.
Voltage controlled oscillator is a part in the phase-locked loop circuit.Voltage controlled oscillator gain K
VCOFluctuation can cause the stability problem of phase-locked loop circuit.In order to guarantee the stability of phase-locked loop, when the design phase-locked loop, just consider K usually
VCOVariable quantity with 3~5 times.The purpose of doing like this is: even K
VCOMarked change takes place, and phase-locked loop still can steady operation.But some characteristics that this direct result of bringing is a phase-locked loop can not be brought into play to greatest extent, for example the locking time of phase-locked loop.Therefore, this solution is to be cost with the characteristic of sacrificing phase-locked loop.And an effective solution is exactly to reduce K when the design voltage controlled oscillator
VCOFluctuation, but the voltage controlled oscillator of this type of relevant design not at present.
Summary of the invention
There is gain K at above-mentioned existing voltage controlled oscillator
VCOSignificantly this problem and shortage of fluctuation takes place, and the purpose of this invention is to provide a kind of voltage controlled oscillator for reducing gain surge.
The present invention is achieved in that a kind of voltage controlled oscillator for reducing gain surge, comprises the LC resonant tank, is used to provide the active device of negative conductance, the circuit of the voltage control termination voltage transformation of this voltage controlled oscillator.
Further, the described voltage conversion circuit voltage signal that is used for changing in the certain voltage scope transforms to the voltage signal that changes in another voltage range.
Further, the circuit of described voltage transformation is the voltage conversion circuit of digit order number control.
Further, the circuit of described voltage transformation comprises voltage source, control switch and the corresponding bleeder circuit that is parallel with resistance, and input voltage is through receiving the voltage controling end of voltage controlled oscillator behind the voltage transformation.
The present invention is by the working voltage translation circuit, makes the actual voltage range that can control voltage controlled oscillator variable, thereby makes actual tuning range variable, like this, just can control the gain of voltage controlled oscillator.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is made detailed description;
Fig. 1 is typical voltage-controlled oscillator circuit figure;
Fig. 2 is digital switch electric capacity voltage-controlled oscillator circuit figure;
Fig. 3 is the desirable frequency modulation curve synoptic diagram of voltage controlled oscillator;
Fig. 4 is that the fluctuation schematic diagram takes place in the voltage controlled oscillator gain;
Fig. 5 is a structural representation of the present invention;
Fig. 6 is the input-output characteristic schematic diagram of voltage conversion circuit;
Fig. 7 is an example of voltage conversion circuit;
Fig. 8 is the schematic diagram that changes the frequency modulation curve by voltage transformation;
Fig. 9 is to use the frequency modulation curve synoptic diagram that obtains before and after the present invention.
Embodiment
As shown in Figure 5, the present invention is improved on the basis of voltage-controlled oscillator circuit in Fig. 2 to form.Compare with Fig. 2, the present invention is earlier with control voltage of voltage-controlled oscillator V
1Through a voltage conversion circuit, obtain actual control voltage V
2, then with V
2Deliver to the control end of varactor in the voltage controlled oscillator.The function of this voltage conversion circuit is: the voltage control signal that will change in the certain voltage scope transforms to the voltage control signal that changes in another voltage range.This process as shown in Figure 6, for example, as voltage V
1From V
X1To V
X2During variation, V
2Then from V
Y1To V
Y2Change.Fig. 7 has provided a specific implementation form of voltage conversion circuit, and it is by digital control position A
2A
1A
0Synchronization Control.By to R among Fig. 7
0~R
3Value design, can determine suitable V
2Excursion.That Fig. 6 provides is V
1And V
2Situation when linear, and by design V
1And V
2Between respective function relation, can make K
VCOFluctuation further optimize.
The present invention is by the working voltage translation circuit, makes the actual voltage range that can control voltage controlled oscillator variable, thereby makes actual tuning range variable, like this, just can control the gain of voltage controlled oscillator.As shown in Figure 8, original control voltage changes from 0 to VDD (VDD is a supply voltage), corresponding to frequency modulation curve A C; By voltage transformation, make the voltage (V among Fig. 5 of working control varactor
2) scope is from V
xChange (V to VDD
xBetween 0 to VDD), corresponding to frequency modulation curve B C; BC and the original control voltage (V among Fig. 5
1) between corresponding relation be curve D C.
Fig. 9 is for using the frequency modulation curve synoptic diagram of the present invention front and back voltage controlled oscillator.The solid line correspondence be the frequency modulation curve that does not use when of the present invention, dotted line is to use the frequency modulation curve behind the present invention.By the conversion of control voltage, can well make the K of each bar frequency modulation curve
VCOSubstantially remain unchanged.
Claims (4)
1, a kind of voltage controlled oscillator for reducing gain surge comprises the LC resonant tank, is used to provide the active device of negative conductance, it is characterized in that the circuit of the voltage control termination voltage transformation of this voltage controlled oscillator.
2, voltage controlled oscillator for reducing gain surge as claimed in claim 1 is characterized in that, the circuit of described voltage transformation is used for changing in the certain voltage scope voltage control signal transforms to the voltage control signal that changes in another voltage range.
3, voltage controlled oscillator for reducing gain surge as claimed in claim 1 or 2 is characterized in that, the circuit of described voltage transformation is the voltage conversion circuit of digit order number control.
4, voltage controlled oscillator for reducing gain surge as claimed in claim 3, it is characterized in that, the circuit of described voltage transformation comprises voltage source, control switch and the corresponding bleeder circuit that is parallel with resistance, and input voltage is through receiving the voltage controling end of voltage controlled oscillator behind the voltage transformation.
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CN200410009955XA CN100407569C (en) | 2004-12-03 | 2004-12-03 | Voltage controlled oscillator for reducing gain surge |
Applications Claiming Priority (1)
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CN200410009955XA CN100407569C (en) | 2004-12-03 | 2004-12-03 | Voltage controlled oscillator for reducing gain surge |
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CN1614873A true CN1614873A (en) | 2005-05-11 |
CN100407569C CN100407569C (en) | 2008-07-30 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102035467A (en) * | 2005-11-09 | 2011-04-27 | 瑞萨电子株式会社 | Oscillator and data processing equipment using the same and voltage control oscillator and data processing equipment using voltage control oscillator |
CN103187923A (en) * | 2011-12-28 | 2013-07-03 | 国民技术股份有限公司 | Control method and control device for tail current of inductor and capacitor based voltage-controlled oscillator |
CN105305964A (en) * | 2015-10-30 | 2016-02-03 | 江苏大学 | Novel equivalent capacitance array linearity inductance capacitance voltage controlled oscillator |
CN103187923B (en) * | 2011-12-28 | 2016-12-14 | 国民技术股份有限公司 | The control method of inductance capacitance type voltage controlled oscillator tail current and device |
CN106330097A (en) * | 2016-08-19 | 2017-01-11 | 西安电子科技大学 | InP HBT voltage-controlled oscillator based on coupled transmission lines |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3585029B2 (en) * | 1999-05-26 | 2004-11-04 | 三菱電機株式会社 | Phase locked loop circuit |
JP2001284996A (en) * | 2000-03-31 | 2001-10-12 | Matsushita Electric Ind Co Ltd | Gain controller |
FR2833432A1 (en) * | 2001-12-11 | 2003-06-13 | Koninkl Philips Electronics Nv | TEMPERATURE COMPENSATION DEVICE AND ELECTRONIC APPARATUS COMPRISING SUCH A DEVICE |
JP3590026B2 (en) * | 2002-01-16 | 2004-11-17 | 株式会社東芝 | Voltage controlled oscillation circuit and semiconductor integrated circuit having the same |
JP2004241933A (en) * | 2003-02-04 | 2004-08-26 | Sanyo Electric Co Ltd | Pll circuit |
-
2004
- 2004-12-03 CN CN200410009955XA patent/CN100407569C/en active Active
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102035467A (en) * | 2005-11-09 | 2011-04-27 | 瑞萨电子株式会社 | Oscillator and data processing equipment using the same and voltage control oscillator and data processing equipment using voltage control oscillator |
CN103187923A (en) * | 2011-12-28 | 2013-07-03 | 国民技术股份有限公司 | Control method and control device for tail current of inductor and capacitor based voltage-controlled oscillator |
CN103187923B (en) * | 2011-12-28 | 2016-12-14 | 国民技术股份有限公司 | The control method of inductance capacitance type voltage controlled oscillator tail current and device |
CN105305964A (en) * | 2015-10-30 | 2016-02-03 | 江苏大学 | Novel equivalent capacitance array linearity inductance capacitance voltage controlled oscillator |
CN105305964B (en) * | 2015-10-30 | 2018-06-01 | 江苏大学 | The new linear LC voltage controlled oscillator of equivalent capacity array |
CN106330097A (en) * | 2016-08-19 | 2017-01-11 | 西安电子科技大学 | InP HBT voltage-controlled oscillator based on coupled transmission lines |
CN106330097B (en) * | 2016-08-19 | 2019-02-19 | 西安电子科技大学 | InP HBT voltage controlled oscillator based on coupled transmission line |
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Publication number | Publication date |
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CN100407569C (en) | 2008-07-30 |
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Effective date of registration: 20110315 Address after: 100871 Beijing the Summer Palace Road, Haidian District, No. 5 Co-patentee after: Semiconductor Manufacturing International (Shanghai) Corporation Patentee after: Peking University Address before: 100871 Beijing the Summer Palace Road, Haidian District, No. 5 Patentee before: Peking University |