CN100539397C - Multi-phase voltage control oscillator - Google Patents
Multi-phase voltage control oscillator Download PDFInfo
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- CN100539397C CN100539397C CNB2004100904905A CN200410090490A CN100539397C CN 100539397 C CN100539397 C CN 100539397C CN B2004100904905 A CNB2004100904905 A CN B2004100904905A CN 200410090490 A CN200410090490 A CN 200410090490A CN 100539397 C CN100539397 C CN 100539397C
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- control oscillator
- phase voltage
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Abstract
A kind of multi-phase voltage control oscillator, it comprises an at least one toroidal oscillation unit and a resistance ring, and this toroidal oscillation unit is connected in series by a plurality of phase delay assemblies and is formed, and this resistance ring is connected in series by a plurality of resistor assembly and forms; Tandem node in each toroidal oscillation unit is electrically connected to the tandem node in this resistance ring, makes this toroidal oscillation unit can produce a plurality of oscillation signals with homogeneous phase potential difference.
Description
Technical field
The present invention relates to a kind of voltage-controlled oscillator, particularly relate to a kind of multi-phase voltage control oscillator.
Background technology
At present, multi-phase voltage control oscillator (VCO) has been widely used in data answering system (data-recovery systems) and phase-locked loop (PLLs) circuit, it can apply voltage swing by control one, a plurality ofly have same frequency but the oscillation signal of out of phase and export, wherein the frequency of each oscillation signal with apply voltage swing and be directly proportional.Desirable, the signal phase place that multi-phase voltage control oscillator is exported is to be evenly distributed in the phase angle scope of 360 degree, to reach the Optimal Control that it is used.
Typical multi-phase voltage control oscillator forms by N Delay Element, as shown in Figure 1.Multi-phase voltage control oscillator 100 has comprised N the differential delay assembly 102 of serial connection mutually.Each differential delay assembly 102 has two input 102a, 102b and two output 102c, 102d, and is connected in series mutually and constitutes a circular type shaker, makes all output 102c, 102d to produce and a plurality ofly has same frequency but the oscillation signal of out of phase.Under this configuration, the number of the above-mentioned oscillation signal that produces is that the quantity by Delay Element decides, therefore, when will for example producing: during the oscillation signal of 32 outs of phase, just need 16 differential delay assemblies 102 to go to realize by multi-phase voltage control oscillator 100.
Yet, because each Delay Element is according to its circuit characteristic, all has the specified signal delay time, limit so the phase difference between the oscillation signal that multi-phase voltage control oscillator 100 is produced then can be subjected to the above-mentioned signal delay time length of Delay Element, and can not obtain less phase difference.
In order to access littler phase difference, known multi-phase voltage control oscillator is to finish by phase run (interpolation) mode.Multi-phase voltage control oscillator 100 with Fig. 1 is an example, and the phase run mode can be produced an oscillation signal with intermediate phase between two oscillation signals that it produced.Therefore, can utilize the Delay Element of equal number and realize more phase difference by the formed voltage-controlled oscillator of this kind mode.
Yet, the phase difference that this kind mode is produced, its uniformity is subjected to condition effect such as manufacturing process or temperature easily, therefore will reach uniform phase difference when high and low frequency and be not easy very much.
Summary of the invention
One of purpose of the present invention is to provide a kind of multi-phase voltage control oscillator, and it can utilize relative simple circuit configuration, produces the more and uniform leggy oscillation signal of PHASE DISTRIBUTION of number.
According to embodiments of the invention, disclosed a kind of multi-phase voltage control oscillator, in order to produce a plurality of oscillation signals with homogeneous phase potential difference, this multi-phase voltage control oscillator includes a plurality of toroidal oscillations unit, each toroidal oscillation unit has a plurality of phase delay assemblies and a plurality of first connected node, and described phase delay assembly electrically is connected in series mutually via described first connected node; And a resistance ring, having a plurality of resistor assemblies and a plurality of second connected node, described resistor assembly is electrical serial connection mutually via described second connected node; Wherein said second connected node distinctly is electrically connected to described first connected node, makes described first connected node provide described and has same frequency of oscillation and the signal of out of phase.
According to embodiments of the invention, also disclosed a kind of multi-phase voltage control oscillator, it can be according to an input control voltage, has same frequency of oscillation and the signal of out of phase and provide a plurality of, this multi-phase voltage control oscillator comprises a plurality of toroidal oscillations unit, and wherein each toroidal oscillation unit pack contains a plurality of mutual serial connections and forms ring-like Delay Element; And a phase place strangulation unit, having a plurality of nodes, described node is respectively coupled to described Delay Element, the phase place of the oscillation signal of being exported with the described Delay Element of strangulation.
In order to make above and other objects of the present invention, feature and the advantage can be more obvious, hereinafter will be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 is the circuit diagram of the multi-phase voltage control oscillator in the known technology.
Fig. 2 is the circuit diagram of leggy voltage controller according to an embodiment of the invention.
Fig. 3 a is a schematic diagram in order to the mos field effect transistor of realizing resistance R.
Fig. 3 b is the equivalent circuit diagram of Fig. 3 a.
Fig. 4 is the circuit diagram of another embodiment of the present invention leggy voltage controller.
The reference numeral explanation
A1-a32 connected node b1-b32 connected node
R resistance Vc controls voltage
100 voltage-controlled oscillators, 102 differential delay assemblies
102a, 102b input 102c, 102d output
200 voltage-controlled oscillators, 202 toroidal oscillation unit
204 resistance rings, 206 differential delay assemblies
206a, 206b input 206c, 206d output
208 conducting wires, 300 mos field effect transistor
304 drain electrodes of 302 grids
306 source electrodes
Embodiment
Now please refer to Fig. 2, it is the circuit diagram of multi-phase voltage control oscillator 200 according to an embodiment of the invention.In this embodiment, multi-phase voltage control oscillator 200 can provide 32 to have same frequency of oscillation but the oscillation signal of out of phase, and the frequency of oscillation of each oscillation signal changes by the size of adjusting a control voltage Vc.
In present embodiment, multi-phase voltage control oscillator 200 comprises four toroidal oscillation unit 202 and a phase place strangulation unit (phase clamping unit) 204.Each toroidal oscillation unit 202 also has four differential delay assemblies 206, and each differential delay assembly 206 has two input 206a, 206b and two output 206c, 206d, wherein each differential delay assembly 206 has the signal delay time, makes to have a delay between signal on each input 206a, 206b and the signal on each output 206c, the 206d.In addition, the signal phase difference between input 206a and 206b is 180 degree, and the signal phase difference between output 206c and 206d also is 180 degree.
Shown differential delay assembly 206 uses control voltage Vc as its power supply supply voltage (being Vdd) in present embodiment, heals when big as Vc, and frequency of oscillation is promptly higher, otherwise, when Vc more hour, frequency of oscillation is then lower.The configuration of differential delay assembly 206 and operating principle are known for those skilled in the art extensively knows herein, so do not give unnecessary details at this.
In each toroidal oscillation unit 202, output 206c, the 206d of the first order (leftmost side) differential delay assembly 206 electrically connects with input 206a, the 206b of second level differential delay assembly 206 respectively, and output 206c, the 206d of second level differential delay assembly 206 electrically connect with input 206a, the 206b of next stage differential delay assembly 206 respectively, by that analogy; At last, output 206c, the 206d of the fourth stage (rightmost side) differential delay assembly 206 electrically connects in opposite polarity mode with input 206b, the 206a of the first order (leftmost side) differential delay assembly 206 respectively, to form toroidal oscillation unit 202.
Under above-mentioned configuration, there are 32 connected nodes these four toroidal oscillation unit 202 definition altogether, and it is denoted as a1 to a32 respectively, as shown in Figure 2.Each connected node is positioned between output 206c, the 206d and input 206a, 206b of the two differential delay assemblies 206 that are connected in series.In other words, the differential Delay Element 206 of each grade is to be electrically connected to next stage differential delay assembly 206 via two connected nodes among the a1 to a32 respectively.
Phase place strangulation unit 204 is coupled to each node of above-mentioned described toroidal oscillation unit 202, be used for relying on its electrical characteristic, phase place between the oscillation signal on above-mentioned each node is clamped to specific relativeness, in present embodiment, to guarantee the even distribution of described oscillation signal phase place.In the present embodiment shown in Fig. 2, phase place strangulation unit 204 is to realize with a resistance ring that includes a plurality of resistance.
Resistance ring 204 is to have comprised 32 resistance R and 32 connected node b1 to b32, and wherein each resistance R is concatenated into a ring type structure via each connected node b1 to b32 respectively.In present embodiment, the resistance size of each resistance R is equal in fact.
In this embodiment, each connected node b1 to b32 of resistance ring 204 electrically connects with each connected node a1 to a32 of toroidal oscillation unit 202 respectively by conducting wire 208 and (shows, that is b1 be connected to a1, b2 be connected to a2 ..., b32 is connected to a32), make these four toroidal oscillation unit 202 be electrically connected to each other, to constitute multi-phase voltage control oscillator 200 by the connected node b1 to b32 of resistance ring 204.32 oscillation signals that multi-phase voltage control oscillator 200 provided are exported via output 206c, the 206d (being connected node a1 to a32) of all differential delay assemblies 206.
In multi-phase voltage control oscillator 200, each resistance R of resistance ring 204 is as the coupling assembling between each toroidal oscillation unit 202, and, therefore can have uniform phase difference between 32 oscillation signals that make output 206c, the 206d (being connected node a1 to a32) of all differential delay assemblies 206 be provided by electric resistance partial pressure effect meeting because each resistance R has identical resistance value.And under the configuration shown in the above-mentioned present embodiment, the oscillation signal of being read on the two-end-point of each resistance R on the resistance ring 204 will have adjacent phase place.
Please note; though in this specification, only disclose an embodiment of the coupling mode between described toroidal oscillation unit 202 and this phase place strangulation unit (being resistance ring) 204; those skilled in the art should understand; other spirit according to the invention; can reach similar phase place strangulation effect, guarantee the equally distributed coupling mode of phase place, all belong to the scope of institute of the present invention desire protection.
Each resistance R in the above-mentioned resistance ring 204 can be utilized plain conductor or polycrystalline silicon conducting wire to wait and realize, and also can be realized by a mos field effect transistor 300 (MOSFET) in present embodiment, is depicted as a nmos pass transistor as Fig. 3 a.Mos field effect transistor 300 has comprised a grid 302, a drain electrode 304 and an one source pole 306, and can utilize the voltage that puts on its grid 302 to control its equivalent resistance.Fig. 3 b is the equivalent circuit diagram of Fig. 3 a.In present embodiment, control voltage Vc in order to the control frequency of oscillation also can put on the grid 302, shown in Fig. 3 a, size with the equivalent resistance R of control drain-source interpolar, so then when control voltage Vc lower and make frequency of oscillation hour, also can make each resistance R in the resistance ring 204 bigger simultaneously, so that the 202 easily starting of oscillations of toroidal oscillation unit; And when control voltage Vc higher and when making frequency of oscillation big, then can make each resistance R in the resistance ring 204 less simultaneously, so that oscillating characteristic is preferable.
It should be noted that the toroidal oscillation unit 202 of present embodiment does not limit by the differential delay assembly with two inputs, two outputs and realizes, other also can realize identical purpose as the combination of circuits (single-ended mode) of the reverser of the single output of single input.Though and in present embodiment, phase place strangulation unit 204 is that the pattern with resistance ring realizes that other any circuit configurations that can reach similar phase place strangulation function also may be implemented in this.In addition, the number of the Delay Element in the number of toroidal oscillation unit 202 and each the toroidal oscillation unit 202 is not limited to four, and the combination of other number also can realize identical purpose.
Even only use a toroidal oscillation unit also can reach identical purpose.Please refer to Fig. 4, it shows the circuit diagram that only uses the multi-phase voltage control oscillator of a toroidal oscillation unit in another embodiment of the present invention, and those skilled in the art should understand its operating principle to previous embodiment is similar, so do not give unnecessary details at this.
Though the present invention discloses with previous embodiment, so it is not in order to limiting the present invention, those skilled in the art under the premise without departing from the spirit and scope of the present invention, can do various changes and modification.Therefore protection scope of the present invention is as the criterion with the application's claim.
Claims (6)
1. multi-phase voltage control oscillator, it can have same frequency of oscillation and the signal of out of phase and provide a plurality of according to an input control voltage, and this multi-phase voltage control oscillator comprises:
A plurality of toroidal oscillations unit, this toroidal oscillation unit have a plurality of phase delay assemblies and a plurality of first connected node, and described phase delay assembly electrically is connected in series mutually via described first connected node; And
One resistance ring has a plurality of resistor assemblies and a plurality of second connected node, and described resistor assembly electrically is connected in series mutually via described second connected node;
Wherein said second connected node is electrically connected to described first connected node respectively so that described a plurality of annular oscillating units are electrically connected, and makes described first connected node that the described signal that has same frequency of oscillation and have the out of phase of uniform phase difference is provided.
2. multi-phase voltage control oscillator according to claim 1, wherein each phase delay assembly is a reverser.
3. multi-phase voltage control oscillator according to claim 1, wherein each phase delay assembly is a differential delay assembly.
4. multi-phase voltage control oscillator according to claim 1, wherein each resistor assembly has identical resistance value.
5. multi-phase voltage control oscillator according to claim 1, wherein each resistor assembly can be realized by a mos field effect transistor.
6. multi-phase voltage control oscillator according to claim 5, wherein the grid of this mos field effect transistor is electrically connected to this input control voltage, to control this transistorized resistance value by input control voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100904905A CN100539397C (en) | 2004-11-10 | 2004-11-10 | Multi-phase voltage control oscillator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100904905A CN100539397C (en) | 2004-11-10 | 2004-11-10 | Multi-phase voltage control oscillator |
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| CN1773841A CN1773841A (en) | 2006-05-17 |
| CN100539397C true CN100539397C (en) | 2009-09-09 |
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| US9178498B2 (en) * | 2013-10-03 | 2015-11-03 | Futurwei Technologies, Inc. | Reconfigurable multi-path injection locked oscillator |
| CN117498804B (en) * | 2024-01-03 | 2024-04-05 | 深圳飞骧科技股份有限公司 | Two-stage differential annular voltage-controlled oscillator and radio frequency chip module |
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