CN207427122U - A kind of phaselocked loop and its voltage controlled oscillator - Google Patents
A kind of phaselocked loop and its voltage controlled oscillator Download PDFInfo
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Abstract
The utility model belongs to field of communication technology, provides a kind of phaselocked loop and its voltage controlled oscillator.In the utility model, by using including Voltage to current transducer module, voltage regulator module, mirror module, the voltage controlled oscillator of power module and ring oscillator, so that Voltage to current transducer module is according to control the first electric current of voltage output and the second electric current, mirror module generates supply voltage according to the first electric current and supply voltage, the difference of supply voltage and supply voltage is less than predetermined threshold value, voltage regulator module carries out voltage stabilizing and noise reduction process according to reference voltage to supply voltage, power module receives the second electric current, 3rd electric current is generated according to the second electric current, and supply voltage provides operating voltage to ring oscillator according to treated, so as to ring oscillator under the action of operating voltage according to the frequency of the 3rd current control clock signal.Voltage controlled oscillator provided by the utility model can work under low suppling voltage, and with big band wide power rejection ability.
Description
Technical field
The utility model belongs to field of communication technology more particularly to a kind of phaselocked loop and its voltage controlled oscillator.
Background technology
As indispensable part in high-speed communication system, when phaselocked loop is mainly that high-speed communication system provides suitable
Clock frequency, and voltage controlled oscillator, as the important module in phaselocked loop, the quality of performance often relates to Design of PLL
Success or failure.
At present, due to becoming higher and higher with clock frequency, system becomes higher the noise perfomiance requirements of phaselocked loop, because
This, the important factor in order of the power supply noise of system as voltage controlled oscillator performance so that how in a larger bandwidth,
Particularly under medium-high frequency, a kind of voltage controlled oscillator with higher power supply rejection ability is designed, it appears particularly important；In addition, with
The reduction of the characteristic size of chip processing procedure, the power supply voltage of chip reduces accordingly therewith, the ceiling of circuit design
Effect (headroom) brings every circuit designers one larger challenge.In conclusion how at low supply voltages
Design one has the challenge that the voltage controlled oscillator greatly with wide power rejection ability is industry.
Therefore, it is necessary to a kind of technical solution is provided, to solve above-mentioned technical problem.
Utility model content
It, can be in work under low suppling voltage the purpose of this utility model is to provide a kind of phaselocked loop and its voltage controlled oscillator
Make, and with big band wide power rejection ability.
The utility model is realized in this way a kind of voltage controlled oscillator, the voltage controlled oscillator includes：
Voltage to current transducer module, voltage regulator module, mirror module, power module and ring oscillator；
The input terminal of the Voltage to current transducer module receives control voltage, and the first of the Voltage to current transducer module is defeated
Outlet is connected with the first input end of the mirror module, second output terminal and the power supply of the Voltage to current transducer module
The first input end connection of module, the second input terminal of the mirror module receive supply voltage, the output of the mirror module
End connects altogether with the first input end of the voltage regulator module and the second input terminal of the power module, the voltage adjustment
Second input terminal of module receives reference voltage, the output head grounding of the voltage regulator module, the output of the power module
End is connected with the input terminal of the ring oscillator, the output terminal output clock signal of the ring oscillator；
The Voltage to current transducer module is according to control first electric current of voltage output and the second electric current；The mirror image mould
Root tuber generates supply voltage, the difference of the supply voltage and the supply voltage according to first electric current and the supply voltage
Less than predetermined threshold value；The voltage regulator module is carried out at voltage stabilizing and noise reduction the supply voltage according to the reference voltage
Reason；The power module receives second electric current, and the 3rd electric current is generated according to second electric current, and electric according to treated
Source voltage generation operating voltage, and the operating voltage is exported to the ring oscillator, the ring oscillator is described
Work under the action of operating voltage, and according to the 3rd current control clock signal frequency.
The another object of the utility model is to provide a kind of phaselocked loop, and the phaselocked loop includes above-mentioned voltage controlled oscillation
Device.
In the utility model, by using including Voltage to current transducer module, voltage regulator module, mirror module, electricity
The voltage controlled oscillator of source module and ring oscillator so that Voltage to current transducer module is according to control the first electric current of voltage output
With the second electric current, mirror module generates the difference of supply voltage, supply voltage and supply voltage according to the first electric current and supply voltage
Value is less than predetermined threshold value, and voltage regulator module carries out voltage stabilizing and noise reduction process, power module according to reference voltage to supply voltage
3rd electric current is generated according to the second electric current, and supply voltage provides operating voltage to ring oscillator according to treated, so as to
Ring oscillator under the action of operating voltage according to the frequency of the 3rd current control clock signal, due to the work of ring oscillator
It is obtained as voltage according to supply voltage, and supply voltage can also be kept steady when larger fluctuation occurs for supply voltage
It is fixed, and when supply voltage is smaller, power supply power supply can also ensure that ring oscillator works, therefore, provided by the utility model
Voltage controlled oscillator can work under low suppling voltage, and with big band wide power rejection ability.
Description of the drawings
Fig. 1 is the modular structure schematic diagram for the voltage controlled oscillator that one embodiment of the utility model is provided；
Fig. 2 is the modular structure schematic diagram for the voltage controlled oscillator that another embodiment of the utility model is provided；
Fig. 3 is the electrical block diagram for the voltage controlled oscillator that one embodiment of the utility model is provided；
Fig. 4 is that the equivalent circuit of the voltage regulator module in the voltage controlled oscillator that one embodiment of the utility model is provided shows
It is intended to.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
The realization of the utility model is described in detail below in conjunction with specific attached drawing：
Fig. 1 shows the modular structure for the voltage controlled oscillator 10 that one embodiment of the utility model is provided, for the ease of saying
It is bright, part related to the present embodiment is illustrated only, details are as follows：
As shown in Figure 1, the voltage controlled oscillator 10 that the utility model embodiment is provided includes：Voltage to current transducer module
100th, voltage regulator module 101, mirror module 102, power module 103 and ring oscillator 104.
Wherein, the input terminal of Voltage to current transducer module 100 receives control voltage Vctrl, Voltage to current transducer module 100
The first output terminal be connected with the first input end of mirror module 102, the second output terminal of Voltage to current transducer module 100 and electricity
The first input end connection of source module 103, the second input terminal of mirror module 102 receive supply voltage VDD, mirror module 102
Output terminal connect altogether with the first input end of voltage regulator module 101 and the second input terminal of power module 103, voltage adjustment
The second input terminal reception reference voltage Vref of module 101, the output head grounding of voltage regulator module 101, power module 103
Output terminal is connected with the input terminal of ring oscillator 104, the output terminal output clock signal Clock of ring oscillator 104.
Specifically, Voltage to current transducer module 100 exports the first electric current I0 and the second electric current according to control voltage Vctrl
I1；Mirror module 102 generates supply voltage Vrg, supply voltage Vrg and power supply electricity according to the first electric current I0 and supply voltage VDD
The difference of VDD is pressed to be less than predetermined threshold value；Voltage regulator module 101 carries out voltage stabilizing according to reference voltage Vref to supply voltage Vrg
With noise reduction process；Power module 103 receives the second electric current I1, and the 3rd electric current I4 is generated according to the second electric current I1, and according to processing
Supply voltage Vrg generation operating voltage Vro afterwards, and operating voltage Vro is exported to ring oscillator 104, ring oscillator
104 work under the action of operating voltage Vro, and the frequency of clock signal Clock is controlled according to the 3rd electric current I4.
Wherein, in the utility model embodiment, existing voltage and electric current may be employed in Voltage to current transducer module 100
Conversion circuit realizes that details are not described herein again；In addition, predetermined threshold value refers to supply voltage VDD and electricity in circuit design process
Difference between the voltage Vrg of source can not be more than the numerical value of the value, if for example, supply voltage VDD is 1.0V, supply voltage Vrg is
0.9V, then predetermined threshold value be up to 0.1V.
Since the reduction of characteristic size in prior art chips processing procedure causes the supply voltage of chip to reduce accordingly, from
And cause the ceiling effect in circuit design process, therefore, voltage controlled oscillator 10 provided by the utility model is so that power supply electricity
The difference between VDD and supply voltage Vrg is pressed to be less than predetermined predetermined threshold value, so as to ensure that supply voltage Vrg will not be too low, into
And the operating voltage obtained according to supply voltage Vrg Vro is allowd to ensure the normal work of ring oscillator 104, and then make
Obtaining voltage controlled oscillator 10 can also work at low voltage, eliminate the ceiling effect of circuit.
In addition, voltage regulator module 101 carries out voltage stabilizing and noise reduction process according to reference voltage Vref to supply voltage Vrg,
So that even if big fluctuation occurs for supply voltage VDD, supply voltage Vrg can also stablize in a definite value, will not be because of power supply
The fluctuation of voltage VDD and fluctuate, and supply voltage Vrg have good noise inhibiting ability so that this practicality
The voltage controlled oscillator 10 that new embodiment provides has preferable power supply rejection ability.
Further, as one preferred embodiment of the utility model, as shown in figure 3, mirror module 102 includes：First
Switch element PM0, low-pass filter 102a and second switch element PM1.
Wherein, the input terminal of first switching element PM0 and the input terminal of second switch element PM1 connect to form mirror module altogether
102 the second input terminal, the output terminal of first switching element PM0 are the first input end of mirror module 102, and first switch
The output terminal of element PM0 connects altogether with the control terminal of first switching element PM0 and the input terminal of low-pass filter 102a, low pass filtered
The output terminal of ripple device 102a is connected with the control terminal of second switch element PM1, and the output terminal of second switch element PM1 is mirror image mould
The output terminal of block 102.
When it is implemented, first switching element PM0 and second switch element PM1 is realized using N-type MOS transistor, the P
The grid of type MOS transistor, source electrode and drain electrode be respectively first switching element PM0 and second switch element PM1 control terminal,
Input terminal and output terminal；It should be noted that in the utility model other embodiment, first switching element PM0 and second
The realization of other switching devices, such as p-type triode etc. can also be used in switch element PM1.
Further, as one preferred embodiment of the utility model, as shown in Fig. 2, voltage regulator module 101 includes：
Partial pressure unit 101a, amplifying unit 101b and switch unit 101c.
Wherein, the input terminal of partial pressure unit 101a and the input terminal of switch unit 101c connect to form voltage regulator module altogether
101 first input end, the output terminal of partial pressure unit 101a are connected with the first input end of amplifying unit 101b, amplifying unit
The second input terminal of 101b be voltage regulator module 101 the second input terminal, the output terminal and switch unit of amplifying unit 101b
The control terminal connection of 101c, the output terminal of switch unit 101c are the output terminal of voltage regulator module 101.
Specifically, partial pressure unit 101a divides supply voltage Vrg, to generate branch pressure voltage Vfb；Amplifying unit
101b carries out voltage stabilizing and noise reduction according to branch pressure voltage Vfb and reference voltage Vref control switch unit 101c to supply voltage Vrg
Processing.
Further, as one preferred embodiment of the utility model, as described in Figure 3, voltage regulator module 101 further includes
Reference voltage generating circuit 101d, reference voltage generating circuit 101d are specific to tie mainly for generation of reference voltage Vref
Structure and operation principle can refer to existing reference voltage circuit, and details are not described herein again.
Further, as one preferred embodiment of the utility model, as shown in figure 3, partial pressure unit 101a includes：First
Divider resistance R1 and the second divider resistance R2.
Wherein, the first end of the first divider resistance R1 is the input terminal of partial pressure unit 101a, the of the first divider resistance R1
The second end of two ends and the second divider resistance R2 connect the output terminal to form partial pressure unit 101a altogether, and the second of the second divider resistance R2
End ground connection.
Further, as one preferred embodiment of the utility model, as shown in figure 3, amplifying unit 101b includes amplification
The negative-phase input of device AP, amplifier AP are the first input end of amplifying unit 101b, and the normal phase input end of amplifier AP is to put
The second input terminal of big unit 101b, the output terminal of amplifier AP are the output terminal of amplifying unit 101b.
Further, as one preferred embodiment of the utility model, as shown in figure 3, switch unit 101c includes the 3rd
The control terminal of switch element PM2, the 3rd switch element PM2 are the control terminal of switch unit 101c, and the 3rd switch element PM2's is defeated
Enter input terminal of the end for switch unit 101c, the output terminal of the 3rd switch element PM2 is the output terminal of switch unit 101c.
When it is implemented, the 3rd switch element PM2 is realized using N-type MOS transistor, the grid of the N-type MOS transistor,
Source electrode and drain electrode are respectively control terminal, input terminal and the output terminal of the 3rd switch element PM2；It should be noted that at this
In utility model other embodiment, the realization of other switching devices, such as p-type triode etc. can also be used in the 3rd switch element PM2.
Further, as one preferred embodiment of the utility model, as shown in figure 3, power module 103 includes：4th
Switch element PM3 and the 5th switch element PM4.
Wherein, the input terminal of the 4th switch element PM3 and the input terminal of the 5th switch element PM4 connect to form power module altogether
103 the second input terminal, the output terminal of the 4th switch element PM3 is the first input end of power module 103, and the 4th switchs
The control terminal of element PM3 connects altogether with the output terminal of the 4th switch element PM3 and the control terminal of the 5th switch element PM4, and the 5th
The output terminal of switch element PM4 is the output terminal of power module 103.
When it is implemented, the 4th switch element PM3 and the 5th switch element PM4 are realized using N-type MOS transistor, the P
The grid of type MOS transistor, source electrode and drain electrode be respectively the 4th switch element PM3 and the 5th switch element PM4 control terminal,
Input terminal and output terminal；It should be noted that in the utility model other embodiment, the 4th switch element PM3 and the 5th
The realization of other switching devices, such as p-type triode etc. can also be used in switch element PM4.
Have below by taking circuit shown in Fig. 3 as an example to the operation principle work of voltage controlled oscillator 10 provided by the utility model
Body illustrates that details are as follows：
As shown in figure 3, a control source as voltage controlled oscillator 10, control voltage Vctrl is inputted to voltage and current
After modular converter 100, Voltage to current transducer module 100 exports two-way electric current according to according to control voltage Vctrl, all the way electric current
For the first electric current I0, another way electric current is the second electric current I1, and public affairs can be respectively adopted in the first electric current I0 and the second electric current I1
Formula (1), (2) are indicated, specifically：
I0=KV_I0*Vctrl (1)；
I1=KV_I1*Vctrl (2)；
Wherein, I0For the current value of the first electric current I0, the voltage value of Vctrl voltage Vctrl in order to control, KV_I0For voltage electricity
Transformation ratio of the modular converter 100 when voltage Vctrl will be controlled to be converted to the first electric current I0 is flowed, can be set as needed
It puts；I1For the current value of the second electric current I1, KV_I1Voltage Vctrl will controlled to be converted to second for Voltage to current transducer module 100
Transformation ratio during electric current I1 can be configured as needed.
After Voltage to current transducer module 100 exports the first electric current I0, first switching element PM0 is first electric current I0's
Under effect its grid generate a voltage Vg0, the relation between voltage Vg0 and the first electric current I0 can be used formula (3) into
Row represents；Wherein, Gm0 be first switching element PM0 mutual conductance, Vg0For the voltage value of voltage Vg0.
Inputs of the voltage Vg0 as low-pass filter 102a, the output voltage after by low-pass filter 102a
Vg1, voltage Vg1 eliminate alternating component and spike noise signal, and voltage Vg1 and voltage Vg0 compared to voltage Vg0
Relation can be indicated by formula (4)；Wherein, Vg1 is the voltage value of voltage Vg1, and Hlpf is the increasing of low-pass filter 102a
Benefit value.
Vg1=Vg0*Hlpf (4)；
Grid voltages of the voltage Vg1 as the control voltage, i.e. second switch element PM2 of second switch element PM1 so that
Second switch element PM1 exports the 4th electric current I2 under the action of voltage Vg1, and the 4th electric current I2 is second switch element
The electric current generated in PM1 raceway grooves, and the relation of the 4th electric current I2 and voltage Vg1 may be employed formula (5) and be indicated；Its
In, I2For the current value of the 4th electric current I2, Gm1 is the mutual conductance of second switch element PM1.
I2=Vg1*Gm1 (5)；
Aggregative formula (1), formula (2), formula (3), formula (4) and formula (5) can obtain the 4th electric current I2 and control
The relation of voltage Vctrl processed can be used formula (6) and be indicated.
From formula (6) as can be seen that the 4th electric current I2 of second switch element PM1 outputs is with controlling voltage Vctrl into one
Certainty ratio.
After Voltage to current transducer module 100 exports the second electric current I1, the electric current that the 4th switch element PM3 flows through is to be somebody's turn to do
Second electric current I1, and the second electric current I1 that the 5th switch element PM4 is flowed through according to the 4th switch element PM3 generates the 3rd electric current
I4, the 3rd electric current I4 are the channel current of the 5th switch element PM4, and formula (7) can be used with the relation of the second electric current I1
It is indicated；Wherein, I4For the current value of the 3rd electric current I4, I1For the current value of the second electric current I1, Gm4 is the 5th switch element
The mutual conductance of PM4, Gm3 are the mutual conductance of the 4th switch element PM3.
Understand that the expression formula of the 3rd electric current I4 can be used formula (8) and be indicated with reference to formula (2) and formula (7).
It is understood with reference to Fig. 3 and formula (6) and formula (8), appropriate settingValue withValue, can cause the 4th electric current I2 be more than electric current I5, the second electric current I1 and the 3rd electric current I4 summation, and
And in divider resistance R1, divider resistance R0, amplifier AP and and the 3rd switch element PM2 compositions feedback control loop effect
Under, the 4th electric current I2 and electric current I5, electric current I3, the second electric current I1 and the 3rd electric current I4 reach a balance, so that pressure
Control oscillator 10 can work normally.
In addition, inputs of the 3rd electric current I4 as ring oscillator 104, when ring oscillator 104 is operating voltage Vro's
Under effect during work, ring oscillator 104 can be adjusted the frequency of the clock signal Clock of output according to the 3rd electric current I4
Section so that the frequency that ring oscillator 104 exports can meet the needs of voltage controlled oscillator 10, and then meet the requirement of phaselocked loop,
Specific adjusting process can refer to formula (9)；Wherein, fclockFor the frequency of clock signal Clock, KICOFor frequency current gain.
fclock=KICO*I4 (9)；
Referring again to Fig. 3, from figure 3, it can be seen that when second switch element PM1 exports the under voltage Vg1 effects
After four electric current I2, the drain electrode of the second switch element PM1 out-put supply electricity under the action of the 4th electric current I2 and supply voltage VDD
Press Vrg.
In order to ensure that second switch element PM1 is worked normally, the source-drain electrodes of second switch element PM1 need a voltage
Vds_PM1, the voltage need the saturation voltage Vdsat_PM1 more than second switch element PM1, ensure second switch element with this
The drain electrode of PM1 has higher output impedance.Since saturation voltage Vdsat_PM1 is a fractional value, such as 100mV, therefore,
The source-drain electrode pressure drop of second switch element PM1 has smaller advantage, i.e. so that supply voltage Vrg and supply voltage VDD it
Between difference very little, big burden so will not be brought to the ceiling effect (headroom) of supply voltage VDD, can effectively be protected
Card voltage controlled oscillator 10 supply voltage VDD than it is relatively low when work.
Further, reference voltage generating circuit 101d output reference voltages Vref.The reference voltage Vref is amplifier
The negative input of AP, and the input of the positive of amplifier AP divides supply voltage Vrg for the first divider resistance R0 and second resistance R2
Press obtained branch pressure voltage Vfb.Since amplifier AP works when reference voltage Vref is equal to branch pressure voltage Vfb, when
When reference voltage Vref is equal to branch pressure voltage Vfb, the exportable control signals of amplifier AP control the 3rd switch element PM2, so as to
So that the 3rd switch element PM2 carries out voltage stabilizing to supply voltage Vrg.
Further, since branch pressure voltage Vfb divides gained for the first divider resistance R0 and second resistance R2 to supply voltage Vrg
The voltage arrived, therefore, when reference voltage Vref is equal to branch pressure voltage Vfb, supply voltage Vrg can be used formula (10) and carry out table
Show；Wherein, Vrg_DCFor the voltage value of supply voltage Vrg, VrefFor the voltage value of reference voltage Vref, R1 is the second divider resistance
The resistance value of R1, R0 are the resistance value of the first divider resistance R0.
From formula (10) and Fig. 3 can be seen that supply voltage Vrg in the second divider resistance R1, the first divider resistance R0, put
Under the action of the feedback control loop of big device AP and the 3rd switch element PM2 compositions, a low-resistance node, the voltage of the node are formed
Vrg can keep stablizing under the action of feedback control loop.
Further, due to containing noise signal in supply voltage VDD, in order to enable the noise signal is to voltage controlled oscillator
10 without influence, and the node therefore, it is necessary to the operating voltage Vro of ring oscillator 104 has a stronger power supply rejection ability, and by
It is obtained in the operating voltage Vro of ring oscillator 104 according to supply voltage Vrg, it therefore, can be according to supply voltage Vrg
The power supply rejection ability of node is derived and illustrated to the power supply rejection ability of operating voltage Vro nodes.
Specifically, as shown in figure 3, supply voltage Vrg voltage node, the impedance seen into power supply direction is denoted as
Ri1 is denoted as Ri2 to place to the impedance seen into；And in the voltage node of operating voltage Vro, will be seen into power supply direction
Impedance be denoted as Ri3, be denoted as Ri4 to place to the impedance seen into.According to circuit shown in Fig. 3, supply voltage vrg's
The power supply rejection ratio of voltage node is：
Wherein, PSRRVrgFor the power supply rejection ratio value of the voltage node of supply voltage Vrg, Ri1 is the value of impedance Ri1, Ri2
For the value of impedance Ri2, and since usual Ri1 is much larger than Ri2, the power supply rejection ratio of the voltage node of supply voltage Vrg
It can be represented by formula (12).
In addition, according to circuit shown in Fig. 3, the power supply rejection ratio of the voltage node of operating voltage Vro is：
Wherein, Ri4 is the value of impedance Ri4, and Ri3 is the value of impedance Ri3, and the sum of Ri3 and Ri4 are much larger than Ri2, Ri3
Much larger than Ri4.
Further, the value Ro1 of drain saturation resistances of the value Ri1 of impedance Ri1 equal to second switch element PM1, impedance
The value Ri4 of the value Ro4 of drain saturation resistances of the value Ri3 of Ri3 equal to the 5th switch element PM4, impedance Ri4 are equal to ring oscillation
The value Rosc of the equivalent input impedance of device 104, and the value Ri2 of impedance Ri2 can refer to the process of being calculated as below.
Specifically, as shown in figure 4, the voltage node in supply voltage Vrg is equivalent to one voltage source of application, the voltage source
Voltage change for Δ V, curent change is Δ I, thenWherein, Δ V is voltage change, and Δ I is curent change
Value, and due toWherein,
Gop is the value of the gain G op of amplifier AP, thenBy Ri1, Ri2, Ri3 and
The expression formula of Ri4, which substitutes into formula (13), can obtain formula (14)：
Since the gain of amplifier AP keeps a constant gain in bandwidth, when frequency is higher than bandwidth,
Gain can reduce, and therefore, when frequency is than relatively low, then the value Gop of the gain G op of amplifier AP is bigger, at this time
It is far longer than 1, then：
When the value Gop of the gain G op of amplifier AP is continuously decreased, until Gop is 0, then：
Since gm2*Ro1*Ro4 is a bigger value, and Rosc is a smaller value, therefore, from formula
(15) and formula (16) is as can be seen that the voltage node of operating voltage Vro still can keep smaller power supply rejection ratio, and
Since power supply rejection ratio refers to early noise noise gain caused by a certain voltage node of power supply voltage, it should
It is worth smaller, shows that the power supply rejection ability of voltage node is better, that is to say, that no matter frequency height, provided by the utility model
Voltage controlled oscillator 10 all has good power supply rejection ability.
Further, the utility model additionally provides a kind of phaselocked loop, which includes voltage controlled oscillator 10.It needs
It is bright, the voltage controlled oscillator 10 of the phaselocked loop provided by the utility model embodiment and Fig. 1 to Fig. 4 voltage controlled oscillation
Device 10 is identical, and therefore, the concrete operating principle of the voltage controlled oscillator 10 in the phaselocked loop that the utility model embodiment is provided can
With reference to the detailed description previously with regard to Fig. 1 to Fig. 4, details are not described herein again.
In the utility model, by using including Voltage to current transducer module, voltage regulator module, mirror module, electricity
The voltage controlled oscillator of source module and ring oscillator so that Voltage to current transducer module is according to control the first electric current of voltage output
With the second electric current, mirror module generates the difference of supply voltage, supply voltage and supply voltage according to the first electric current and supply voltage
Value is less than predetermined threshold value, and voltage regulator module carries out voltage stabilizing and noise reduction process, power module according to reference voltage to supply voltage
3rd electric current is generated according to the second electric current, and supply voltage provides operating voltage to ring oscillator according to treated, so as to
Ring oscillator under the action of operating voltage according to the frequency of the 3rd current control clock signal, due to the work of ring oscillator
It is obtained as voltage according to supply voltage, and supply voltage can also be kept steady when larger fluctuation occurs for supply voltage
It is fixed, and when supply voltage is smaller, power supply power supply can also ensure that ring oscillator works, therefore, provided by the utility model
Voltage controlled oscillator can work under low suppling voltage, and with big band wide power rejection ability.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of voltage controlled oscillator, which is characterized in that the voltage controlled oscillator includes：
Voltage to current transducer module, voltage regulator module, mirror module, power module and ring oscillator；
The input terminal of the Voltage to current transducer module receives control voltage, the first output terminal of the Voltage to current transducer module
It is connected with the first input end of the mirror module, second output terminal and the power module of the Voltage to current transducer module
First input end connection, the second input terminal of the mirror module receives supply voltage, the output terminal of the mirror module with
Second input terminal of the first input end of the voltage regulator module and the power module connects altogether, the voltage regulator module
The second input terminal receive reference voltage, the output head grounding of the voltage regulator module, the output terminal of the power module with
The input terminal connection of the ring oscillator, the output terminal output clock signal of the ring oscillator；
The Voltage to current transducer module is according to control first electric current of voltage output and the second electric current；The mirror module root
Supply voltage is generated according to first electric current and the supply voltage, the difference of the supply voltage and the supply voltage is less than
Predetermined threshold value；The voltage regulator module carries out voltage stabilizing and noise reduction process according to the reference voltage to the supply voltage；Institute
It states power module and receives second electric current, the 3rd electric current is generated according to second electric current, and power supply is electric according to treated
Pressure generation operating voltage, and the operating voltage is exported to the ring oscillator, the ring oscillator is in the work
Work under the action of voltage, and according to the 3rd current control clock signal frequency.
2. voltage controlled oscillator according to claim 1, which is characterized in that the mirror module includes：
First switching element, low-pass filter and second switch element；
The input terminal of the first switching element and the input terminal of the second switch element connect to form the mirror module altogether
Second input terminal, the output terminal of the first switching element is the first input end of the mirror module, and described first opens
The output terminal for closing element connects altogether with the control terminal of the first switching element and the input terminal of the low-pass filter, described low
The output terminal of bandpass filter is connected with the control terminal of the second switch element, and the output terminal of the second switch element is described
The output terminal of mirror module.
3. voltage controlled oscillator according to claim 2, which is characterized in that the first switching element and the second switch
Element is N-type MOS transistor.
4. voltage controlled oscillator according to claim 1, which is characterized in that the voltage regulator module includes：
Partial pressure unit, amplifying unit and switch unit；
The input terminal of the partial pressure unit and the input terminal of the switch unit connect to form the first of the voltage regulator module altogether
Input terminal, the output terminal of the partial pressure unit are connected with the first input end of the amplifying unit, and the second of the amplifying unit
Input terminal is the second input terminal of the voltage regulator module, the control of the output terminal of the amplifying unit and the switch unit
End connection, the output terminal of the switch unit are the output terminal of the voltage regulator module；
The partial pressure unit divides the supply voltage, to generate branch pressure voltage；The amplifying unit is according to described point
Piezoelectricity is pressed controls the switch unit to carry out voltage stabilizing and noise reduction process to the supply voltage with the reference voltage.
5. voltage controlled oscillator according to claim 4, which is characterized in that the partial pressure unit includes：
First divider resistance and the second divider resistance；
The first end of first divider resistance be the partial pressure unit input terminal, the second end of first divider resistance with
The second end of second divider resistance connects the output terminal to form the partial pressure unit, the second end of second divider resistance altogether
Ground connection.
6. voltage controlled oscillator according to claim 4, which is characterized in that the amplifying unit includes amplifier, described to put
The negative-phase input of big device is the first input end of the amplifying unit, and the normal phase input end of the amplifier is single for the amplification
Second input terminal of member, the output terminal of the amplifier are the output terminal of the amplifying unit.
7. voltage controlled oscillator according to claim 4, which is characterized in that the switch unit includes the 3rd switch element,
The control terminal of 3rd switch element is the control terminal of the switch unit, and the input terminal of the 3rd switch element is described
The input terminal of switch unit, the output terminal of the 3rd switch element are the output terminal of the switch unit.
8. voltage controlled oscillator according to claim 7, which is characterized in that the 3rd switch element is p-type MOS crystal
Pipe.
9. voltage controlled oscillator according to claim 1, which is characterized in that the power module includes：
4th switch element and the 5th switch element；
The input terminal of 4th switch element connects to form the power module altogether with the input terminal of the 5th switch element
Second input terminal, the output terminal of the 4th switch element is the first input end of the power module, and the described 4th opens
The control terminal for closing element connects altogether with the output terminal of the 4th switch element and the control terminal of the 5th switch element, described
The output terminal of 5th switch element is the output terminal of the power module.
10. a kind of phaselocked loop, which is characterized in that the phaselocked loop includes voltage controlled oscillation as described in any one of claim 1 to 9
Device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721875381.3U CN207427122U (en) | 2017-12-28 | 2017-12-28 | A kind of phaselocked loop and its voltage controlled oscillator |
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| CN201721875381.3U CN207427122U (en) | 2017-12-28 | 2017-12-28 | A kind of phaselocked loop and its voltage controlled oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979371A (en) * | 2017-12-28 | 2018-05-01 | 上海先基半导体科技有限公司 | A kind of phaselocked loop and its voltage controlled oscillator |
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2017
- 2017-12-28 CN CN201721875381.3U patent/CN207427122U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979371A (en) * | 2017-12-28 | 2018-05-01 | 上海先基半导体科技有限公司 | A kind of phaselocked loop and its voltage controlled oscillator |
| CN107979371B (en) * | 2017-12-28 | 2024-03-22 | 上海先基半导体科技有限公司 | Phase-locked loop and voltage-controlled oscillator thereof |
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