CN104320134B - The frequency generating circuit of quick lock in - Google Patents
The frequency generating circuit of quick lock in Download PDFInfo
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- CN104320134B CN104320134B CN201410581688.7A CN201410581688A CN104320134B CN 104320134 B CN104320134 B CN 104320134B CN 201410581688 A CN201410581688 A CN 201410581688A CN 104320134 B CN104320134 B CN 104320134B
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Abstract
The invention discloses a kind of frequency generating circuit of quick lock in, the circuit includes phase-locked loop circuit, voltage controlled oscillator, the reference frequency source for being used to provide reference frequency being connected with the phase-locked loop circuit, main control chip for configuring phase-locked loop frequency and output control signal, also include the broadband loop filter circuit being connected between the phase-locked loop circuit and the voltage controlled oscillator, it is connected to the narrow band loop filter circuit between the phase-locked loop circuit and the voltage controlled oscillator, being connected to being used between the broadband loop filter circuit and the narrow band loop filter circuit follows to ensure control circuit that the broadband loop filter circuit is consistent with the narrow band loop filter circuit voltage.When upper electric, the frequency generating circuit is by controlling circuit to ensure that broadband loop filter circuit keeps voltage identical with narrow band loop filter circuit, to reach the purpose of fast lock phase-locked loop.
Description
Technical field
The present invention relates to field of radio frequency communication, more particularly to a kind of frequency generating circuit of quick lock in.
Background technology
Frequency generating units are particularly significant in Modern Communication System and information processing system.It serves not only as radio communication
The local oscillations source of system transreceiver and the clock source of digital signal processor, and its performance indications directly determine be
The performance indications of system.At present, in wireless and mobile communication application, with the raising of data transmission bauds, frequency generating units
Locking time increasingly become one of key index of design.Locking time is shorter, then frequency conversion speed is faster, and data are passed
Defeated speed is also faster.
Obtain high accuracy, the local frequency of low phase noise, it is necessary to using the method for Phase locking frequency synthesis, but lock phase frequency
Rate synthetic method is a phase degeneration factor, there is the intrinsic feedback procedure moved in circles, and locking time is longer, moreover,
The requirement of locking time and phase noise to loop bandwidth is conflicting：Accelerate lock speed, the bandwidth of phase-locked loop
It is more wide better；Phase noise and burr are reduced, then the bandwidth of loop is more narrow better.Modern wireless communication is to these two aspects performance
It is required that all extremely harsh.
Fig. 1 is the oscillogram of phase lock loop locks in the prior art, and the process of Frequency Locking is introduced below in conjunction with accompanying drawing 1.
1) T1 stages-acquisition phase：Due to the switching of frequency, frequency is from unstable drastically change is stabilized to, and output is frequently
Rate is very big with reference frequency phase difference, and phaselocked loop is in out-of-lock condition, it is necessary to which substantial amounts of pump electric current captures target frequency.
2) T2 stages-tracking phase：Output frequency and reference frequency phase difference are smaller, phaselocked loop to output frequency carry out with
Track, belongs to the stage of loop itself regulation.
3) T3 stages-stabilization sub stage：Output frequency is very small with reference frequency phase difference, and phaselocked loop is in the shape of locking
State.For example, in private network communication, when frequency departure is less than ± 100Hz, phaselocked loop enters stable state.
As shown in figure 1, in the three phases of locking process, when mainly by determining the locking of target frequency in T1 the and T2 stages
Between.And T2 time determines mainly due to the parameter of loop itself.During T2, phase difference is smaller, by phaselocked loop certainly
The regulation of body can enter T3 quickly.However, there is direct shadow the time that T1 acquisition phases are consumed to the integral locking time
Ring.
Improving the method for locking time and reduction phase noise in the prior art has following several：(1) by giving sequential control
System starts each frequency source in phase-locked loop circuit；Reduce influence of the overshoot to locking time；But its insertion switch is more, and SECO is multiple
It is miscellaneous, it is impossible to weigh and reduce a path filter optimum start-up timing scheme.(2) by the preset voltage-controlled voltage of loop filter with reality
Existing quick lock in, according to the preset voltage-controlled voltage of frequency, can effectively reduce pull-in time, accelerate locking, but can not realize phase
The raising of noise, and hsrdware requirements are more, can consume more electric current.(3) change loop bandwidth, i.e., increase in locking process
Big loop bandwidth, reduces loop bandwidth and is filtered with meeting after the phase of frequency generating units is made an uproar by DAC to narrow band loop after locking
Wave circuit is configured, and software, which is read, in this method needs the time, and can not be configured in real time, takes a large amount of internal memories, meanwhile, with
Other software operation can not be carried out during putting.
The content of the invention
The technical problem to be solved in the present invention is, for the defect of prior art, there is provided a kind of frequency of quick lock in
Generation circuit.
The technical solution adopted for the present invention to solve the technical problems is：A kind of frequency generating circuit of quick lock in, bag
Include phase-locked loop circuit, voltage controlled oscillator, be connected with the phase-locked loop circuit be used for provide reference frequency reference frequency source, use
In configuration phase-locked loop frequency and the main control chip of output control signal, it is characterised in that：Also include being connected to the phaselocked loop electricity
Broadband loop filter circuit between road and the voltage controlled oscillator, it is connected to the phase-locked loop circuit and the voltage controlled oscillator
Between narrow band loop filter circuit, be connected between the broadband loop filter circuit and the narrow band loop filter circuit
For realizing voltage follow to ensure control that the broadband loop filter circuit is consistent with the narrow band loop filter circuit voltage
Circuit processed；
The main control chip is filtered with the phase-locked loop circuit, the broadband loop filter circuit, the narrow band loop respectively
Wave circuit is connected with the control circuit；The main control chip output control signal is to switch broadband loop filter circuit or arrowband
Loop filter circuit is connected with the phase-locked loop circuit, and by controlling the control circuit to make the broadband loop filter circuit
It is consistent with narrow band loop filter circuit voltage.
During phase lock loop locks, if being carried out by broadband loop filter circuit in quick lock in, locking process, arrowband
The voltage of the voltage follow broadband loop filter circuit of loop filter circuit, is waited after the locking of broadband loop filter circuit, arrowband ring
The voltage transient of road filter circuit reaches stabilization, by main control chip output control signal, switches to narrow band loop filter circuit
It is connected between phase-locked loop circuit and voltage controlled oscillator, because the voltage of narrow band loop filter circuit is broadband loop filter circuit
Circuit, error is only the error voltage that operational amplifier realizes Following effect, and error voltage is minimum, therefore can realize fast lock
It is fixed.
Preferably, the control circuit includes being used to realize that signal follows operational amplifier, is connected to the broadband loop
Second switch and the connection narrow band loop filter circuit and the computing between filter circuit and the operational amplifier
The 3rd switch between amplifier；The second switch and the 3rd switch are connected with the main control chip and according to described
The conducting direction of the control signal controlling switch of main control chip output, to realize the broadband loop filter circuit and the arrowband
Loop filter circuit is two-way to be followed.
Preferably, the conducting direction of the control signal controlling switch exported according to the main control chip, to realize
State broadband loop filter circuit and the narrow band loop filter circuit it is two-way follow including：The broadband loop filter circuit with
During the phase-locked loop circuit connection, the conducting direction of control second switch and the 3rd switch so that the broadband loop filtered electrical
The voltage signal of road output flows to the narrow band loop filter circuit by second switch, operational amplifier and the 3rd switch, with
Realize the voltage of broadband loop filter circuit described in the voltage follow of the narrow band loop filter circuit；
Or when the narrow band loop filter circuit is connected with the phase-locked loop circuit, control second switch and the 3rd is opened
The conducting direction of pass so that the voltage signal of narrow band loop filter circuit output by the 3rd switch, operational amplifier and
Second switch flows to the broadband loop filter circuit, to realize arrowband described in the voltage follow of the broadband loop filter circuit
The voltage of loop filter circuit.
Preferably, the second switch and the 3rd switch are single-pole double-throw switch (SPDT), DPDT or at least two lists
The combination of monopole single throw switch.
Preferably, the control circuit with the broadband loop filter circuit including being connected for realizing what signal was followed
Operational amplifier, the 4th switch for being connected to the operational amplifier and the narrow band loop filter circuit；4th switch
The break-make for the control signal controlling switch for being connected with the main control chip and being exported according to the main control chip；In the wide band loop
When road filter circuit is connected with the phase-locked loop circuit, the 4th switch conduction, the broadband loop filter circuit output
Voltage signal flows through the operational amplifier and flows to the narrow band loop filter circuit with the 4th switch, described narrow to realize
The voltage of broadband loop filter circuit described in voltage follow with loop filter circuit；And the narrow band loop filter circuit with
During the phase-locked loop circuit connection, the described 4th switches off.
Preferably, the 4th switch is single-pole double-throw switch (SPDT), double-point double-throw switch, single-pole single-throw switch (SPST) or one-way conduction
Switch.
Preferably, in addition to be connected between the phase-locked loop circuit and the voltage controlled oscillator be used for filter out voltage-controlled shake
Swing the feedback circuit of device harmonic wave.
Preferably, in addition to for switch the broadband loop filter circuit or the narrow band loop filter circuit with it is described
The first switch of phase-locked loop circuit connection, for switch the broadband loop filter circuit or the narrow band loop filter circuit with
5th switch of the voltage controlled oscillator connection；The first switch and the 5th switch are connected and root with the main control chip
The break-make of the control signal controlling switch exported according to the main control chip.
Preferably, the first switch, the 5th switch are single-pole double-throw switch (SPDT), DPDT or at least two hilted broadswords
The combination of single-throw switch.
The present invention has the following advantages that compared with prior art：Implement the present invention, by the broadband loop filtered electrical
Road and the narrow band loop filter circuit be provided for realizing voltage follow with ensure the broadband loop filter circuit with it is described
The control circuit of narrow band loop filter circuit voltage unanimously, during ensureing upper electric, broadband loop filter circuit is filtered with narrow band loop
Wave circuit keeps voltage identical, to reach the purpose of fast lock phase-locked loop, while switching broadband loop filtering can be reduced effectively
Phase noise during circuit or narrow band loop filter circuit.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the waveform diagram of phase lock loop locks in the prior art.
Fig. 2 is the schematic diagram of the frequency generating circuit of quick lock in the embodiment of the present invention 1.
Fig. 3 is the circuit diagram of the frequency generating circuit of quick lock in the embodiment of the present invention 1.
Fig. 4 is the schematic diagram of the frequency generating circuit of quick lock in the embodiment of the present invention 2.
Fig. 5 is the circuit diagram of the frequency generating circuit of quick lock in the embodiment of the present invention 2.
In figure：11st, phase-locked loop circuit；12nd, voltage controlled oscillator；13rd, broadband loop filter circuit；14th, narrow band loop is filtered
Circuit；15th, first switch；16th, circuit is controlled；161st, operational amplifier；162nd, second switch；163rd, the 3rd switch；164th,
Four switches；17th, the 5th switch；18th, feedback circuit；19th, reference frequency source；20th, main control chip.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now compare accompanying drawing and describe in detail
The embodiment of the present invention.
Embodiment 1
Fig. 2 shows the frequency generating circuit of the quick lock in the present embodiment.The frequency generating circuit of the quick lock in, bag
The reference frequency source for being used to provide reference frequency for include phase-locked loop circuit 11, voltage controlled oscillator 12, being connected with phase-locked loop circuit 11
19th, for configuring the main control chip 20 of phase-locked loop frequency and output control signal；Also include being connected to phase-locked loop circuit 11 and institute
State the broadband loop filter circuit 13 between voltage controlled oscillator 12, be connected between phase-locked loop circuit 11 and voltage controlled oscillator 12
Narrow band loop filter circuit 14, be connected between broadband loop filter circuit 13 and narrow band loop filter circuit 14 be used for realize
Voltage follow is to ensure control circuit 16 that broadband loop filter circuit 13 is consistent with the voltage of narrow band loop filter circuit 14.Specifically
Ground, main control chip 20 is electric with phase-locked loop circuit 11, broadband loop filter circuit 13, narrow band loop filter circuit 14 and control respectively
Road 16 is connected.The output control signal of main control chip 20 switching broadband loop filter circuit 13 or narrow band loop filter circuit 14 and lock
Phase loop circuit 11 is connected, and makes narrow band loop filter circuit 14 and the electricity of broadband loop filter circuit 13 by control circuit 16
Pressure is consistent, to reach the purpose of fast lock phase-locked loop, while broadband loop filter circuit 13 and narrow band loop can be reduced effectively
Phase noise in the handoff procedure of filter circuit 14.
The frequency generating circuit of the quick lock in is during phase lock loop locks, if main control chip 20 is according to system index
(i.e. user's request) output control information by broadband loop filter circuit 13 to be first connected to phase-locked loop circuit 11 and VCO
Between device 12, carried out by broadband loop filter circuit 13 in quick lock in, locking process, by controlling the accordingly control of circuit 16
The voltage of the voltage follow broadband loop filter circuit 13 of narrow band loop filter circuit 14, treats that broadband loop filter circuit 13 is locked
Afterwards, the voltage transient of narrow band loop filter circuit 14 reaches stabilization, the control signal exported according to main control chip 20, switches to narrow
When band loop filter circuit 14 is connected between phase-locked loop circuit 11 and voltage controlled oscillator 12, due to narrow band loop filter circuit 14
Voltage be broadband loop filter circuit 13 circuit, error is only the error voltage that operational amplifier 161 realizes Following effect,
Error voltage is minimum, therefore can realize quick lock in；Vice versa.
Specifically, the frequency generating circuit of the quick lock in also includes being connected to phase-locked loop circuit 11 and voltage controlled oscillator 12
Between be used for filter out the feedback circuit 18 of the harmonic wave of voltage controlled oscillator 12；It is to be appreciated that the feedback that voltage controlled oscillator 12 is exported
Frequency is inputted to phase-locked loop circuit 11 through feedback circuit 18, and phase-locked loop circuit 11 compares feedback frequency and reference frequency, exports phase
Potential difference, if phase difference is smaller, lock-in circuit, and can effectively reduce phase difference.
Specifically, the frequency generating circuit of the quick lock in also includes being used to switch broadband loop filter circuit 13 or arrowband
First switch 15 that loop filter circuit 14 is connected with phase-locked loop circuit 11, for switching broadband loop filter circuit 13 or arrowband
The 5th switch 17 that loop filter circuit 14 is connected with voltage controlled oscillator 12；The switch of first switch 15 and the 5th 17 and main control chip
The break-make of the 20 control signal controlling switches for being connected and being exported according to main control chip 20.
As shown in Fig. 2 control circuit 16 includes being used to realize that signal follows operational amplifier 161, is connected to broadband loop
Second switch 162 and connection narrow band loop filter circuit 14 between filter circuit 13 and operational amplifier 161 are put with computing
The 3rd switch 163 between big device 161.The switch of second switch 162 and the 3rd 163 is connected with main control chip 20 and according to master control core
The conducting direction for the control signal controlling switch that piece 20 is exported, to realize broadband loop filter circuit 13 and narrow band loop filtered electrical
Road 14 is two-way to be followed.
Specifically, when broadband loop filter circuit 13 is connected with phase-locked loop circuit 11, second switch 162 and the 3rd is controlled
The conducting direction of switch 163 so that the voltage signal that broadband loop filter circuit 13 is exported is put by second switch 162, computing
The big switch of device 161 and the 3rd 163 flows to narrow band loop filter circuit 14, to realize the voltage follow of narrow band loop filter circuit 14
The voltage of broadband loop filter circuit 13.Or when narrow band loop filter circuit 14 is connected with phase-locked loop circuit 11, control the
The conducting direction of two switches 162 and the 3rd switch 163 so that the voltage signal that narrow band loop filter circuit 14 is exported passes through the 3rd
Switch 163, operational amplifier 161 and second switch 162 flow to broadband loop filter circuit 13, to realize broadband loop filtered electrical
The voltage of the voltage follow narrow band loop filter circuit 14 on road 13.
Specifically, first switch 15, the switch 17 of the switch of second switch the 162, the 3rd 163 and the 5th can be opened for single-pole double throw
The combination of pass, DPDT or at least two single-pole single-throw switch (SPST)s, can also go up other can realize other of two-way admittance function
Switch.The control signal that main control chip 20 is exported in the present embodiment for low and high level signal or other be used for controlling switch break-make
Signal.As shown in figure 3, in the present embodiment, first switch 15 is that switch U6071, second switch 162 are switch U6076, the 3rd opened
Pass 163 is switch U6075 and the 5th switch is switch U6073, wherein, U6071, U6076, U6075 and U6073 are that hilted broadsword is double
Throw switch, including ground pin GND, voltage input pin VCC, signal input tube pin IN, public port pin COM, normally opened pipe
Pin NO, normally closed pin NC.When signal input tube pin IN receives the high level signal of the output of main control chip 20, public port pin
COM is connected with normally opened pin NO；When signal input tube pin IN receives the low level signal of the output of main control chip 20, public port
Pin COM is connected with normally closed pin NC.Specifically, first switch U6071, second switch U6076, the 3rd switch U6075 and the
Five switch U6073 signal input tube pin IN is respectively connected with filter circuit of pressure-stabilizing, and the filter circuit of pressure-stabilizing includes inputting with signal
Filter resistance R6070, R6099, R6095 or R6085 and one end connected pin IN is connected to filter resistance and signal is inputted
Electric capacity C6099, C6141, C6140 or C6142 of connecting node and other end ground connection between pin IN.First switch U6071,
Second switch U6076, the 3rd switch U6075 and the 5th switch U6073 voltage input pin VCC are connected with power supply circuit.Such as
Shown in Fig. 3, the 5V voltages of power supply circuit output are inputted to first switch to switching switch 5VA_Switch again by magnetic bead L6041
Two in parallel between U6071 voltage input pin VCC, magnetic bead L6041 and first switch U6071 voltage input pin VCC
Electric capacity C6138, C6135 of ground connection.It is to be appreciated that second switch U6076, the 3rd switch U6075 and the 5th switch U6073's
Voltage input pin VCC can receive identical power supply circuit.
As shown in figure 3, as first switch U6071, second switch U6076, the 3rd switch U6075 and the 5th switch U6073
Signal input tube pin IN receive main control chip 20 output high level signal after, public port pin COM and normally opened pin
NO is connected, and the pump electric current that phase-locked loop circuit 11 is exported flows through broadband loop filter circuit 13 by first switch U6071 and is converted into
Voltage signal, again by the 5th switch U6073 export to voltage controlled oscillator 12, to control the output frequency of voltage controlled oscillator 12；
The voltage signal that the pump electric current that phase-locked loop circuit 11 is exported is converted into by broadband loop filter circuit 13 is also by second switch
U6076 is inputted to operational amplifier 161U6072 the 5th pin, then by the 7th pin input to the 3rd switch U6075 it is normally opened
Pin NO, then inputted by public port pin COM to narrow band loop filter circuit 14, under the use of operational amplifier 161,
Ensure that voltage holding is identical when narrow band loop filter circuit 14 switches with broadband loop filter circuit 13, reaches fast lock lock phase
The purpose of ring.It is to be appreciated that because the loop bandwidth of broadband loop filter circuit 13 is wider, its pump electric current is bigger；Pass through fortune
The Following effect of amplifier 161 is calculated, the voltage of narrow band loop filter circuit 14 and the electricity of narrow band loop filter circuit 14 can be achieved
Pressure is basically identical, after broadband loop filter circuit 13 switches to narrow band loop filter circuit 14, is substantially at the T2 stages；
And flowing through that the voltage of broadband loop filter circuit 13 is bigger, its loop bandwidth is wider, and the time in corresponding T1 stages is shorter, its
The time used is shorter in locking process, so as to reach the purpose of quick lock in.
The letter received as first switch U6071, second switch U6076, the 3rd switch U6075 and the 5th switch U6073
Number input pin IN is received after the low level signal of the output of main control chip 20, and public port pin COM and normally closed pin NC connect
Logical, the pump electric current that phase-locked loop circuit 11 is exported flows through narrow band loop filter circuit 14 by first switch U6071 and is converted into voltage
Signal, again by the 5th switch U6073 export to voltage controlled oscillator 12, to control the output frequency of voltage controlled oscillator 12；Lock phase
The voltage signal that the pump electric current that loop circuit 11 is exported is converted into by narrow band loop filter circuit 14 is also by the 3rd switch U6075
Input to operational amplifier 161U6072 the 3rd pin, then inputted by the 1st pin to second switch U6076 normally closed switch
NC, then inputted by public port pin COM to broadband loop filter circuit 13, with ensure broadband loop filter circuit 13 with it is narrow
Voltage keeps identical when band loop filter circuit 14 switches, and saves the time in T1 stages, reaches the purpose of fast lock phase-locked loop.
Specifically, broadband loop filter circuit 13 is connected another with first switch U6071 including one end by resistance R6073
The electric capacity C6134 for holding ground connection, the resistance R6069 and resistance that are connected between resistance R6073 and electric capacity C6134 connecting node
R6072, one end be connected with resistance R6069 the other end ground connection electric capacity C6100, one end be connected with resistance R6069 the other end be grounded
Electric capacity C6133, one end be connected with resistance C6072 the other end ground connection electric capacity C6136, one end be connected another with resistance C6072
Hold the electric capacity C6137 of ground connection.
Narrow band loop filter circuit 14 includes one end and first switch U6071 and is connected other end ground connection by resistance R6068
Electric capacity C6092, the resistance C6064 and resistance R6067, one that are connected between resistance R6068 and electric capacity C6092 connecting node
End be connected with resistance R6064 the other end be grounded electric capacity C6093, one end be connected with resistance R6064 the other end be grounded electric capacity
C6094, one end be connected with resistance R6067 the other end ground connection electric capacity C6097, one end be connected with resistance R6068 the other end be grounded
Electric capacity C6098.It is to be appreciated that the connection of broadband loop filter circuit 13 and the component of narrow band loop filter circuit 14 is closed
It is identical, it, which is distinguished, is in broadband loop filter circuit 13 that the capacitance of electric capacity and the resistance of resistance are filtered much larger than narrow band loop
The capacitance of electric capacity and the resistance of resistance in wave circuit 14, so that it is bigger by the pump electric current of broadband loop filter circuit 13, with
Distinguish broadband connections and narrow band communication.
In private network communication system, when device power or switching channel frequency, first judge it is broadband connections or arrowband
Communication, if broadband connections then exports high level signal by main control chip 20, is filtered using broadband loop, without switching；If
It is that narrow band communication then exports low level signal by main control chip 20, carrying out switch after the locking of broadband loop filter circuit 13 cuts
Change, switch to narrow band loop filter circuit 14, when upper electric, voltage and the broadband loop filter circuit of narrow band loop filter circuit 14
13 voltage is consistent substantially, therefore can reach the purpose of quick lock in.If during narrow band communication, in substantial amounts of information or
Image needs to handle transmission, can be switched fast as broadband loop filter circuit 13, due to the voltage of broadband loop filter circuit 13
Voltage with narrow band loop filter circuit 14 is basically identical, so as to reach the purpose of quick transmission image and information.
Embodiment 2
As shown in Figure 4, Figure 5, embodiment 2 and the difference of the frequency generating circuit of the quick lock in provided in embodiment 1
It is that both control circuits 16 are different.In the present embodiment, control circuit 16 includes what is be connected with broadband loop filter circuit 13
For realizing operational amplifier 161 that signal follows, being connected to operational amplifier 161 and the 4th of narrow band loop filter circuit 14
Switch 164.4th switchs the logical of the 164 control signal controlling switches for being connected with main control chip 20 and being exported according to main control chip 20
It is disconnected.Specifically, when broadband loop filter circuit 13 is connected with phase-locked loop circuit 11, the 4th switch 164 is turned on, broadband loop filter
The voltage signal that wave circuit 13 is exported flows through the switch of operational amplifier 161 and the 4th 164 and flows to narrow band loop filter circuit 14, with
Realize the voltage of the voltage follow broadband loop filter circuit 13 of narrow band loop filter circuit 14；And in narrow band loop filter circuit
14 with phase-locked loop circuit 11 when being connected, and the 4th switch 164 disconnects.
It is to be appreciated that the 4th switch 164 can for single-pole double-throw switch (SPDT), double-point double-throw switch, single-pole single-throw switch (SPST) or
Unidirectional conducting switch, can also be that other are switched.In the present embodiment, the control information that main control chip 20 is exported is believed for low and high level
Number, control mode signal is simple.
As shown in figure 5, the 4th switch 164 is switch U8009, the 4th switchs U8009 for unidirectional conducting switch, including ground connection
Pin GND, voltage input pin VCC, signal input tube pin Vin, signal output pin OUT, switch switching pin ON/OFF, when
Switch switching pin ON/OFF receives the high level signal of the output of main control chip 20, the 4th switch U8009 conductings；Receive master
The low level signal that chip 20 is exported is controlled, the 4th switch U8009 disconnects.
As shown in figure 5, when first switch U6071, the 4th switch U8009, the 5th switch U6073 receive main control chip 20
During the high level signal of output, the pump electric current that phase-locked loop circuit 11 is exported flows through broadband loop by first switch U6071 and filtered
Circuit 13 be converted into voltage signal, again by the 5th switch U6073 export to voltage controlled oscillator 12, to control voltage controlled oscillator 12
Output frequency；The voltage signal that the pump electric current that phase-locked loop circuit 11 is exported is converted into by broadband loop filter circuit 13 is exported
To operational amplifier 161U6072 the 3rd pin or the 5th pin, then pass through operational amplifier 161U6072 the 1st pin or the 7th
Pin is inputted to the 4th switch U8009 signal input tube pin Vin, and passes through the 4th switch U8009 signal output pin OUT
Input is to narrow band loop filter circuit 14, to realize that narrow band loop filter circuit 14 follows the mesh of broadband loop filter circuit 13
's.When first switch U6071, the 4th switch U8009, the 5th switch U6073 receive the low level letter of the output of main control chip 20
Number when, the pump electric current that phase-locked loop circuit 11 is exported flows through narrow band loop filter circuit 14 by first switch U6071 and is converted into electricity
Signal is pressed, then by exporting to voltage controlled oscillator 12, to control the output frequency of voltage controlled oscillator 12, to realize narrow band communication.
The present invention is illustrated by several specific embodiments, it will be appreciated by those skilled in the art that, do not departing from
In the case of the scope of the invention, various conversion and equivalent substitute can also be carried out to the present invention.In addition, for particular condition or tool
Body situation, can make various modifications, without departing from the scope of the present invention to the present invention.Therefore, the present invention is not limited to disclosed
Specific embodiment, and whole embodiments for falling within the scope of the appended claims should be included.
Claims (8)
1. a kind of frequency generating circuit of quick lock in, including phase-locked loop circuit (11), voltage controlled oscillator (12), with the lock phase
What loop circuit (11) was connected, which be used for, provides the reference frequency source (19) of reference frequency, for configuring phase-locked loop frequency and output control
The main control chip (20) of signal, it is characterised in that：Also include being connected to the phase-locked loop circuit (11) and the voltage controlled oscillator
(12) broadband loop filter circuit (13) between, be connected to the phase-locked loop circuit (11) and the voltage controlled oscillator (12) it
Between narrow band loop filter circuit (14), be connected to the broadband loop filter circuit (13) and the narrow band loop filter circuit
(14) being used between realizes voltage follow to ensure the broadband loop filter circuit (13) and the narrow band loop filtered electrical
The control circuit (16) of road (14) voltage unanimously；
The main control chip (20) respectively with the phase-locked loop circuit (11), the broadband loop filter circuit (13), described narrow
Band loop filter circuit (14) is connected with the control circuit (16)；Main control chip (20) output control signal is to switch width
Band loop filter circuit (13) or narrow band loop filter circuit (14) are connected with the phase-locked loop circuit (11), and by controlling
Stating control circuit (16) makes the broadband loop filter circuit (13) consistent with narrow band loop filter circuit (14) voltage；
During phase lock loop locks, if the main control chip (20) output control signal is first by the broadband loop filter circuit
(13) it is connected between the phase-locked loop circuit (11) and the voltage controlled oscillator (12), passes through the broadband loop filter circuit
(13) carry out in quick lock in, locking process, the narrow band loop filter circuit (14) is controlled by the control circuit (16)
Voltage follow described in broadband loop filter circuit (13) voltage, after the broadband loop filter circuit (13) lock after, institute
The voltage transient for stating narrow band loop filter circuit (14) is stable；
The control circuit (16) includes being used to realize that signal follows operational amplifier (161), is connected to the broadband loop filter
Second switch (162) between wave circuit (13) and the operational amplifier (161) and it is connected to the narrow band loop filtering
The 3rd switch (163) between circuit (14) and the operational amplifier (161)；The second switch (162) and the described 3rd
The control signal controlling switch that switch (163) is connected with the main control chip (20) and exported according to the main control chip (20)
Conducting direction, to realize the broadband loop filter circuit (13) and the narrow band loop filter circuit (14) is two-way follows.
2. the frequency generating circuit of quick lock according to claim 1, it is characterised in that：It is described according to the master control core
Piece (20) output control signal controlling switch conducting direction, with realize the broadband loop filter circuit (13) with it is described narrow
Band loop filter circuit (14) it is two-way follow including：In the broadband loop filter circuit (13) and the phase-locked loop circuit (11)
During connection, the conducting direction of control second switch (162) and the 3rd switch (163) so that the broadband loop filter circuit
(13) voltage signal of output is flowed to described narrow by second switch (162), operational amplifier (161) and the 3rd switch (163)
Band loop filter circuit (14), to realize broadband loop filtered electrical described in the voltage follow of the narrow band loop filter circuit (14)
The voltage on road (13)；
Or when the narrow band loop filter circuit (14) is connected with the phase-locked loop circuit (11), control second switch
(162) and the 3rd switch (163) conducting direction so that the voltage signal of the narrow band loop filter circuit (14) output passes through
3rd switch (163), operational amplifier (161) and second switch (162) flow to the broadband loop filter circuit (13), with reality
The voltage of narrow band loop filter circuit (14) described in the voltage follow of the existing broadband loop filter circuit (13).
3. the frequency generating circuit of quick lock according to claim 2, it is characterised in that：The second switch (162)
With the combination that the described 3rd switch (163) is single-pole double-throw switch (SPDT), DPDT or at least two single-pole single-throw switch (SPST)s.
4. the frequency generating circuit of quick lock according to claim 1, it is characterised in that：Control circuit (16) bag
Include operational amplifier (161) that being used for of being connected with the broadband loop filter circuit (13) realize that signal follows, be connected to institute
State operational amplifier (161) and the 4th switch (164) of the narrow band loop filter circuit (14)；4th switch (164)
The break-make for the control signal controlling switch for being connected with the main control chip (20) and being exported according to the main control chip (20)；Institute
When stating broadband loop filter circuit (13) and being connected with the phase-locked loop circuit (11), the 4th switch (164) conducting, the width
The voltage signal exported with loop filter circuit (13) flows through the operational amplifier (161) and the described 4th switch (164) stream
To the narrow band loop filter circuit (14), to realize wide band loop described in the voltage follow of the narrow band loop filter circuit (14)
The voltage of road filter circuit (13)；And when the narrow band loop filter circuit (14) is connected with the phase-locked loop circuit (11),
4th switch (164) disconnects.
5. the frequency generating circuit of quick lock according to claim 4, it is characterised in that：4th switch (164)
For single-pole double-throw switch (SPDT), DPDT, single-pole single-throw switch (SPST) or unidirectional conducting switch.
6. the frequency generating circuit of the quick lock according to any one of Claims 1 to 5, it is characterised in that：Also include connecting
Be connected between the phase-locked loop circuit (11) and the voltage controlled oscillator (12) be used for filter out voltage controlled oscillator (12) harmonic wave
Feedback circuit (18).
7. the frequency generating circuit of quick lock according to claim 6, it is characterised in that：Also include described for switching
Broadband loop filter circuit (13) or the narrow band loop filter circuit (14) be connected with the phase-locked loop circuit (11) first
Switch (15), for switch the broadband loop filter circuit (13) or the narrow band loop filter circuit (14) with it is described voltage-controlled
5th switch (17) of oscillator (12) connection；The first switch (15) and the 5th switch (17) and the main control chip
(20) break-make for the control signal controlling switch for being connected and being exported according to the main control chip (20).
8. the frequency generating circuit of quick lock according to claim 7, it is characterised in that：The first switch (15),
5th switch (17) is the combination of single-pole double-throw switch (SPDT), DPDT or at least two single-pole single-throw switch (SPST)s.
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| CN201410581688.7A CN104320134B (en) | 2014-10-27 | 2014-10-27 | The frequency generating circuit of quick lock in |
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| CN201410581688.7A CN104320134B (en) | 2014-10-27 | 2014-10-27 | The frequency generating circuit of quick lock in |
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| US10103719B2 (en) | 2013-07-22 | 2018-10-16 | Nvidia Corporation | Integrated voltage regulator with in-built process, temperature and aging compensation |
| CN106199184B (en) * | 2015-05-07 | 2019-12-31 | 苏州普源精电科技有限公司 | Spectrum analyzer with quick phase locking function |
| WO2020041967A1 (en) * | 2018-08-28 | 2020-03-05 | 华为技术有限公司 | Phase locked loop circuit and device using same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234925A (en) * | 1996-09-25 | 1999-11-10 | 诺基亚电信公司 | Control of voltage controlled oscillator |
| CN102122957A (en) * | 2011-03-31 | 2011-07-13 | 海能达通信股份有限公司 | Phase-locking loop rapid locking circuit and method |
| CN102545892A (en) * | 2012-01-18 | 2012-07-04 | 上海华力微电子有限公司 | Circuit of broadband phase-locked loop frequency synthesizer |
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| JP3306588B2 (en) * | 1999-06-26 | 2002-07-24 | 杉晃 草竹 | Buffer type protective fence, method of constructing the same, and cushioning material therefor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234925A (en) * | 1996-09-25 | 1999-11-10 | 诺基亚电信公司 | Control of voltage controlled oscillator |
| CN102122957A (en) * | 2011-03-31 | 2011-07-13 | 海能达通信股份有限公司 | Phase-locking loop rapid locking circuit and method |
| CN102545892A (en) * | 2012-01-18 | 2012-07-04 | 上海华力微电子有限公司 | Circuit of broadband phase-locked loop frequency synthesizer |
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