CN109194308A - The crystal oscillating circuit that multi-frequency automatically switches - Google Patents
The crystal oscillating circuit that multi-frequency automatically switches Download PDFInfo
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- CN109194308A CN109194308A CN201811333993.9A CN201811333993A CN109194308A CN 109194308 A CN109194308 A CN 109194308A CN 201811333993 A CN201811333993 A CN 201811333993A CN 109194308 A CN109194308 A CN 109194308A
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- 239000013078 crystal Substances 0.000 title claims abstract description 193
- 230000010355 oscillation Effects 0.000 claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 68
- 230000005611 electricity Effects 0.000 claims description 11
- 238000004891 communication Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/01—Details
- H03K3/011—Modifications of generator to compensate for variations in physical values, e.g. voltage, temperature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/13—Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals
- H03K5/135—Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals by the use of time reference signals, e.g. clock signals
Abstract
The invention discloses the crystal oscillating circuits that a kind of multi-frequency automatically switches, belong to crystal oscillating circuit field, it includes multistage crystal oscillating circuit and switching circuit, central processing unit exports corresponding pulse signal to switching circuit according to the reference frequency of the clock signal currently needed, when switching circuit receives pulse signal, control corresponding sub- crystal oscillating circuit access, other sub- crystal oscillating circuit open circuits, the sub- crystal oscillating circuit of access sends the clock signal of demand frequency to central processing unit, there is the present invention crystal oscillating circuit to automatically switch in different frequencies of oscillation, switch accurate and quick effect.
Description
Technical field
The present invention relates to the technical field of crystal oscillating circuit, the crystal oscillator electricity automatically switched more particularly, to a kind of multi-frequency
Road.
Background technique
At present the central processing units such as single-chip microcontroller or integrated chip require at work clock circuit provided for it is stable
Oscillation frequency clock, i.e. time signal, the faster central processing unit of the oscillation frequency clock of clock circuit or integrated chip can
The time of control is more accurate.And frequency of oscillation mainly is generated by crystal oscillating circuit in clock circuit, when 5G etc. needs high
In the technology of clock frequency, crystal oscillating circuit is needed to generate high and stable frequency of oscillation.Common high-frequency crystal oscillator circuit is very
It is easy to be influenced by conditions such as ambient temperature, vibrations, and is difficult to use for a long time, so using high-frequency crystal oscillator circuit
When, all various compensation circuits can be added to high-frequency crystal oscillator circuit in most of producer, or directly adopt low frequency crystal oscillating circuit amplification frequency
Rate.
Central processing unit 1 in the communication apparatus such as present mobile phone needs crystal oscillating circuit to provide the clock of different frequency letter
Number.
The prior art can refer to the Chinese invention patent that application notification number is CN102694523A, and it discloses a kind of crystal oscillators
Circuit comprising the quartz crystal oscillator and a variable capacitance in parallel with the quartz crystal oscillator of a parallel resonance.In this way, by changing
The capacitance for becoming the variable capacitance can adjust the reference frequency for the clock signal that the crystal oscillating circuit generates.
Prior art among the above has the following deficiencies: the communication apparatus such as mobile phone in access 5G or other are higher
When mobile network, the reference frequency of the clock signal needed is higher, but in communication apparatus such as mobile phones because of the originals such as signal problem
When because accessing the mobile networks of lower levels such as 4G, 3G suddenly, the reference frequency of the clock signal needed is lower, so being required to
The crystal oscillating circuit of different frequencies of oscillation is provided；Above-mentioned technology is changed when changing the frequency of oscillation of crystal oscillating circuit by then passing through
Capacitance changes frequency of oscillation, is difficult to accurately to transform to the frequency of oscillation of needs during being switched fast.
Summary of the invention
The object of the present invention is to provide the crystal oscillating circuits that a kind of multi-frequency automatically switches, and crystal oscillating circuit is in different frequencies of oscillation
Middle automatic switchover, switching are accurate and quick.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of crystal oscillating circuit that multi-frequency automatically switches, comprising:
Multistage crystal oscillating circuit, the multistage crystal oscillating circuit include that the son of multiple reference frequencies that can export different clocks signal is brilliant
Shake circuit；
Switching circuit, the switching circuit connection central processing unit and multistage crystal oscillating circuit, central processing unit is according to current needs
The reference frequency of clock signal export corresponding pulse signal to switching circuit, when switching circuit receives pulse signal,
Corresponding sub- crystal oscillating circuit access is controlled, other sub- crystal oscillating circuit open circuits.
By using above scheme, every sub- crystal oscillating circuit can export the clock signal of fixed oscillation frequency, center
Processor is issued to switching circuit according to the reference frequency of the clock signal currently needed and is requested, and switching circuit is different to control
Sub- crystal oscillating circuit work, to realize automatic switchover of the crystal oscillating circuit in different frequencies of oscillation, every sub- crystal oscillating circuit is switching
When can accurately export the clock signal of corresponding oscillation frequency, handoff procedure is than very fast, in the communication apparatus signal such as mobile phone
It can be converted in time when changing suddenly.
The present invention is further arranged to: sub- crystal oscillating circuit includes that the low frequency for the clock signal that can export lower frequency is voltage-controlled
The high frequency Voltage Controlled Crystal Oscillator of compensation crystal oscillator and the clock signal that upper frequency can be exported；
When central processing unit needs the reference frequency of the clock signal of upper frequency, central processing unit exports high to switching circuit
Level signal, switching circuit control high frequency Voltage Controlled Crystal Oscillator access, the voltage-controlled compensation crystal oscillator open circuit of low frequency；
When central processing unit needs the reference frequency of the clock signal of lower frequency, central processing unit is not exported to switching circuit
Signal, switching circuit control the voltage-controlled compensation crystal oscillator access of low frequency, high frequency Voltage Controlled Crystal Oscillator open circuit.
By using above scheme, only uses two voltage-controlled compensation crystal oscillators and be usually enough to the communications such as reply mobile phone and set
The variation of standby signal, in compensation crystal oscillator voltage-controlled using low frequency, central processing unit is not necessary to export to switching circuit
Signal further saves loss.
The present invention is further arranged to: switching circuit includes the single-pole double-throw relay being electrically connected on central processing unit,
Single-pole double-throw relay is also electrically coupled to the VC of the VC mouth and high frequency Voltage Controlled Crystal Oscillator of the voltage-controlled compensation crystal oscillator of low frequency
Mouthful；
When central processing unit exports high level signal to single-pole double-throw relay, single-pole double-throw relay controls the voltage-controlled crystalline substance of high frequency
The VC mouth of oscillation body device is connected with central processing unit；
When central processing unit stops exporting high level signal to single-pole double-throw relay, single-pole double-throw relay controls low frequency pressure
The VC mouth of control compensation crystal oscillator is connected with central processing unit.
By using above scheme, being switched over using single-pole double-throw relay, switching is accurate and quick, and structure is simple,
It is small to the loss of component in handoff procedure repeatedly.
The present invention is further arranged to: the OUT port of the voltage-controlled compensation crystal oscillator of low frequency is electrically connected with capacitor C1, electricity
Hold the C1 other end to be electrically connected on central processing unit；The OUT port of the high frequency Voltage Controlled Crystal Oscillator is electrically connected with capacitor C2, electricity
Hold the C2 other end to be electrically connected on central processing unit.
By using above scheme, the clock signal that capacitor C1 exports the voltage-controlled compensation crystal oscillator of low frequency is filtered
Wave, reduces the clutter in the clock signal of the voltage-controlled compensation crystal oscillator output of low frequency, and capacitor C2 vibrates high frequency voltage-controlled crystal (oscillator)
The clock signal of device output is filtered, and reduces the clutter in the clock signal of high frequency Voltage Controlled Crystal Oscillator output, guarantees vibration
Swing frequency stabilization.
The present invention is further arranged to: switching circuit includes the cmos transistor Q1 being electrically connected on central processing unit,
The base stage of cmos transistor Q1 is electrically connected on central processing unit, and the collector of cmos transistor Q1 is electrically connected with power supply VCC,
The emitter of cmos transistor Q1 is electrically connected with DC relay and cmos transistor Q2, and DC relay is electrically connected to low frequency pressure
Control the VCC mouth of compensation crystal oscillator；The base stage of cmos transistor Q2 is electrically connected to the emitter of cmos transistor Q1, and cmos is brilliant
The emitter of body pipe Q2 is electrically connected to the VCC mouth of high frequency Voltage Controlled Crystal Oscillator.
By using above scheme, switching is more stable, due to only controlling the power pack of voltage-controlled compensation crystal oscillator,
So the clock pulses that central processing unit is exported to voltage-controlled compensation crystal oscillator is more stable, from the voltage-controlled compensation crystal of low frequency
Oscillator reduces the time that single-pole double-throw relay contact converts when switching to high frequency Voltage Controlled Crystal Oscillator, switch speed is more
Fastly.
The present invention is further arranged to: the VCC mouth of high frequency Voltage Controlled Crystal Oscillator is electrically connected with capacitor C7, cmos transistor
The emitter of Q2 is electrically connected to the capacitor C7 other end.
By using above scheme, since the received electric current of VCC mouth of high frequency Voltage Controlled Crystal Oscillator passes through cmos crystal
Pipe Q1 and cmos transistor Q2, can generate more clutter, need capacitor C7 to the electric current for entering high frequency Voltage Controlled Crystal Oscillator
It is filtered.
The present invention is further arranged to: central processing unit is electrically connected with capacitor C5, and the capacitor C5 other end is electrically connected to low frequency
The VC mouth of voltage-controlled compensation crystal oscillator and the VC mouth of high frequency Voltage Controlled Crystal Oscillator.
By using above scheme, the clock pulses that capacitor C5 can export central processing unit is filtered, and makes low frequency
Voltage-controlled compensation crystal oscillator and the received clock pulses of high frequency Voltage Controlled Crystal Oscillator are more stable.
The present invention is further arranged to: every sub- crystal oscillating circuit is set as the voltage-controlled compensation crystal oscillation of son of different frequency
Device, the VC mouth of every voltage-controlled compensation crystal oscillator of height are electrically commonly connected to central processing unit, every voltage-controlled compensation crystal vibration of height
The OUT port for swinging device is electrically commonly connected to central processing unit, and the VCC mouth of every voltage-controlled compensation crystal oscillator of height is electrically connected with
Cmos transistor Q3, the emitter of each cmos transistor Q3 are electrically connected on the VCC mouth of the voltage-controlled compensation crystal oscillator of son, often
The collector of a cmos transistor Q3 is electrically connected with power supply VCC, and the base stage of each cmos transistor Q3 is electrically connected to central processing
Device.
By using above scheme, the transformation to multi-level clock frequency can be realized, freedom degree is higher, can adapt to a variety of
It is required that signal.
The present invention is further arranged to: the base stage of each cmos transistor Q3 is electrically connected with diode D1, diode D1's
Anode is electrically connected to the base stage of cmos transistor Q3, and the cathode of diode D1 is electrically connected on central processing unit.
By using above scheme, the signal that diode D1 can stop central processing unit accidentally to send, only in centre
When managing device output high level, diode D1 just can be breakdown, and the base stage of corresponding cmos transistor Q3 can obtain electric.
The present invention is further arranged to: between the OUT port and central processing unit of the voltage-controlled compensation crystal oscillator of every height
It is parallel with the capacitor C14 and capacitor C15 being serially connected, capacitor C14 and the adjacent one end capacitor C15 are grounded jointly.
By using above scheme, capacitor C14 and capacitor C15 carry out unification to the clock signal that central processing unit receives
Filtering reduces the clutter in the clock signal that central processing unit receives.
In conclusion the invention has the following advantages:
1. every sub- crystal oscillating circuit can export the clock signal of fixed oscillation frequency, central processing unit is according to current needs
The reference frequency of clock signal issue and request to switching circuit, switching circuit controls different sub- crystal oscillating circuit work, comes
Realize automatic switchover of the crystal oscillating circuit in different frequencies of oscillation, every sub- crystal oscillating circuit can be exported accurately in switching
The clock signal of corresponding oscillation frequency, handoff procedure, can when the communication apparatus signal such as mobile phone changes suddenly than very fast
It is converted in time；
2. only using two pressures when using the scheme of high frequency Voltage Controlled Crystal Oscillator and the voltage-controlled compensation crystal oscillator of low frequency
Control compensation crystal oscillator is usually enough to the variation of the communication apparatus signals such as reply mobile phone, shakes using the voltage-controlled compensation crystal of low frequency
When swinging device, central processing unit is not necessary to further save loss to switching circuit output signal；
3. it can be realized the transformation to multi-level clock frequency when using the scheme of multiple voltage-controlled compensation crystal oscillators of son, from
By Du Genggao, the signal of a variety of requirements can adapt to.
Detailed description of the invention
Fig. 1 is the integral module block diagram of embodiment one；
Fig. 2 is prominent whole circuit diagram in embodiment one；
Fig. 3 is the integrated circuit schematic diagram of embodiment two；
Fig. 4 is the integral module block diagram of embodiment three；
Fig. 5 is prominent whole circuit diagram in embodiment three.
In figure, 1, central processing unit；2, switching circuit；21, single-pole double-throw relay；22, DC relay；3, multistage brilliant
Shake circuit；31, sub- crystal oscillating circuit；311, the voltage-controlled compensation crystal oscillator of low frequency；312, high frequency Voltage Controlled Crystal Oscillator；313, sub
Voltage-controlled compensation crystal oscillator.
Specific embodiment
Embodiment one: a kind of crystal oscillating circuit that multi-frequency automatically switches as depicted in figs. 1 and 2, including is connected to centre
The multistage crystal oscillating circuit 3 managing the switching circuit 2 on device 1 and being connected in switching circuit 2.Multistage crystal oscillating circuit 3 includes multiple crystalline substances
Shake circuit, and sub- crystal oscillating circuit 31 includes the voltage-controlled compensation crystal oscillator 311 of low frequency and high frequency Voltage Controlled Crystal Oscillator 312, low frequency
The voltage-controlled temperature compensation of model VCTCXO can be used in voltage-controlled compensation crystal oscillator 311 and high frequency Voltage Controlled Crystal Oscillator 312
Crystal oscillator.The voltage-controlled compensation crystal oscillator 311 of low frequency can export the clock signal of lower frequency, the vibration of high frequency voltage-controlled crystal (oscillator)
The clock signal of upper frequency can be exported by swinging device 312.
As shown in Fig. 2, switching circuit 2 includes the single-pole double-throw relay 21 being electrically connected on central processing unit 1, hilted broadsword is double
The microminiature signal relay of model HFD4 can be selected by throwing relay 21.Single-pole double-throw relay 21 includes in being electrically connected to
Electromagnetic coil KA1 on central processor 1, the contact S1 being electrically connected on central processing unit 1, to be electrically connected to the voltage-controlled temperature compensation of low frequency brilliant
The contact S3 of the contact S2 of the VC mouth of oscillation body device 311 and the VC mouth for being electrically connected to high frequency Voltage Controlled Crystal Oscillator 312.Electromagnetic wire
Enclose the other end ground connection of KA1.When electromagnetic coil KA1 must not electricity when, contact S1 is connected with contact S2, and central processing unit 1 is to low frequency
Voltage-controlled compensation crystal oscillator 311 transmits clock pulses.When central processing unit 1 exports high level signal to electromagnetic coil KA1,
Contact S1 is connected with contact S3, and central processing unit 1 transmits clock pulses to high frequency Voltage Controlled Crystal Oscillator 312.
As shown in Fig. 2, the VCC mouth of the voltage-controlled compensation crystal oscillator 311 of low frequency is electrically connected with resistance R1, the resistance R1 other end
It is electrically connected with power supply VCC.The GND mouth of the voltage-controlled compensation crystal oscillator 311 of low frequency is grounded, the voltage-controlled compensation crystal oscillator of low frequency
311 OUT port is electrically connected with capacitor C1, and the capacitor C1 other end is electrically connected on central processing unit 1.The voltage-controlled compensation crystal vibration of low frequency
It swings device 311 and passes through the clock signal that capacitor C1 transmits low frequency to central processing unit 1 after receiving clock pulses.Capacitor C1 is to low
Frequently the clock signal that voltage-controlled compensation crystal oscillator 311 exports is filtered, and it is defeated to reduce the voltage-controlled compensation crystal oscillator 311 of low frequency
The clutter in clock signal out guarantees that frequency of oscillation is stablized.
As shown in Fig. 2, the VCC mouth of high frequency Voltage Controlled Crystal Oscillator 312 is electrically connected with resistance R2, the resistance R2 other end is electrically connected
It is connected to power supply VCC.The GND mouth of high frequency Voltage Controlled Crystal Oscillator 312 is grounded, and the OUT port of high frequency Voltage Controlled Crystal Oscillator 312 is electrically connected
It is connected to capacitor C2, the capacitor C2 other end is electrically connected on central processing unit 1.High frequency Voltage Controlled Crystal Oscillator 312 is when receiving
The clock signal that capacitor C2 transmits high frequency to central processing unit 1 is passed through after clock.Capacitor C2 is to high frequency Voltage Controlled Crystal Oscillator
The clock signal of 312 outputs is filtered, and reduces the clutter in the clock signal that high frequency Voltage Controlled Crystal Oscillator 312 exports, and is protected
Frequency of oscillation is demonstrate,proved to stablize.
As shown in Fig. 2, the capacitor C3 and capacitor C4 being serially connected are parallel between capacitor C2 and central processing unit 1, electricity
Hold the adjacent one end C3 and capacitor C4 to be grounded jointly.The clock signal that capacitor C3 and capacitor C4 receives central processing unit 1 into
Row uniform filtering reduces the clutter in the clock signal that central processing unit 1 receives.
Usage mode: when the communication apparatus such as mobile phone are when accessing 5G etc. compared with high-level network, central processing unit 1 is to electromagnetism
Coil KA1 exports high level signal, at this time contact S1 and contact S3 conducting, and central processing unit 1 is to high frequency Voltage Controlled Crystal Oscillator
312 output clock pulses, high frequency Voltage Controlled Crystal Oscillator 312 exports the clock signal of high frequency to central processing unit 1, for centre
Device 1 is managed to use.
When the communication apparatus such as mobile phone are when falling on the lower levels network such as 4G, 3G suddenly, central processing unit 1 stops to electricity
Magnetic coil KA1 exports high level signal, at this time contact S1 and contact S2 conducting, and central processing unit 1 is to the voltage-controlled compensation crystal of low frequency
Oscillator 311 exports clock pulses, and the voltage-controlled compensation crystal oscillator 311 of low frequency is believed to the clock of 1 output low frequency of central processing unit
Number, it is used for central processing unit 1.Realize automatic switchover of the crystal oscillating circuit in different frequencies of oscillation, switching is accurate and quick,
It is repeatedly small to the loss of component in handoff procedure.
Embodiment two: a kind of crystal oscillating circuit that multi-frequency automatically switches, as shown in figure 3, switching circuit 2 includes being electrically connected to
The base stage of cmos transistor Q1, cmos transistor Q1 on central processing unit 1 is electrically connected on central processing unit 1, cmos crystal
The collector of pipe Q1 is electrically connected with resistance R3, and the resistance R3 other end is electrically connected with power supply VCC.The emitter electricity of cmos transistor Q1
It is connected with DC relay 22, DC relay 22 includes the electromagnetic coil being electrically connected on the emitter of cmos transistor Q1
The normally-closed contact KA2-1 of KA2 and the VCC mouth for being electrically connected to the voltage-controlled compensation crystal oscillator 311 of low frequency.Electromagnetic coil KA2 is another
End ground connection, the normally-closed contact KA2-1 other end are electrically connected with resistance R5, and the resistance R5 other end is electrically connected with power supply VCC.
As shown in figure 3, it is electrically connected with cmos transistor Q2 between the emitter and electromagnetic coil KA2 of cmos transistor Q1,
The base stage of cmos transistor Q2 is electrically connected to the emitter of cmos transistor Q1.The collector of cmos transistor Q2 is electrically connected with electricity
R4 is hindered, the resistance R4 other end is electrically connected with power supply VCC.The emitter of cmos transistor Q2 is electrically connected with capacitor C7, and capacitor C7 is another
One end is electrically connected to the VCC mouth of high frequency Voltage Controlled Crystal Oscillator 312.
When the communication apparatus such as mobile phone are when accessing 5G etc. compared with high-level network, central processing unit 1 is to cmos transistor Q1
Base stage export high level signal, the collector and emitter of cmos transistor Q1 is connected, electromagnetic coil KA2 and cmos crystal
The base stage of pipe Q2 obtains electric.Electromagnetic coil KA2 controls normally-closed contact KA2-1 and disconnects, and loses the voltage-controlled compensation crystal oscillator 311 of low frequency
Electricity stops working.The collector and emitter of cmos transistor Q2 is connected, and makes high frequency Voltage Controlled Crystal Oscillator 312 that must establish beginning work by cable
Make.
When the communication apparatus such as mobile phone suddenly fall on the lower levels network such as 4G, 3G when, central processing unit 1 stop to
The base stage of cmos transistor Q1 exports high level signal, and the voltage-controlled compensation crystal oscillator 311 of low frequency obtains electric start-up operation at this time, high
312 power loss of frequency Voltage Controlled Crystal Oscillator stops working.Due to the received electric current warp of the VCC mouth of high frequency Voltage Controlled Crystal Oscillator 312
Cmos transistor Q1 and cmos transistor Q2 is crossed, more clutter can be generated, capacitor C7 is needed to shake to high frequency voltage-controlled crystal (oscillator) is entered
The electric current for swinging device 312 is filtered.
As shown in figure 3, central processing unit 1 is electrically connected with capacitor C5, the capacitor C5 other end is electrically connected to the voltage-controlled temperature compensation of low frequency
The VC mouth of crystal oscillator 311 and the VC mouth of high frequency Voltage Controlled Crystal Oscillator 312.Central processing unit 1 is simultaneously to the voltage-controlled temperature of low frequency
It mends crystal oscillator 311 and high frequency Voltage Controlled Crystal Oscillator 312 transmits clock pulses.
As shown in figure 3, the GND mouth of the voltage-controlled compensation crystal oscillator 311 of low frequency is grounded, the voltage-controlled compensation crystal oscillator of low frequency
311 OUT port is electrically connected with capacitor C6, and the capacitor C6 other end is electrically connected to central processing unit 1.High frequency Voltage Controlled Crystal Oscillator
312 OUT port is electrically connected with capacitor C8, and the capacitor C8 other end is electrically connected between central processing unit 1 and capacitor C6.In capacitor C8
It is total that the adjacent one end the capacitor C9 and capacitor C10 being serially connected, capacitor C9 and capacitor C10 is parallel between central processing unit 1
With ground connection.The voltage-controlled compensation crystal oscillator 311 of low frequency can pass through the clock letter that capacitor C6 transmits low frequency to central processing unit 1
Number.High frequency Voltage Controlled Crystal Oscillator 312 can pass through the clock signal that capacitor C8 transmits high frequency to central processing unit 1.
Embodiment three: a kind of crystal oscillating circuit that multi-frequency automatically switches, as shown in Figure 4 and Figure 5, the difference with embodiment one
Place is that every sub- crystal oscillating circuit 31 is set as the voltage-controlled compensation crystal oscillator 313 of son of different frequency.Every voltage-controlled temperature of height
The VC mouth for mending crystal oscillator 313 is electrically connected with capacitor C11 jointly, and the capacitor C11 other end is electrically connected to central processing unit 1.Often
The GND mouth of the voltage-controlled compensation crystal oscillator 313 of height is grounded.The OUT port of every voltage-controlled compensation crystal oscillator 313 of height is common
It is electrically connected with capacitor C12, the capacitor C12 other end is electrically connected to central processing unit 1.Every voltage-controlled compensation crystal oscillator 313 of height
VCC mouth be electrically connected with cmos transistor Q3, the emitter of each cmos transistor Q3 is electrically connected to the voltage-controlled compensation crystal of son
On the VCC mouth of oscillator 313.The collector of each cmos transistor Q3 is electrically connected with resistance R6, the electrical connection of the resistance R6 other end
There is power supply VCC.The base stage of each cmos transistor Q3 is electrically connected with diode D1, and the anode of diode D1 is electrically connected to cmos crystalline substance
The base stage of body pipe Q3, the cathode of diode D1 are electrically connected on central processing unit 1, and during each diode D1 is electrically connected to
The different pins of central processor 1.The capacitor C14 and capacitor being serially connected are parallel between capacitor C12 and central processing unit 1
The adjacent one end C15, capacitor C14 and capacitor C15 is grounded jointly.
When the communication apparatus such as mobile phone are in the different network of access demand clock frequency, central processing unit 1 is according to different
The base stage of cmos transistor Q3 of from the network to different sub- crystal oscillating circuits 31 exports high level.When corresponding sub- crystal oscillating circuit 31
The base stage of cmos transistor Q3 when obtaining electric, the corresponding voltage-controlled compensation crystal oscillator 313 of son electric start-up operation.Central processing
VC port transmission clock pulses of the device 1 to all voltage-controlled compensation crystal oscillators 313 of son, the voltage-controlled compensation crystal oscillation of the son of work
Device 313 can transmit clock signal, to realize that freedom degree is higher to the transformation of multi-level clock frequency, Neng Goushi to central processing unit 1
Answer the signal of a variety of requirements.The signal that diode D1 can stop central processing unit 1 accidentally to send, it is only defeated in central processing unit 1
Out when high level, diode D1 just can be breakdown, and the base stage of corresponding cmos transistor Q3 can obtain electric.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (10)
1. the crystal oscillating circuit that a kind of multi-frequency automatically switches characterized by comprising
Multistage crystal oscillating circuit (3), the multistage crystal oscillating circuit (3) includes multiple reference frequencies that can export different clocks signal
Sub- crystal oscillating circuit (31)；
Switching circuit (2), switching circuit (2) connection central processing unit (1) and multistage crystal oscillating circuit (3), central processing unit
(1) corresponding pulse signal is exported to switching circuit (2) according to the reference frequency of the clock signal currently needed, works as switching circuit
(2) when receiving pulse signal, corresponding sub- crystal oscillating circuit (31) access is controlled, other sub- crystal oscillating circuit (31) open circuits.
2. the crystal oscillating circuit that multi-frequency according to claim 1 automatically switches, it is characterised in that: sub- crystal oscillating circuit (31) packet
It includes the voltage-controlled compensation crystal oscillator of low frequency (311) for the clock signal that can export lower frequency and upper frequency can be exported
The high frequency Voltage Controlled Crystal Oscillator (312) of clock signal；
When central processing unit (1) needs the reference frequency of clock signal of upper frequency, central processing unit (1) is to switching circuit
(2) high level signal is exported, switching circuit (2) controls high frequency Voltage Controlled Crystal Oscillator (312) access, the voltage-controlled compensation crystal of low frequency
Oscillator (311) open circuit；
When central processing unit (1) needs the reference frequency of clock signal of lower frequency, central processing unit (1) is not to switching electricity
Road (2) output signal, switching circuit (2) control the voltage-controlled compensation crystal oscillator of low frequency (311) access, the oscillation of high frequency voltage-controlled crystal (oscillator)
Device (312) open circuit.
3. the crystal oscillating circuit that multi-frequency according to claim 2 automatically switches, it is characterised in that: switching circuit (2) includes
The single-pole double-throw relay (21) being electrically connected on central processing unit (1), single-pole double-throw relay (21) are also electrically coupled to low frequency
The VC mouth of voltage-controlled compensation crystal oscillator (311) and the VC mouth of high frequency Voltage Controlled Crystal Oscillator (312)；
When central processing unit (1) exports high level signal to single-pole double-throw relay (21), single-pole double-throw relay (21) control
The VC mouth of high frequency Voltage Controlled Crystal Oscillator (312) processed and central processing unit (1) are connected；
When central processing unit (1) stops exporting high level signal to single-pole double-throw relay (21), single-pole double-throw relay
(21) the VC mouth and central processing unit (1) for controlling the voltage-controlled compensation crystal oscillator of low frequency (311) are connected.
4. the crystal oscillating circuit that multi-frequency according to claim 2 automatically switches, it is characterised in that: the voltage-controlled temperature compensation of low frequency
The OUT port of crystal oscillator (311) is electrically connected with capacitor C1, and the capacitor C1 other end is electrically connected on central processing unit (1)；It is described
The OUT port of high frequency Voltage Controlled Crystal Oscillator (312) is electrically connected with capacitor C2, and the capacitor C2 other end is electrically connected to central processing unit
(1) on.
5. the crystal oscillating circuit that multi-frequency according to claim 2 automatically switches, it is characterised in that: switching circuit (2) includes
The base stage for cmos transistor Q1, the cmos transistor Q1 being electrically connected on central processing unit (1) is electrically connected to central processing unit (1)
On, the collector of cmos transistor Q1 is electrically connected with power supply VCC, and the emitter of cmos transistor Q1 is electrically connected with DC relay
(22) and cmos transistor Q2, DC relay (22) are electrically connected to the VCC mouth of the voltage-controlled compensation crystal oscillator of low frequency (311)；
The base stage of cmos transistor Q2 is electrically connected to the emitter of cmos transistor Q1, and the emitter of cmos transistor Q2 is electrically connected to height
The VCC mouth of frequency Voltage Controlled Crystal Oscillator (312).
6. the crystal oscillating circuit that multi-frequency according to claim 5 automatically switches, it is characterised in that: the oscillation of high frequency voltage-controlled crystal (oscillator)
The VCC mouth of device (312) is electrically connected with capacitor C7, and the emitter of cmos transistor Q2 is electrically connected to the capacitor C7 other end.
7. the crystal oscillating circuit that multi-frequency according to claim 5 automatically switches, it is characterised in that: central processing unit (1) electricity
Be connected with capacitor C5, the capacitor C5 other end be electrically connected to the voltage-controlled compensation crystal oscillator of low frequency (311) VC mouth and high frequency it is voltage-controlled
The VC mouth of crystal oscillator (312).
8. the crystal oscillating circuit that multi-frequency according to claim 1 automatically switches, it is characterised in that: every sub- crystal oscillating circuit
(31) it is set as the voltage-controlled compensation crystal oscillator (313) of son of different frequency, every voltage-controlled compensation crystal oscillator of height (313)
VC mouthfuls are electrically commonly connected to central processing unit (1), and the OUT port of every voltage-controlled compensation crystal oscillator of height (313) is electrically connected jointly
VCC mouth in central processing unit (1), every voltage-controlled compensation crystal oscillator of height (313) is electrically connected with cmos transistor Q3, often
The emitter of a cmos transistor Q3 is electrically connected on the VCC mouth of the voltage-controlled compensation crystal oscillator (313) of son,
The collector of each cmos transistor Q3 is electrically connected with power supply VCC, during the base stage of each cmos transistor Q3 is electrically connected to
Central processor (1).
9. the crystal oscillating circuit that multi-frequency according to claim 8 automatically switches, it is characterised in that: each cmos transistor Q3
Base stage be electrically connected with diode D1, the anode of diode D1 is electrically connected to the base stage of cmos transistor Q3, the yin of diode D1
Pole is electrically connected on central processing unit (1).
10. the crystal oscillating circuit that multi-frequency according to claim 8 automatically switches, it is characterised in that: in the voltage-controlled temperature of every height
It mends and is parallel with the capacitor C14 and capacitor C15 being serially connected between the OUT port and central processing unit (1) of crystal oscillator (313),
Capacitor C14 and the adjacent one end capacitor C15 are grounded jointly.
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| CN201811333993.9A CN109194308A (en) | 2018-11-09 | 2018-11-09 | The crystal oscillating circuit that multi-frequency automatically switches |
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| CN111541451A (en) * | 2020-06-23 | 2020-08-14 | 深圳比特微电子科技有限公司 | Method and clock circuit for up-converting a clock signal |
| CN112732067A (en) * | 2020-12-31 | 2021-04-30 | 展讯通信（上海）有限公司 | Crystal oscillator switching method and device, terminal and storage medium |
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