CN108828356A - It is a kind of suitable for plurality of specifications crystal oscillator for electrical test circuit - Google Patents
It is a kind of suitable for plurality of specifications crystal oscillator for electrical test circuit Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
Abstract
The invention discloses a kind of suitable for plurality of specifications crystal oscillator for electrical test circuit, including power filtering module, external dc voltage exports two-way after the power filtering module, wherein the first via is straight-through is used as high voltage channel, switch power module and LC accumulator of second tunnel by concatenation are as low-voltage channel, the output end in the high voltage channel and the output end in low-voltage channel are separately connected two input terminals of voltage selection interface, the input terminal of the public output connection linear power supply module of the voltage selection interface, the linear power supply module carries out linear voltage stabilization to the voltage of input and obtains crystal oscillator supply voltage.In addition, the oscillator signal of crystal oscillator output to be measured also passes through Buffer output module Buffer output.It is tested by the crystal oscillator that can be adapted for different power demands for electrical test circuit, there are the advantages such as applied widely, powered stable degree is high, power supply efficiency is high, cost of implementation is low.
Description
Technical field
The invention belongs to crystal oscillator detection technique field, more particularly to it is a kind of suitable for plurality of specifications crystal oscillator for electrical testing
Circuit.
Background technique
Crystal oscillator is the abbreviation of crystal oscillator, refers to and cuts thin slice (referred to as by certain azimuth from one piece of quartz crystal
For chip), the crystal element of IC composition oscillating circuit is added inside encapsulation, which generally uses packed by metal casing, also have
It is encapsulated with glass shell, ceramics or plastics.Therefore, different crystal oscillators usually has a different specifications, including volume size specification,
Supply voltage specification etc..
Further, the constant-temperature crystal oscillator as frequency reference unit is that the system terminals such as communication, navigation, observing and controlling, radar are set
Standby core component, performance indicator are most important to the overall performance of whole system.Therefore, be capable of convenient and efficient to its property
Energy index test seems of crucial importance.
Summary of the invention
The invention mainly solves the technical problem of providing the crystal oscillators of a kind of pair of different power voltage type can be carried out
That tests is integrated for electrical test circuit.
In order to solve the above technical problems, the technical solution adopted by the present invention is that providing a kind of suitable for plurality of specifications crystal oscillator
For electrical test circuit, including power interface, the power interface includes power filtering module, and external dc voltage passes through the electricity
Two-way is exported after the filter module of source, wherein the first via is straight-through is used as high voltage channel, Switching Power Supply mould of second tunnel by concatenation
Block and LC accumulator connect respectively as low-voltage channel, the output end in the high voltage channel and the output end in low-voltage channel
Connect two input terminals of voltage selection interface, the input of the public output connection linear power supply module of the voltage selection interface
End, the linear power supply module carry out linear partial pressure to the voltage of input and obtain crystal oscillator supply voltage.
In the present invention suitable for plurality of specifications crystal oscillator for another embodiment of electrical test circuit, the power filtering module
Including power filter chip BNX025H01L, the power input of the power filter chip passes through power switch and the outside
The anode of DC voltage is connected, and anti-reverse diode is additionally provided at the external dc voltage both ends, in the power input
It is also serially connected with light emitting diode and current-limiting resistance between end and input grounding end, it is described to shine after power switch closure
Diode is lighted, and indicates that the external dc voltage has accessed, and the output end of the power filter chip is exported to rear stage
By the DC voltage of voltage regulation filtering, three output ground terminals are altogether.
In the present invention suitable for plurality of specifications crystal oscillator for another embodiment of electrical test circuit, the external dc voltage
For 15V, the output end of the power filter chip BNX025H01L is the DC voltage 15V by voltage regulation filtering.
In the present invention suitable for plurality of specifications crystal oscillator for another embodiment of electrical test circuit, the switch power module
Including switching power source chip TPS54327, the end VIN of the switching power source chip and the power filter chip BNX025H01L
Output end electrical connection, the end EN on the one hand connect a Switching Power Supply control terminal, on the other hand also by the first enabled resistance with
The end the VIN electrical connection, when Switching Power Supply control terminal is hanging, the end EN obtains enabled letter by the described first enabled resistance
Number and the switching power source chip TPS54327 is worked, when Switching Power Supply control terminal ground connection, then the Switching Power Supply core
Piece TPS54327 does not work；
The end VBST of the switching power source chip TPS54327 is electrically connected by capacitor with the end SW, the end the SW concatenation first
Outputting inductance, the other end output switch power source output voltage of first outputting inductance；
For the switch power source output voltage further by partial pressure RC network regulation, the partial pressure RC network includes connection
The other end of first divider resistance of the switch power source output voltage, first divider resistance connects the Switching Power Supply core
The end VFB of piece TPS54327 is also parallel with the first derided capacitors at the both ends of first divider resistance, and the end VFB is also logical
It crosses the second divider resistance being sequentially connected in series, third divider resistance and the 4th divider resistance and is grounded, in the third divider resistance
And the 4th be further connected with low pressure selection end between divider resistance, and is in the power filter chip BNX025H01L output voltage
When 15V, when low pressure selection end ground connection, the switch power source output voltage is 6.6V, when low pressure selection end is hanging
When, the switch power source output voltage is 4.8V.
In the present invention suitable for plurality of specifications crystal oscillator for another embodiment of electrical test circuit, first outputting inductance
The switch power source output voltage of output is input to the LC accumulator, and the LC accumulator includes 4 nothings in parallel
Polar capacitor and the energy storage inductor being electrically connected with first outputting inductance, one end of the polarity free capacitor is with described
One outputting inductance and energy storage inductor electrical connection, the other end of the polarity free capacitor are grounded, the both ends point of the energy storage inductor
It is not electrically connected with the anode of 2 polar capacitors, the cathode of the polar capacitor is grounded.
In the present invention suitable for plurality of specifications crystal oscillator for another embodiment of electrical test circuit, the linear power supply module
Including linear power supply chip LM1085, the public output electricity at the end IN of the linear power supply chip and voltage selection interface
Connection, the end ADJ connect the collector of a triode, the emitter ground connection of the triode, and base stage connects the first enabled resistance,
The other end of first enabled resistance connects the second enabled resistance, and the other end of the second enabled resistance also selects interface with the voltage
Public output electrical connection, be connected with linear power supply enable end between the described first enabled resistance and the second enabled resistance；
When the linear power supply enable end is hanging, the triode ON, the end the ADJ ground connection of the chip LM1085,
Corresponding OUT terminal is reference voltage output；When linear power supply enable end ground connection, the triode cut-off, the chip
The end ADJ of LM1085 is earth-free, the partial pressure value of corresponding OUT terminal output controllable resistor network；
The controllable resistor network includes the first linear divider resistance and described between the end ADJ and the OUT terminal
The second linear divider resistance, third linear divider resistance, the 4th linear partial pressure electricity are in series between the end ADJ and the ground terminal
Resistance, the 5th linear divider resistance, the 6th linear divider resistance, and in the third linear divider resistance and the 4th linear partial pressure
It is provided with the first partial pressure control terminal between resistance, is arranged between the 5th linear divider resistance and the 6th linear divider resistance
There is the second partial pressure control terminal；
When the IN of the linear power supply chip is terminated into 15V, the first partial pressure control terminal and the second partial pressure control terminal
Hanging, the OUT terminal exports 12V voltage；When the IN of the linear power supply chip is terminated into 6.6V, the first partial pressure control
End processed is hanging, and the second partial pressure control terminal ground connection, the OUT terminal exports 5V voltage；When the IN of the linear power supply chip terminate into
When 4.8V, the first partial pressure control terminal ground connection, the second partial pressure control terminal is hanging, and the OUT terminal exports 3.3V voltage.
In the present invention suitable for plurality of specifications crystal oscillator for another embodiment of electrical test circuit, the voltage selects interface
Including channel selection switch, the enabled switch of Switching Power Supply, low-voltage selection switch, the enabled switch of linear power supply, the first partial pressure choosing
Select switch, the second partial pressure selection switch；
When the channel selection switch selects high voltage channel, the IN of the linear power supply chip is terminated into the power supply
The 15V of the output end output of filtering chip BNX025H01L, the Switching Power Supply is enabled to be switched the Switching Power Supply control terminal
The linear power supply enable end is grounded by ground connection, the enabled switch of the linear power supply, and the first partial pressure selection switch will be described
First low pressure selects end hanging, and the second partial pressure selection switch is also hanging by the second partial pressure control terminal, the linear power supply core
The OUT terminal of piece LM1085 exports 12V voltage；
When the channel selection switch selects low-voltage channel, the Switching Power Supply is enabled to be switched the Switching Power Supply
Control terminal is hanging, and when low-voltage selection switch is by low pressure selection end ground connection, the IN of the linear power supply chip is terminated
Enter the voltage 6.6V from switching power source chip TPS54327 output, the first partial pressure selection switch is by described first point
Press control terminal hanging, the second partial pressure selection switch divides control terminal ground connection, the linear power supply chip LM1085 for second
OUT terminal export 5V voltage；Select end hanging the low pressure when low-voltage selection switchs, the linear power supply chip
IN is terminated into the voltage 4.8V exported from the switching power source chip TPS54327, and the first partial pressure selection switch will be described
First partial pressure control terminal ground connection, the second partial pressure selection switch is hanging by the second partial pressure control terminal, the linear power supply chip
The OUT terminal of LM1085 exports 3.3V voltage.
It is described for electrical test circuit in the present invention suitable for plurality of specifications crystal oscillator for another embodiment of electrical test circuit
It further include the Buffer output module buffered to the oscillator signal of crystal oscillator to be measured output, the Buffer output module includes chip
BUF602ID and voltage stabilizing chip 78L10, the input terminal of the pressure stabilizing 78L10 are defeated with the power filter chip BNX025H01L's
The output end of outlet electrical connection, the pressure stabilizing 78L10 inputs 10V DC voltage, institute to the power end of the chip BUF602ID
The negative power end ground connection of chip BUF602ID is stated, signal input part accesses the oscillator signal of crystal oscillator to be measured by partiting dc capacitor,
And signal output end then passes through the crystal oscillator output signal of the resistance and capacitor output of concatenation Jing Guo buffered.
The beneficial effects of the invention are as follows：The invention discloses a kind of suitable for plurality of specifications crystal oscillator for electrical test circuit,
Including power filtering module, external dc voltage exports two-way after the power filtering module, and wherein the first via is straight-through makees
For high voltage channel, switch power module and LC accumulator of second tunnel by concatenation are as low-voltage channel, the high electricity
The output end of pressure passageway and the output end in low-voltage channel are separately connected two input terminals of voltage selection interface, the voltage choosing
The input terminal of the public output connection linear power supply module of interface is selected, the linear power supply module carries out line to the voltage of input
Property divides to obtain crystal oscillator supply voltage.In addition, the oscillator signal of crystal oscillator output to be measured also passes through Buffer output module Buffer output.
It is tested by the crystal oscillator that can be adapted for different power demands for electrical test circuit, there is applied widely, power supply surely
Ding Dugao, the advantages such as few for electric consumption, cost of implementation is low.
Detailed description of the invention
Fig. 1 be the present invention be suitable for plurality of specifications crystal oscillator for one embodiment composition block diagram of electrical test circuit；
Fig. 2 be the present invention suitable for plurality of specifications crystal oscillator for the power filtering module another embodiment of electrical test circuit
Circuit diagram；
Fig. 3 be the present invention suitable for plurality of specifications crystal oscillator for the switch power module another embodiment of electrical test circuit
With LC accumulator figure；
Fig. 4 be the present invention suitable for plurality of specifications crystal oscillator for the linear power supply module another embodiment of electrical test circuit
Circuit diagram；
Fig. 5 be the present invention be suitable for plurality of specifications crystal oscillator for another embodiment of electrical test circuit voltage selection interface
Circuit diagram；
Fig. 6 be the present invention suitable for plurality of specifications crystal oscillator for the Buffer output module another embodiment of electrical test circuit
Circuit diagram.
Specific embodiment
To facilitate the understanding of the present invention, in the following with reference to the drawings and specific embodiments, the present invention will be described in more detail.
A better embodiment of the invention is given in the attached drawing.But the invention can be realized in many different forms, and unlimited
In this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to the disclosure
Understand more thorough and comprehensive.
It should be noted that unless otherwise defined, all technical and scientific terms used in this specification with belong to
The normally understood meaning of those skilled in the art of the invention is identical.Used term in the description of the invention
It is the purpose in order to describe specific embodiment, is not intended to the limitation present invention.
With reference to the accompanying drawing, various embodiments of the present invention are described in detail.Fig. 1 is that the present invention is suitable for plurality of specifications
Crystal oscillator for one embodiment composition schematic diagram of electrical test circuit.As shown in Figure 1, this includes power interface for electrical test circuit 10,
The power interface includes power filtering module 11, and external dc voltage exports two-way after power filtering module 11, wherein
The first via is straight-through to be used as high voltage channel, and the second tunnel is low-voltage channel, the switch power module 12 by concatenating and LC energy storage electricity
Road composition, the output end in the high voltage channel and the output end in low-voltage channel are separately connected two of voltage selection interface 14
Input terminal, the input terminal of the public output connection linear power supply module 15 of the voltage selection interface 14, the linear power supply
The voltage of 15 pairs of module inputs carries out linear partial pressure and obtains crystal oscillator supply voltage as crystal oscillator 20 to be measured power supply.Here high-pressure channel
It is primarily referred to as the DC voltage channel higher than 10V, the DC voltage that low-pressure channel is primarily referred to as 5V and 5V or less (such as 3.3V) is logical
Road.Since the usual voltage value of external dc voltage can be higher than the supply voltage of crystal oscillator, such as external dc voltage is 15V, works as crystalline substance
When the supply voltage of vibration is 12V, then directly can linearly it be divided by linear power supply module 15, such case is offline
Property power module partial pressure loss it is smaller.But when the supply voltage of crystal oscillator is 5V or 3.3V, if also passing through linear power supply
Module 15 linearly divides 15V voltage, then the partial pressure loss generated by linear power supply module 15 is just very big, needs thus
The switch power module 12 first passed through in low-pressure channel is depressured 15V voltage, it is possible thereby to reduce rear end linear power supply mould
The partial pressure of block 15 is lost, this is also that the present invention can adapt to a variety of crystal oscillator supply voltage demands, while also have very high power supply
Efficiency not will cause the excessive useless power consumption of linear power supply module 15.
Preferably, described for electrical test circuit further includes Buffer output module 16, and external dc voltage is through power filter mould
It exports using Voltage stabilizing module 17 to Buffer output module 16 and powers after block 11, the signal of crystal oscillator 20 to be measured generates end and is linked into institute
The input terminal of Buffer output module 16 is stated, the output end of the Buffer output module 16 is defeated to the crystal oscillation signal to be measured by buffering
Out.
It preferably, is chip BNX025H01L for power filtering module.As shown in Fig. 2, the power input of the chip 11
End B is connected by power switch SW1 with the anode of external dc voltage, is additionally provided with 11D1 counnter attack at external dc voltage both ends
Diode is connect, the polarity of voltage of external dc voltage is prevented to be reversely connected.It is also gone here and there between power input B and input grounding end PSG
It is connected to light emitting diode 11D2 and current-limiting resistance 11R1, after SW1 closure, light emitting diode 11D2 is lighted, and indicates external voltage
It has accessed.Output end CB after the module filtered passes through the DC voltage of voltage regulation filtering to rear stage output.Three defeated
Ground terminal CG is altogether out.Preferably, the external dc voltage is 15V, the output of the power filter chip BNX025H01L
End is by the DC voltage 15V of voltage regulation filtering.
Preferably, switch power module includes chip TPS54327.As shown in figure 3, the end VIN of the chip 12 and Fig. 2 institute
The end the HV electrical connection shown, the end also pass through polar capacitor 12E1 and polarity free capacitor 12C1 ground connection, and the end SS is connect by capacitor 12C2
Ground, VREGS are grounded by capacitor 12C3, and the end CG is directly grounded, and the end VBST is electrically connected by capacitor 12C4 with the end SW, the end SW concatenation
First outputting inductance 12L1, the other end output switch power source output voltage of the first outputting inductance 12L1, the Switching Power Supply
Output voltage is the output voltage of the switch power module 12, it can be seen that the switch power source output voltage is also by partial pressure RC
Network, i.e. the 4th divider resistance 12R2 to the first divider resistance 12R5 and the first derided capacitors 12C5 RC network formed tune
Control.
In addition, on the one hand the end EN of the chip 12 directly meets Switching Power Supply control terminal SWEN, on the other hand also pass through first
Enabled resistance 12R1 is electrically connected with the end VIN.When Switching Power Supply control terminal SWEN is hanging, the end EN passes through the first enabled resistance 12R1
Available enable signal and work, when Switching Power Supply control terminal SWEN ground connection when, then the chip 12 will no longer work.
Further, the partial pressure RC network includes the first divider resistance for connecting the switch power source output voltage
The other end of 12R5, the first divider resistance 12R5 connect the end VFB of the switching power source chip TPS54327, described
The both ends of one divider resistance 12R5 are also parallel with the first derided capacitors 12C5, and the end VFB also passes through second point be sequentially connected in series
Piezoresistance 12R4, third divider resistance 12R3 and the 4th divider resistance 12R2 and be grounded, in the third divider resistance 12R3 and
Low pressure selection end SWVIG is further connected between 4th divider resistance 12R2, and defeated in the power filter chip BNX025H01L
When voltage is 15V out, when low pressure selection end SWVIG ground connection, the switch power source output voltage is 6.6V, switch electricity
The calculation method of source output voltage is：Vout=0.765 × (1+12R5/ (12R3+12R4)).When the low pressure selects end
When SWVIG is hanging, the switch power source output voltage is 4.8V.Also, the calculation method of the switch power source output voltage is：
Vout=0.765 × (1+12R5/ (12R2+12R3+12R4)).
Preferably, divider resistance 12R5=143k Ω, 12R4=18k Ω, 12R3=510 Ω, 12R2=8.2k Ω.It is aobvious
So, when SWVIG is grounded, Vout=0.765 × (1+143/ (18+0.51))=6.675V, approximate above-mentioned 6.6V and in error
Within；When SWVIG is hanging, Vout=0.765 × (1+143/ (18+0.51+8.2))=4.86V, approximate above-mentioned 4.8V and
Within error.
Therefore, it can be seen that the switch power module as low-pressure channel, on the one hand can pass through Switching Power Supply control terminal
SWEN controls whether the module has voltage output, can select end SWVIG by low pressure on the other hand to control module tool
The output voltage values of body, suitable supply voltage to can targetedly be selected by being conducive to rear stage linear power supply module in this way
On the other hand the crystal oscillator of different size has the problems such as saving energy consumption, reducing current supply loss and fever.
Further, the switch power source output voltage of the output of the first outputting inductance 12L1 described in Fig. 3 is input to institute
State LC accumulator, the LC accumulator includes 4 polarity free capacitor 13C1 to 13C4 in parallel, and with it is described first defeated
The energy storage inductor 13L1 of inductance 12L1 electrical connection, one end of the polarity free capacitor 13C1 to 13C4 are exported with described first out
Inductance 12L1 and energy storage inductor 13L1 electrical connection, the other end of the polarity free capacitor 13C1 to 13C4 are grounded, the energy storage
The both ends of inductance 13L1 are electrically connected with the anode of 2 polar capacitors 13E1,13E2 respectively, described polar capacitor 13E1,13E2's
Cathode is grounded.Accumulator 13 in energy storage LC accumulator corresponding diagram 1 mainly exports switch power module 12
Power supply signal is stored, and guarantees that the power supply after powering off of stablizing and be unlikely to occur of rear stage supply voltage is interrupted suddenly, to rear
Primary circuit is powered protection.
Output voltage can effectively be adjusted by the LC accumulator after switching power source chip TPS54327, mainly
The on-off ratio (duty ratio) of output is adjusted by the switching tube of quick on-off in switching power source chip TPS54327 to control
The average value of DC voltage is exported, such as after the switching tube in switching power source chip TPS54327 is connected, to the first output electricity
12L1 and energy storage inductor 13L1 is felt to rear stage load supplying, and charge simultaneously to energy storage inductor 13L1, energy storage inductor 13L1
It is equivalent to constant-current source, plays the role of quickly transmitting energy, polar capacitor 13E2 is equivalent to constant pressure source, plays filtering in circuit and makees
With, and after the switching tube in switching power source chip TPS54327 turns off, the energy of energy storage inductor 13L1 storage passes through polarity electricity
Hold 13E1 forming circuit, rear stage load is continued to power, to ensure that load obtains continuous electric current.
Preferably, linear power supply includes chip LM1085.As shown in figure 4, the end IN of the linear power supply chip with it is described
Voltage selects the end the public output MV electrical connection of interface.The end MV is an input terminal, which is selected interface by voltage in Fig. 1
14 controls, when voltage selection interface 14 selects high voltage channel, MV terminates the high voltage of the end HV output shown in Fig. 2, such as
15V；When voltage selection interface 14 selects low-voltage channel, MV terminates the low-voltage of the end LV output shown in Fig. 3, such as 6.6V
Or 4.8V.
The end ADJ connects the collector of a triode 15Q1, the emitter ground connection of the triode 15Q1, base stage connection the
The other end of one enabled resistance 15R2, the first enabled resistance 15R2 connect the second enabled resistance 15R1, the second enabled resistance 15R1
The other end also with the voltage selection interface the end public output MV be electrically connected, make in the described first enabled resistance and second
The linear power supply enable end end LVEN can be connected between resistance；
When the linear power supply enable end LVEN is hanging, the triode 15Q1 conducting, the ADJ of the chip LM1085
End ground connection, corresponding OUT terminal are reference voltage output, are equivalent to the chip and stop working；When the linear power supply enable end
When LVEN is grounded, the triode 15Q1 cut-off, the end ADJ of the chip LM1085 is earth-free, and corresponding OUT terminal output is controllable
The partial pressure value of resistor network；
The controllable resistor network includes the first linear divider resistance 15R3 between the end ADJ and the OUT terminal, and
The second linear divider resistance 15R4, third linear divider resistance 15R5, the 4th are in series between the end ADJ and the ground terminal
Linear divider resistance 15R6, the 5th linear divider resistance 15R7, the 6th linear divider resistance 15R8, and in the third linear
The first partial pressure control terminal LVO3 is provided between the linear divider resistance 15R6 of divider resistance 15R5 and the 4th, it is linear the described 5th
The second partial pressure control terminal LVO5 is provided between the linear divider resistance 15R8 of divider resistance 15R7 and the 6th；
When the IN of the linear power supply chip is terminated into 15V, the first partial pressure control terminal LVO3 and the second partial pressure control
End LVO5 processed is hanging, and the OUT terminal exports 12V voltage, and the method for calculating OUT terminal output voltage is：Vlout=1.25 × (1
+(15R4+15R5+15R6+15R7+15R8)/15R3)；When the IN of the linear power supply chip is terminated into 6.6V, described first
It is hanging to divide control terminal LVO3, the second partial pressure control terminal LVO5 ground connection, the OUT terminal exports 5V voltage, calculates OUT terminal output electricity
The method of pressure is：Vlout=1.25 × (1+ (15R4+15R5+15R6+15R7)/15R3)；As the IN of the linear power supply chip
When terminating into 4.8V, the first partial pressure control terminal LVO3 ground connection, the second partial pressure control terminal LVO5 is hanging, the OUT terminal output
3.3V voltage, the method for calculating OUT terminal output voltage are：Vlout=1.25 × (1+ (15R4+15R5)/15R3).It needs exist for
Illustrate, the calculation method of the output voltage of OUT terminal seems to be not directly dependent upon with input voltage, effectively as linear electricity
It is mainly exactly to obtain output voltage by electric resistance partial pressure to input voltage to source chip, if output voltage is relative to input electricity
When the partial pressure of pressure is smaller, there will be biggish losses, such as 3.3V to be significantly less than 3.3V phase relative to the intrinsic standoff ratio of input 15V
For inputting the intrinsic standoff ratio of 4.8V.In order to improve the power supply efficiency of power supply, 5V and 3.3V is respectively adopted first passes through out here
Powered-down source module obtains corresponding 6.6V and 4.8V, then obtains corresponding 5V and 3.3V by linear power supply module again, switchs
Power module efficiency with higher, and higher intrinsic standoff ratio can be also obtained in linear power supply module, to have height on the whole
Efficiency.In addition linear power supply module has more preferable ripple characteristics, therefore is with linear power supply mould to the power supply that crystal oscillator is directly powered
Block, rather than switch power module is directly used, this is obtained more accurate also for the stabilization for guaranteeing crystal oscillator supply voltage
Measuring condition.
Further, 15R3=100 Ω, 15R4=82 Ω, 15R5=82 Ω, 15R6=100 Ω, 15R7=36 Ω,
15R8=560 Ω.It is 12V, 5V and 3.3V that above-mentioned OUT terminal output voltage, which can be respectively obtained,.
Interface is selected for voltage, mainly completes to select the switching of high-pressure channel and low-pressure channel, and is synchronized pair
Different voltages in low-pressure channel are selected, and are selected the electric resistance partial pressure in linear power supply module.
As shown in figure 5, being selected including the end LV in the output end HV and Fig. 3 to power filtering module in Fig. 2
Channel selection switch 141, to the output control terminal SWEN of the chip TPS54327 in Fig. 3 carry out ground connection or vacantly select open
Powered-down source enables switch 142, and the low-voltage of voltage selection is carried out to the low pressure selection end SWVIG in the partial pressure RC network in Fig. 3
Switch 143 is selected, the linear power supply mould that ground connection is carried out to the enabled control terminal LVEN of the chip LM1085 in Fig. 4 or is vacantly selected
Block enables further to divide the partial pressure control terminal of control terminal LVO3 and second to the first of chip LM1085 in switch 144 and Fig. 4
The voltage of LVO5 output carries out the first partial pressure selection partial pressure selection switch 146 of switch 145, second of selection control.
Switch 141 to 146 shown in Fig. 5 has the function of synchronous interaction, is to according to different size crystal oscillator
Supply voltage it is different, and the syntagmatic that these above-mentioned switches are set is synchronized, for example, then leading to when needing to export 12V voltage
Road select switch 141 the end MV and HV termination be powered connection, selection high voltage channel, the IN of the linear power supply chip terminate into
The 15V of the output end output of the power filter chip BNX025H01L；Switching Power Supply enables switch 142 for switch power module
Control terminal SWEN ground connection, which is in invalid state, because at this moment not needing low-voltage channels operation；Linearly
Power module enables the corresponding linear power supply enable end LVEN ground connection of switch 144, so that linear power supply module effectively works,
It in addition is exactly that the first partial pressure selection partial pressure selection switch 146 of switch 145, second makes the first of chip LM1085 to divide control respectively
The partial pressure of end LVO3 processed and second control terminal LVO5 is hanging, in this way by the available 12V voltage of the OUT output end of chip LM1085
Supply crystal oscillator.
Similar, when needing to export 5V voltage, then the end MV of channel selection switch 141 and LV termination are powered and connect, choosing
Select low-voltage channel；The enabled switch 142 of Switching Power Supply is hanging by the control terminal SWEN of switch power module, the switch power module
It is in running order, because at this moment needing low-voltage channels operation；Low-voltage selection switch 143 is grounded the end SWVIG, described
The IN of linear power supply chip is terminated into the voltage 6.6V exported from the switching power source chip TPS54327, and the end MV is corresponding at this time
Low-voltage be 6.6V；Linear power supply module enables the corresponding end LVEN of switch 144 ground connection, so that the effective work of linear power supply module
Make, in addition the exactly first partial pressure selection switch 145 makes that the first partial pressure control terminal LVO3 is hanging, the second partial pressure selects switch 146
So that the second partial pressure control terminal LVO5 ground connection, supplies crystal oscillator by the available 5V voltage of the OUT output end of chip LM1085 in this way.
3.3V voltage output is aforementioned similar with 5.5V voltage output, the difference is that low-voltage selection switch 143 makes the end SWVIG outstanding
Sky, the IN of the linear power supply chip are terminated into the end voltage 4.8V, MV exported from the switching power source chip TPS54327
Corresponding low-voltage is 4.8V, and the first partial pressure selection switch 145 makes the first partial pressure control terminal LVO3 ground connection, the second partial pressure selection
Switch 146 makes the second partial pressure control terminal LVO5 hanging, in this way by the available 3.3V voltage of the OUT output end of chip LM1085
Supply crystal oscillator.
Preferably, described for electrical test circuit further includes defeated to the buffering that is buffered of oscillator signal of crystal oscillator to be measured output
Module out, Buffer output module 16 include chip BUF602ID and voltage stabilizing chip 78L10.The input terminal of the pressure stabilizing 78L10 with
The output end of the power filter chip BNX025H01L is electrically connected, and the output end of the pressure stabilizing 78L10 is to the chip
The power end of BUF602ID inputs 10V DC voltage.As shown in fig. 6, the power end VCC of chip BUF602ID meets 10V, the 10V
Voltage is to be electrically connected to export stable 10V voltage after Voltage stabilizing module 17 by the end HV of power filtering module in earlier figures 1, this is steady
Die block 17 is preferably chip 78L10.Negative power end-VCC is directly grounded, and signal input part IN is connect by partiting dc capacitor C161
Enter the oscillator signal S20 from crystal oscillator to be measured, and resistance R161 and capacitor the C164 output that output end OUT then passes through concatenation are passed through
The crystal oscillator output signal S21 of buffered.
Interface Matching and isolation can be carried out for rear stage by Buffer output module, ensure that the reliability of test.Tool
It is because crystal oscillator has the characteristic of load regulation, the load for exactly testing crystal oscillator output signal connects and do not connect can shadow for body
The output frequency for ringing it is equivalent to increase by the Buffer output module to guarantee the stability or consistency of output frequency
One matched load, and the matched load also has the characteristic of high resistance input and low resistance output, be also convenient for it is latter
Grade connection.Also, after having the Buffer output module, no matter connecing load below does not still connect the output that load does not affect crystal oscillator
Thus frequency avoids the risk of the variation by the variation bring crystal oscillator output frequency loaded.
The invention discloses a kind of suitable for plurality of specifications crystal oscillator for electrical test circuit, including power filtering module, outside
Portion's DC voltage exports two-way after the power filtering module, and wherein the first via is straight-through is used as high voltage channel, the second tunnel
Switch power module and LC accumulator by concatenation is as low-voltage channel, the output end and low electricity in the high voltage channel
The output end of pressure passageway is separately connected two input terminals of voltage selection interface, and the public output of the voltage selection interface connects
The input terminal of linear power supply module is connect, the linear power supply module carries out linear partial pressure to the voltage of input and obtains crystal oscillator power supply electricity
Pressure.In addition, the oscillator signal of crystal oscillator output to be measured also passes through Buffer output module Buffer output.It can for electrical test circuit by this
It is tested with being suitable for the crystal oscillator of different power demands, with applied widely, powered stable degree is high, few for electric consumption, real
Ready-made low advantage.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure transformation made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant technical fields,
It is included within the scope of the present invention.
Claims (8)
1. it is a kind of suitable for plurality of specifications crystal oscillator for electrical test circuit, including power interface, which is characterized in that the power supply connects
Mouth includes power filtering module, and external dc voltage exports two-way after the power filtering module, and wherein the first via is straight-through
As high voltage channel, switch power module and LC accumulator of second tunnel by concatenation are as low-voltage channel, the height
The output end of voltage channel and the output end in low-voltage channel are separately connected two input terminals of voltage selection interface, the voltage
The input terminal of the public output connection linear power supply module of interface is selected, the linear power supply module carries out the voltage of input
Linear partial pressure obtains crystal oscillator supply voltage.
2. it is according to claim 1 suitable for plurality of specifications crystal oscillator for electrical test circuit, which is characterized in that the power supply
Filter module includes power filter chip BNX025H01L, the power input of the power filter chip by power switch with
The anode of the external dc voltage is connected, and anti-reverse diode is additionally provided at the external dc voltage both ends, described
It is also serially connected with light emitting diode and current-limiting resistance between power input and input grounding end, after power switch closure,
The light emitting diode is lighted, and indicates that the external dc voltage has accessed, and the output end of the power filter chip is backward
The DC voltage of voltage regulation filtering is passed through in level-one output, and three output ground terminals are altogether.
3. it is according to claim 2 suitable for plurality of specifications crystal oscillator for electrical test circuit, which is characterized in that the outside
DC voltage is 15V, and the output end of the power filter chip BNX025H01L is the DC voltage 15V by voltage regulation filtering.
4. it is according to claim 3 suitable for plurality of specifications crystal oscillator for electrical test circuit, which is characterized in that the switch
Power module includes switching power source chip TPS54327, the end VIN of the switching power source chip and the power filter chip
The output end of BNX025H01L is electrically connected, on the one hand the end EN connects a Switching Power Supply control terminal, on the other hand also passes through first
Enabled resistance is electrically connected with the end VIN, and when Switching Power Supply control terminal is hanging, the end EN passes through the described first enabled resistance
It obtains enable signal and the switching power source chip TPS54327 is worked, it is when Switching Power Supply control terminal ground connection, then described
Switching power source chip TPS54327 does not work；
The end VBST of the switching power source chip TPS54327 is electrically connected by capacitor with the end SW, first output of the end SW concatenation
Inductance, the other end output switch power source output voltage of first outputting inductance；
For the switch power source output voltage further by partial pressure RC network regulation, the partial pressure RC network includes described in connection
The other end of first divider resistance of switch power source output voltage, first divider resistance connects the switching power source chip
The end VFB of TPS54327 is also parallel with the first derided capacitors at the both ends of first divider resistance, and the end VFB also passes through
The second divider resistance, third divider resistance and the 4th divider resistance that are sequentially connected in series and be grounded, in the third divider resistance and
It is further connected with low pressure selection end between 4th divider resistance, and is in the power filter chip BNX025H01L output voltage
When 15V, when low pressure selection end ground connection, the switch power source output voltage is 6.6V, when low pressure selection end is hanging
When, the switch power source output voltage is 4.8V.
5. it is according to claim 4 suitable for plurality of specifications crystal oscillator for electrical test circuit, which is characterized in that described first
The switch power source output voltage of outputting inductance output is input to the LC accumulator, and the LC accumulator includes 4
Polarity free capacitor in parallel and the energy storage inductor being electrically connected with first outputting inductance, one end of the polarity free capacitor are equal
It is electrically connected with first outputting inductance and energy storage inductor, the other end of the polarity free capacitor is grounded, the energy storage inductor
Both ends be electrically connected respectively with the anode of 2 polar capacitors, the cathode of the polar capacitor is grounded.
6. it is according to claim 5 suitable for plurality of specifications crystal oscillator for electrical test circuit, which is characterized in that it is described linear
Power module includes linear power supply chip LM1085, and the end IN and the voltage of the linear power supply chip select the public of interface
Output end electrical connection, the end ADJ connect the collector of a triode, the emitter ground connection of the triode, base stage connection first
Enabled resistance, the other end of the first enabled resistance connect the second enabled resistance, the other end of the second enabled resistance also with the electricity
The public output electrical connection of pressure selection interface, connects linear electricity between the described first enabled resistance and the second enabled resistance
Source enable end；
When the linear power supply enable end is hanging, the triode ON, the end the ADJ ground connection of the chip LM1085 is corresponded to
OUT terminal be reference voltage output；When linear power supply enable end ground connection, the triode cut-off, the chip
The end ADJ of LM1085 is earth-free, the partial pressure value of corresponding OUT terminal output controllable resistor network；
The controllable resistor network includes the first linear divider resistance and the ADJ between the end ADJ and the OUT terminal
The second linear divider resistance, third linear divider resistance, the 4th linear divider resistance, the are in series between end and the ground terminal
Five linear divider resistances, the 6th linear divider resistance, and in the third linear divider resistance and the 4th linear divider resistance
Between be provided with the first partial pressure control terminal, is provided between the 5th linear divider resistance and the 6th linear divider resistance
Two partial pressure control terminals；
When the IN of the linear power supply chip is terminated into 15V, the first partial pressure control terminal and the second partial pressure control terminal are outstanding
Sky, the OUT terminal export 12V voltage；When the IN of the linear power supply chip is terminated into 6.6V, the first partial pressure control terminal
Vacantly, the second partial pressure control terminal ground connection, the OUT terminal export 5V voltage；When the IN of the linear power supply chip is terminated into 4.8V
When, the first partial pressure control terminal ground connection, the second partial pressure control terminal is hanging, and the OUT terminal exports 3.3V voltage.
7. it is according to claim 6 suitable for plurality of specifications crystal oscillator for electrical test circuit, which is characterized in that the voltage
Selection interface includes channel selection switch, the enabled switch of Switching Power Supply, low-voltage selection switch, the enabled switch of linear power supply, the
One partial pressure selection switch, the second partial pressure selection switch；
When the channel selection switch selects high voltage channel, the IN of the linear power supply chip is terminated into the power filter
The Switching Power Supply control terminal is grounded by the 15V of the output end output of chip BNX025H01L, the enabled switch of the Switching Power Supply,
The linear power supply enable end is grounded by the enabled switch of the linear power supply, and the first partial pressure selection switch is by described first point
Press control terminal hanging, the second partial pressure selection switch is also hanging by the second partial pressure control terminal, the linear power supply chip
The OUT terminal of LM1085 exports 12V voltage；
When the channel selection switch selects low-voltage channel, the enabled switch of the Switching Power Supply controls the Switching Power Supply
Vacantly, when low-voltage selection switch is by low pressure selection end ground connection, the IN of the linear power supply chip is terminated into next at end
The voltage 6.6V exported from the switching power source chip TPS54327, the first partial pressure selection switch control first partial pressure
End processed is hanging, and the second partial pressure control terminal is grounded by the second partial pressure selection switch, the OUT of the linear power supply chip LM1085
End output 5V voltage；When low-voltage selection switchs low pressure selection end is hanging, the end IN of the linear power supply chip
The voltage 4.8V exported from the switching power source chip TPS54327 is accessed, the first partial pressure selection is switched described first
Control terminal ground connection is divided, the second partial pressure selection switch is hanging by the second partial pressure control terminal, the linear power supply chip
The OUT terminal of LM1085 exports 3.3V voltage.
8. it is according to any one of claims 1 to 7 suitable for plurality of specifications crystal oscillator for electrical test circuit, feature exists
In described for electrical test circuit further includes the Buffer output module that is buffered of oscillator signal to crystal oscillator to be measured output, described
Buffer output module includes that the input terminal of chip BUF602ID and voltage stabilizing chip 78L10, the pressure stabilizing 78L10 and the power supply are filtered
The output end of wave chip BNX025H01L is electrically connected, the power supply of the output end of the pressure stabilizing 78L10 to the chip BUF602ID
End input 10V DC voltage, the negative power end ground connection of the chip BUF602ID, signal input part are accessed by partiting dc capacitor
The oscillator signal of crystal oscillator to be measured, and the crystal oscillator that signal output end then passes through the resistance of concatenation and capacitor is exported Jing Guo buffered is defeated
Signal out.
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