CN107102273A - ATE power supply test passage expansion structures and its test application process - Google Patents
ATE power supply test passage expansion structures and its test application process Download PDFInfo
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- CN107102273A CN107102273A CN201710519250.XA CN201710519250A CN107102273A CN 107102273 A CN107102273 A CN 107102273A CN 201710519250 A CN201710519250 A CN 201710519250A CN 107102273 A CN107102273 A CN 107102273A
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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
- G01R31/40—Testing power supplies
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention discloses a kind of ATE power supply tests passage expansion structure; the current foldback circuit that power extension branch road includes is used for the size of current for detecting corresponding power extension branch road in test process, and the connection of power extension branch road and measured device is kept when the electric current of current expansion branch road is normal；The connection of deenergization extension branch road and measured device in current expansion branch road excessively stream, prevents the current expansion branch road of excessively stream from dragging down the output voltage of corresponding power supply test passage to influence to connect the test of other power extension branch roads of same power supply test passage.Current foldback circuit is used for the on off operating mode for setting each power extension branch road also during electrifying startup.The invention also discloses a kind of test application process of ATE power supply tests passage expansion structure.The present invention has excessively stream isolation features, can prevent multiple branch circuit from testing when sharing power supply test passage as caused by excessively stream to kill, moreover it is possible to save branch road selecting switch.
Description
Technical field
Field, more particularly to a kind of integrated circuit automatic testing machine are manufactured the present invention relates to semiconductor integrated circuit
(ATE, Auto Test Equipment) power supply test passage expansion structure；The invention further relates to a kind of ATE power supply tests passage
The test application process of expansion structure.
Background technology
As shown in figure 1, being the structure chart of existing ATE power supply tests passage expansion structure；ATE test power channel 102
(Power Supply, PS) quantity is limited under fixed configurations, and dotted line frame 101 represents the total survey configured in ATE in Fig. 1
Try power channel 102, include it is multiple, shown in Fig. 12 test power channels 102, in order to respectively the two test power supplys
Passage 102, also represents corresponding test power channel 102 with PS1 and PS2 respectively in Fig. 1.
In order to improve measured device 104 (Device Under Test, DUT) test with survey number, it will usually beyond ATE
Test power channel 102 is extended, structure shown in Fig. 1 is existing common expansion scheme：Mainly one test power supply
The output end of passage 102 is not directly coupled measured device 104, but the output end of each test power channel 102 is same
When connect multiple power extension branch roads, include a branch road selecting switch 103 in power extension branch road, power extension branch road
Output end connects corresponding measured device 104.In Fig. 1, in order to distinguish the branch road selecting switch 103 in different branch, to each
Road selecting switch 103 has also carried out numbering and represented, K11, K12 in such as Fig. 1 to K1n and K21, K22 to K2n；Each branch road
Measured device 104 is also represented with DUT11, DUT12 to DUT1n and DUT21, DUT22 to DUT2n respectively.It can be seen by Fig. 1
Go out, each test power channel 102 is connected with n power extension branch road, and each power extension branch road provides electricity respectively
Source to corresponding measured device 104 there is provided the power supply to measured device 104 respectively with P11, P12 to P1n and P21, P22 extremely
P2n is represented.
Existing structure shown in Fig. 1 can easily extend the port number of test power channel 102, but be due to multiple quilts
Survey device 104 directly share one test power channel 102 resource, when in test process if one of measured device
104 for some reason barrier cause the excessive situation of power pin electric current, when the electric current beyond test power channel 102 current drive capability,
Will drag down test power channel 102 setting output voltage so that influence share the test power channel 102 other be tested
The proper testing of device 104, causes the test of other measured devices 104 abnormal.As shown in Fig. 2 being structure shown in Fig. 1 at one
There is DUT11 in state diagram during excessively stream, Fig. 2 and occurs in that failure so that its corresponding power extension branch road goes out in measured device 104
Existing high current, for more vivid expression, also with " applying harmful DUT " and represent DUT11, with " aggrieved PS1 pairs of DUT " expressions in Fig. 2
The other each DUT i.e. DUT12 to DUT1n answered, high current is represented in the corresponding power extension branch roads of DUT11 with arrow line, can
To find out because the corresponding power extension branch roads of DUT11 occur in that high current so that PS1 output voltage declines, and PS1's is defeated
Going out after voltage declines can be so that the corresponding power supplys of DUT12 to DUT1n i.e. P12 to P1n voltage declines, so that DUT12 can be influenceed
To DUT1n proper testing, cause DUT12 to DUT1n test abnormal.As shown in Figure 3A, it is to be entered using the structure shown in Fig. 1
The multiple measured devices 104 of row share a test result figure during PS power supply；In Fig. 3 A, shown in the corresponding circle of mark 201
Measured device 104 in each region there is a measured device 104 and other each quilts that identical PS power supplys are shared during excessively stream occurs
Survey device 104 and the abnormal situation of test occur；As shown in Figure 3 B, it is that 1 quilt is carried out to each measured device 104 on same wafer
Survey test result figure when device 104 exclusively enjoys a PS power supply, it can be seen that no longer occur Fig. 3 A institute of mark 201 in Fig. 3 B
Show the test abnormal case in region, namely exist to test in Fig. 3 A and kill (overkill) situation.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of ATE power supply tests passage expansion structure, with excessively stream every
From function, it can prevent multiple branch circuit from testing when sharing power supply test passage as caused by excessively stream to kill；Therefore, the present invention also provides one
Plant the test application process of ATE power supply test passage expansion structures.
In order to solve the above technical problems, the ATE power supply test passage expansion structures that the present invention is provided include：Multiple power supplys are surveyed
Ping, each power supply test passage includes multiple power extension branch roads, the input of each power extension branch road is connected
The output end of the corresponding power supply test passage, the output end of each power extension branch road connects a measured device.
Each power extension branch road includes current foldback circuit；The current foldback circuit is used to examine in test process
The size of current of the corresponding power extension branch road is surveyed, the power supply is kept when the electric current of the current expansion branch road is normal
Extend the conducting of branch road and the connection of the power extension branch road and the measured device；In the current expansion branch road excessively stream
When the power extension branch road is disconnected and disconnect the connection of the power extension branch road and the measured device, prevent excessively stream
The current expansion branch road output voltage of the corresponding power supply test passage is dragged down to influence connection same described
The test of other power extension branch roads of power supply test passage.
What the current foldback circuit was used to setting each power extension branch road during electrifying startup leads on and off
Open state.
Further improve is that the current foldback circuit includes：Over-current detection resistance, over-current detection comparator and excessively stream
Protection switch；The over-current detection resistance and the overcurrent protective switch are connected in series, and the over-current detection resistance is in the electricity
A voltage drop is formed between the input and output end of source extension branch road, the over-current detection comparator detects the excessively stream inspection
The size of the voltage drop of measuring resistance simultaneously forms the letter that one and reference voltage compare according to the voltage drop of the over-current detection resistance
Number, the output end of the over-current detection comparator exports a control signal formed according to comparative result to the overcurrent protection
Switch, the overcurrent protective switch is turned on or off under the control of said control signal；When the power extension branch road excessively stream
The voltage drop meeting over range of Shi Suoshu over-current detection resistance, the control signal disconnects the overcurrent protective switch, so that
The power extension branch road disconnects and disconnected the connection of the power extension branch road and the measured device；When the power supply expands
The voltage drop of the over-current detection resistance is in normal range (NR) when the electric current of exhibition branch road is normal, and the control signal protects the excessively stream
Shield switch is held on, so as to keep conducting and the power extension branch road and the tested device of the power extension branch road
The connection of part.
Further improve is that the normal phase input end of the over-current detection comparator connects the defeated of the power extension branch road
Go out end, the inverting input connection reference voltage of the over-current detection comparator；The overcurrent protective switch is that low level is normally opened
Type is switched.
When the voltage drop of the over-current detection resistance is in normal range (NR), the normal phase input end of the over-current detection comparator
Voltage be more than the reference voltage, the control signal is 1, overcurrent protective switch conducting.
When the voltage drop of the over-current detection resistance is in over range, the normal phase input end of the over-current detection comparator
Voltage is less than the reference voltage, and the control signal is 0, and the overcurrent protective switch disconnects.
Further improve is that the formula of the reference voltage is：Vref=Vcc- Δs Vcc, Vref are to be described with reference to electricity
Pressure, Vcc is the output voltage of the power supply test passage, and Δ Vcc is tolerable error, the i.e. scope in Vcc to Vcc- Δs Vcc
The interior measured device can carry out proper testing.
The formula of the minimum value of the over-current detection resistance is：Rmin=Δs Vcc/Itrig.
The formula of the maximum of the over-current detection resistance is：Rmax=Δs Vcc/Imax.
The resistance sizes of the over-current detection resistance all may be used between Rmin and Rmax.
Wherein, Rmin is the minimum value of the over-current detection resistance, and Rmax is the maximum of the over-current detection resistance,
Itrig is excessively stream trigger value, and Imax is the maximum of current specification of each measured device under various test conditions,
Itrig is more than Imax.
Further improve is that Itrig is 3 times~5 times of Imax.
Further improve is, in ATE initialization procedure, when the corresponding power extension branch road is in initialization
During for that should disconnect, the inverting input of the over-current detection comparator connects the first initialization voltage, the first initialization electricity
Pressure is more than or equal to the output voltage of the power supply test passage, and first initialization voltage makes the over-current detection comparator
Output end output size is 0 control signal and disconnects the overcurrent protective switch, so that the power extension branch
Road disconnects in initialization.
When the corresponding power extension branch road initialization when for should turn on when, the over-current detection comparator it is anti-phase
Input connects the second initialization voltage, and second initialization voltage is less than 0V, makes over-current detection described in initialization procedure
The output end output size of comparator is 1 control signal and turns on the overcurrent protective switch, so that the electricity
Source extends branch road and turned in initialization.
After the completion of initialization, the corresponding over-current detection comparator of the power extension branch road turned on during initialization
Inverting input is connected to the reference voltage, the corresponding over-current detection of the power extension branch road disconnected during initialization
The voltage of the inverting input of comparator remains first initialization voltage.
In order to solve the above technical problems, the test application process for the ATE power supply test passage expansion structures that the present invention is provided
Comprise the following steps：
Step 1: measured device is connected into the output end of each power extension branch road and failure measured device is set up
Numbered list, the numbered list is initialized before the Section 1 test event of each measured device is carried out.
Step 2: into current test event, the initialization of the current foldback circuit is set according to the numbered list
Parameter, the numbering correspondence when initiation parameter of the current foldback circuit makes to initialize after electricity in the numbered list is described
Each power extension branch road corresponding to measured device is off-state, and makes the numbering correspondence in the non-numbered list
Each power extension branch road corresponding to the measured device is conducting state.
Step 3: the upper electrical parameter of each power supply test passage is set, after electricity on each power supply test passage
Output voltage setting voltage for needed for current test event.
Step 4: after the completion of initialization, setting corresponding to the numbering correspondence measured device in the non-numbered list
Each power extension branch road the current foldback circuit test parameter.
Step 5: carrying out in the test of current test event, test process, the current foldback circuit detects corresponding institute
The size of current of power extension branch road is stated, the power extension branch road is kept when the electric current of the current expansion branch road is normal
Conducting and the connection of the power extension branch road and the measured device；Make the electricity in the current expansion branch road excessively stream
Source extension branch road disconnects and disconnected the connection of the power extension branch road and the measured device, prevents the electric current of excessively stream
Extension branch road drags down the output voltage of the corresponding power supply test passage to influence the same power supply test of connection to lead to
The test of other power extension branch roads in road.
Step 6: current test event terminates, will occur the current expansion branch road pair of excessively stream in current test event
The numbering for the measured device answered is added in the numbered list.
Step 7: repeat step two to six carries out next test event of each measured device, until each quilt
All test events for surveying device are all completed.
Further improve is that the current foldback circuit includes：Over-current detection resistance, over-current detection comparator and excessively stream
Protection switch；The over-current detection resistance and the overcurrent protective switch are connected in series, and the over-current detection resistance is in the electricity
A voltage drop is formed between the input and output end of source extension branch road, the over-current detection comparator detects the excessively stream inspection
The size of the voltage drop of measuring resistance simultaneously forms the letter that one and reference voltage compare according to the voltage drop of the over-current detection resistance
Number, the output end of the over-current detection comparator exports a control signal formed according to comparative result to the overcurrent protection
Switch, the overcurrent protective switch is turned on or off under the control of said control signal；When the power extension branch road excessively stream
The voltage drop meeting over range of Shi Suoshu over-current detection resistance, the control signal disconnects the overcurrent protective switch, so that
The power extension branch road disconnects and disconnected the connection of the power extension branch road and the measured device；When the power supply expands
The voltage drop of the over-current detection resistance is in normal range (NR) when the electric current of exhibition branch road is normal, and the control signal protects the excessively stream
Shield switch is held on, so as to keep conducting and the power extension branch road and the tested device of the power extension branch road
The connection of part；The test parameter of current foldback circuit described in step 4 includes the reference voltage.
Further improve is that the normal phase input end of the over-current detection comparator connects the defeated of the power extension branch road
Go out end, the inverting input connection reference voltage of the over-current detection comparator；The overcurrent protective switch is that low level is normally opened
Type is switched.
When the voltage drop of the over-current detection resistance is in normal range (NR), the normal phase input end of the over-current detection comparator
Voltage be more than the reference voltage, the control signal is 1, overcurrent protective switch conducting.
When the voltage drop of the over-current detection resistance is in over range, the normal phase input end of the over-current detection comparator
Voltage is less than the reference voltage, and the control signal is 0, and the overcurrent protective switch disconnects.
Further improve is that the formula of the reference voltage is：Vref=Vcc- Δs Vcc, Vref are to be described with reference to electricity
Pressure, Vcc is the output voltage of the power supply test passage, and Δ Vcc is tolerable error, the i.e. scope in Vcc to Vcc- Δs Vcc
The interior measured device can carry out proper testing.
The formula of the minimum value of the over-current detection resistance is：Rmin=Δs Vcc/Itrig.
The formula of the maximum of the over-current detection resistance is：Rmax=Δs Vcc/Imax.
The resistance sizes of the over-current detection resistance all may be used between Rmin and Rmax.
Wherein, Rmin is the minimum value of the over-current detection resistance, and Rmax is the maximum of the over-current detection resistance,
Itrig is excessively stream trigger value, and Imax is the maximum of current specification of each measured device under various test conditions,
Itrig is more than Imax.
Further improve is that Itrig is 3 times~5 times of Imax.
Further improve is that the initiation parameter of current foldback circuit described in step 2 is to be connected to the over-current detection
The voltage of the inverting input of comparator.
When the corresponding power extension branch road initialization when for disconnect when, the over-current detection comparator it is anti-phase defeated
Enter the first initialization voltage of end connection, first initialization voltage is more than or equal to the output voltage of the power supply test passage,
First initialization voltage make the output end output size of the over-current detection comparator for 0 the control signal and make institute
Overcurrent protective switch disconnection is stated, so that the power extension branch road disconnects in initialization.
When the corresponding power extension branch road initialization when for conducting when, the over-current detection comparator it is anti-phase defeated
Enter the second initialization voltage of end connection, second initialization voltage is less than 0V, makes the ratio of over-current detection described in initialization procedure
The control signal for being 1 compared with the output end output size of device simultaneously turns on the overcurrent protective switch, so that the power supply
Extension branch road is turned in initialization.
After the completion of initialization, the test parameter of the step 4 setting current foldback circuit is：The institute turned on during initialization
The inverting input for stating the corresponding over-current detection comparator of power extension branch road is connected to the reference voltage, during initialization
The voltage of the inverting input of the corresponding over-current detection comparator of the power extension branch road disconnected remains described the
One initialization voltage.
The present invention is provided with current foldback circuit in each power extension branch road, when current foldback circuit can detect test pair
The size of current for the power extension branch road answered, power extension branch road and tested device are kept when the electric current of current expansion branch road is normal
The connection of part；The connection of deenergization extension branch road and measured device in current expansion branch road excessively stream, so as to prevent excessively stream
Current expansion branch road the output voltage of corresponding power supply test passage is dragged down so as to influenceing to connect same power supply test passage
Other power extension branch roads test, so the present invention can realize excessively stream isolate, can prevent multiple branch circuit share power supply test lead to
Tested and killed as caused by excessively stream during road, so as to improve test accuracy and testing efficiency.
In addition, the present invention will when each power extension branch road only can be achieved with power-up initializing by current foldback circuit
Each power extension branch road disconnected is needed all to disconnect, it is only necessary to carry out parameter setting to current foldback circuit and can be achieved with, such as：Pass through
The voltage of the inverting input of over-current detection comparator in setting current foldback circuit, with regard to that can make to be located at failure measured device
The corresponding power extension branch road of measured device in numbered list disconnects in initialization and is always maintained at disconnecting, and can make non-
The corresponding power extension branch road of measured device in numbered list is turned in initialization, so can be achieved with after test starts
Test to measured device, and cut off in measured device excessively stream the branch road of the excessively stream.From the foregoing, it will be observed that the present invention need not be set
Extra branch road selecting switch sets the state of each power extension branch road during initialization, it is only necessary to set current foldback circuit to enter
Row parameter setting can be achieved with, and can further reduce accessory, cost-effective.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description：
Fig. 1 is the structure chart of existing ATE power supply tests passage expansion structure；
Fig. 2 is the state diagram when excessively stream occurs in a measured device of structure shown in Fig. 1；
Fig. 3 A are that test result figure when multiple measured devices share a PS power supply is carried out using the structure shown in Fig. 1；
Fig. 3 B are that test knot when 1 measured device exclusively enjoys a PS power supply is carried out to each measured device on same wafer
Fruit is schemed；
Fig. 4 is the structure chart of ATE power supply test passage expansion structures of the embodiment of the present invention；
Fig. 5 be each measured device in test process of structure shown in Fig. 4 electric current it is all normal when state diagram；
Fig. 6 is the state diagram when excessively stream of measured device occurs in test process in structure shown in Fig. 4.
Embodiment
As shown in figure 4, being the structure chart of the expansion structure of ATE power supply tests of embodiment of the present invention passage 1；The embodiment of the present invention
The expansion structure of ATE power supply tests passage 1 includes：Multiple power supply test passages 1, as shown in dotted line frame 301 in Fig. 4, in dotted line frame
Include multiple power supply test passages 1 in 301, because each power supply test passage 1 is all identical, therefore only shown in Fig. 4
One power supply test passage 1, meanwhile, also represent a corresponding power supply test passage 1 with PS1 in Fig. 4.
Each power supply test passage 1 includes multiple power extension branch roads, and a power supply test passage is shown in Fig. 4
1 has n power extension branch road.
The input of each power extension branch road connects the output end of the corresponding power supply test passage 1, each described
The output end of power extension branch road connects a measured device 3.Represented in order to clearer, in Fig. 4, the corresponding each power supplys of PS1
The corresponding measured device 3 of extension branch road also represents with DUT11, DUT12 to DUT1n respectively, each power extension branch road it is defeated
The power supply for going out end output is represented with PS11, PS12 to PS1n respectively.
Each power extension branch road includes current foldback circuit 2；The current foldback circuit 2 is used in test process
The size of current of the corresponding power extension branch road is detected, the electricity is kept when the electric current of the current expansion branch road is normal
The conducting of source extension branch road and the connection of the power extension branch road and the measured device 3；In the current expansion branch road
The power extension branch road is disconnected and disconnect the connection of the power extension branch road and the measured device 3 during excessively stream, prevent
Only the current expansion branch road of excessively stream drags down the output voltage of the corresponding power supply test passage 1 to influence connection same
The test of other power extension branch roads of power supply test passage 1 described in one.
What the current foldback circuit 2 was used to setting each power extension branch road during electrifying startup leads on and off
Open state.
In the embodiment of the present invention, the current foldback circuit 2 includes：Over-current detection resistance 4, the and of over-current detection comparator 6
Overcurrent protective switch 5.Represented in order to clearer, in Fig. 4, the corresponding over-current detection electricity of the corresponding each power extension branch roads of PS1
Resistance 4 also represents that overcurrent protective switch 5 is also represented with KK11, KK12 to KK1n respectively, over-current detection with R11, R12 to R1n respectively
Comparator 6 is also represented with Comp11, Comp12 to Comp1n respectively.
The over-current detection resistance 4 and the overcurrent protective switch 5 are connected in series, and the over-current detection resistance 4 is described
A voltage drop is formed between the input and output end of power extension branch road, the over-current detection comparator 6 detects the mistake
Flow the size of the voltage drop of detection resistance 4 and one and reference voltage ratio are formed according to the voltage drop of the over-current detection resistance 4
Compared with signal, the output end of the over-current detection comparator 6 exports a control signal formed according to comparative result described in
Overcurrent protective switch 5, the overcurrent protective switch 5 is turned on or off under the control of said control signal；When the power supply expands
The voltage drop meeting over range of the over-current detection resistance 4 when opening up branch road excessively stream, the control signal makes the overcurrent protective switch 5
Disconnect, so that the power extension branch road disconnects and disconnected the connection of the power extension branch road and the measured device 3；
When the electric current of the power extension branch road is normal, the voltage drop of the over-current detection resistance 4 is in normal range (NR), the control letter
Number it is held on the overcurrent protective switch 5, so as to keep the conducting of the power extension branch road and the power extension
The connection of branch road and the measured device 3.
The normal phase input end of the over-current detection comparator 6 is+output end for connecting the power extension branch road is held, it is described
The inverting input of over-current detection comparator 6 is-hold connection reference voltage；The overcurrent protective switch 5 is low level open type
Switch.Represented in order to clearer, in Fig. 4, the corresponding over-current detection comparator 6 of the corresponding each power extension branch roads of PS1
Inverting input connection reference voltage represented respectively with Vref11, Vref12 to Vref1n；In the embodiment of the present invention, each institute
State the inverting input of over-current detection comparator 6 sets end to include subsequently initial for the parameter of the current foldback circuit 2
Be when changing parameter and test parameter, test parameter is exactly reference voltage, namely needing and test parameter is set by Vref11,
The reference voltages such as Vref12 to Vref1n are added to the anti-of the corresponding over-current detection comparator 6 of corresponding each power extension branch road
On phase input.
When the voltage drop of the over-current detection resistance 4 is in normal range (NR), the positive input of the over-current detection comparator 6
The voltage at end is more than the reference voltage, and the control signal is 1, and the overcurrent protective switch 5 is turned on.
When the voltage drop of the over-current detection resistance 4 is in over range, the normal phase input end of the over-current detection comparator 6
Voltage be less than the reference voltage, the control signal be 0, the overcurrent protective switch 5 disconnects.
More preferably it is selected as, the formula of the reference voltage is：Vref=Vcc- Δs Vcc, Vref are the reference voltage,
Vcc is the output voltage of the power supply test passage 1, and Δ Vcc is tolerable error, i.e., in the range of Vcc to Vcc- Δs Vcc
The measured device 3 can carry out proper testing, and Vcc is configured the need for the test event according to the measured device 3, example
Such as, the corresponding Vcc of a test event is 5V, and Δ Vcc is 0.01V, then Vref is 4.99V.
The formula of the minimum value of the over-current detection resistance 4 is：Rmin=Δs Vcc/Itrig.
The formula of the maximum of the over-current detection resistance 4 is：Rmax=Δs Vcc/Imax.
The resistance sizes of the over-current detection resistance 4 all may be used between Rmin and Rmax.
Wherein, Rmin is the minimum value of the over-current detection resistance 4, and Rmax is the maximum of the over-current detection resistance 4,
Itrig is excessively stream trigger value, and Imax is the maximum of current specification of each measured device 3 under various test conditions,
Itrig is more than Imax.Itrig is also unsuitable excessive under conditions of more than Imax, and Itrig is the 3 of Imax in the embodiment of the present invention
Times~5 times.
In ATE initialization procedure, when when the corresponding power extension branch road is in initialization to disconnect, the mistake
The inverting input for flowing detection comparator 6 connects the first initialization voltage, and first initialization voltage is more than or equal to the electricity
The output voltage of source TCH test channel 1, first initialization voltage makes the output end output size of the over-current detection comparator 6
The control signal for 0 simultaneously disconnects the overcurrent protective switch 5, so that the power extension branch road is disconnected in initialization
Open.That is, the present invention is configured by the inverting input to the over-current detection comparator 6 and Jia the first initialization is electric
Pressure, the corresponding branch road of measured device 3 that those can natively be proved to failure disconnects from the beginning, it is not necessary to use volume
Outer branch road selecting switch.
When the corresponding power extension branch road initialization when for conducting when, the over-current detection comparator 6 it is anti-phase
Input connects the second initialization voltage, and second initialization voltage is less than 0V, makes over-current detection described in initialization procedure
The output end output size of comparator 6 is 1 control signal and turns on the overcurrent protective switch 5, so that described
Power extension branch road is turned in initialization.
After the completion of initialization, the corresponding over-current detection comparator 6 of the power extension branch road turned on during initialization
Inverting input be connected to the reference voltage, the reference voltage of different branch in Fig. 4 respectively with Vref11 extremely
Vref1n is represented.The anti-phase input of the corresponding over-current detection comparator 6 of the power extension branch road disconnected during initialization
The voltage at end remains first initialization voltage.
Circuit of the embodiment of the present invention can be good at realizing that excessively stream is isolated：
As shown in figure 5, be the state diagram when electric current of each measured device in test process of structure shown in Fig. 4 is all normal,
Represented in order to clearer, in Fig. 5, the corresponding electric current of the corresponding each power extension branch roads of PS1 is also respectively with I11, I12 to I1n
Represent, the output end voltage of each power extension branch road is represented with V11, V12 to V1n respectively；It can be seen that I11, I12 to I1n all
There is no excessively stream, therefore voltage drop of each power extension branch road on the over-current detection resistance 5 is both less than Δ Vcc so that it is each described
The voltage of the normal phase input end of over-current detection comparator 6 be V11, V12 to V1n both greater than reference voltages, make each excessively stream inspection
The output end all output signals 1 for surveying comparator 6 are " 1 " in Fig. 5, and each overcurrent protective switch 5 is that KK11, KK12 are led to KK1n
Logical, each measured device 3 realizes proper testing.
As shown in fig. 6, in being the state diagram when excessively stream of measured device occurs in test process in structure shown in Fig. 4, Fig. 6
There is excessively stream in display I11, and this can cause V11 to be less than reference voltage i.e. Vref11, so that Comp11 output end output letter
" 0 " in number 0 i.e. Fig. 6, KK11 disconnects, and the power extension branch road corresponding to DUT11 disconnects, and other each power extension branch roads are still
Normal work；Because the power extension branch road corresponding to the DUT11 of excessively stream disconnects, therefore drop will not be caused to PS1 output voltage
Low influence, so as to also not interfere with the test of other each power extension branch roads.
Test application process of the embodiment of the present invention is using ATE power supply tests of the embodiment of the present invention passage extension shown in Fig. 4
Structure is tested, following steps：
Step 1: measured device 3 is connected into the output end of each power extension branch road and failure measured device 3 is set up
Numbered list, initialize the numbered list before the Section 1 test event of each measured device 3 is carried out.
Step 2: into current test event, the initialization of the current foldback circuit 2 is set according to the numbered list
Parameter, the numbering correspondence institute when initiation parameter of the current foldback circuit 2 makes to initialize after electricity in the numbered list
Each power extension branch road stated corresponding to measured device 3 is off-state, and makes the numbering in the non-numbered list
Each power extension branch road corresponding to the correspondence measured device 3 is conducting state.Being set by initiation parameter makes
The corresponding branch road of the measured device 3 that failure must be had been proved to is not turned on from the beginning.
In present invention method, the initiation parameter of the current foldback circuit 2 is to be connected to the over-current detection
The voltage of the inverting input of comparator 6.
When the corresponding power extension branch road initialization when for disconnect when, the over-current detection comparator 6 it is anti-phase
Input connects the first initialization voltage, and first initialization voltage is more than or equal to the output electricity of the power supply test passage 1
Pressure, first initialization voltage make the output end output size of the over-current detection comparator 6 for 0 the control signal simultaneously
Disconnect the overcurrent protective switch 5, so that the power extension branch road disconnects in initialization.
When the corresponding power extension branch road initialization when for conducting when, the over-current detection comparator 6 it is anti-phase
Input connects the second initialization voltage, and second initialization voltage is less than 0V, makes over-current detection described in initialization procedure
The output end output size of comparator 6 is 1 control signal and turns on the overcurrent protective switch 5, so that described
Power extension branch road is turned in initialization.
Step 3: the upper electrical parameter of each power supply test passage 1 is set, after electricity on each power supply test passage 1
Output voltage setting for needed for current test event voltage, such as：When voltage needed for current test event is 5V, then by Vcc
It is set to 5V.
Step 4: carrying out ATE upper electricity；After the completion of initialization, set the numbering correspondence in the non-numbered list described
The test parameter of the current foldback circuit 2 of each power extension branch road corresponding to measured device 3.
In present invention method, the test parameter for setting the current foldback circuit 2 is：The institute turned on during initialization
The inverting input for stating the corresponding over-current detection comparator 6 of power extension branch road is connected to the reference voltage；The present invention
In embodiment, the reference voltage is set to Vref=Vcc- Δ Vcc, such as：Vcc is 5V, and when Δ Vcc is 0.01V, Vref is
4.99V。
The inverting input of the corresponding over-current detection comparator 6 of the power extension branch road disconnected during initialization
Voltage remains first initialization voltage.
Step 5: carrying out in the test of current test event, test process, the current foldback circuit 2 detects corresponding
The size of current of the power extension branch road, the power extension branch road is kept when the electric current of the current expansion branch road is normal
Conducting and the power extension branch road and the measured device 3 connection；Make institute in the current expansion branch road excessively stream
The connection that power extension branch road disconnects and disconnected the power extension branch road and the measured device 3 is stated, the institute of excessively stream is prevented
Current expansion branch road is stated to drag down the output voltage of the corresponding power supply test passage 1 to influence the same power supply of connection
The test of other power extension branch roads of TCH test channel 1.
As shown in figure 5, I11, I12 are respectively found out to all no excessively streams of I1n, therefore each power extension branch road is in the over-current detection
Voltage drop on resistance 4 is both less than Δ Vcc so that the voltage of the normal phase input end of each over-current detection comparator 6 be V11,
V12 to V1n is both greater than corresponding reference voltage i.e. Vref11, Vref12 to Vref1n, makes each over-current detection comparator 6
Output end all output signals 1 are " 1 " in Fig. 5, and each overcurrent protective switch 6 is that KK11, KK12 are turned on to KK1n, each tested device
Part 3 realizes proper testing.
As shown in fig. 6, when excessively stream occurs in I11, V11 can be caused to be less than reference voltage i.e. Vref11, so that
Comp11 output end output signal 0 is " 0 " in Fig. 6, and KK11 disconnects, and the power extension branch road corresponding to DUT11 disconnects, its
Its each power extension branch road still normal work；Because the power extension branch road corresponding to the DUT11 of excessively stream disconnects, therefore will not be right
PS1 output voltage causes the influence of reduction, so as to also not interfere with the test of other each power extension branch roads.
Step 6: current test event terminates, will occur the current expansion branch road pair of excessively stream in current test event
The numbering for the measured device 3 answered is added in the numbered list.
Step 7: repeat step two to six carries out next test event of each measured device 3, until each quilt
All test events for surveying device 3 are all completed.
The present invention is described in detail above by specific embodiment, but these not constitute the limit to the present invention
System.Without departing from the principles of the present invention, those skilled in the art can also make many modification and improvement, and these also should
It is considered as protection scope of the present invention.
Claims (12)
1. a kind of ATE power supply tests passage expansion structure, it is characterised in that including：Multiple power supply test passages, each power supply
TCH test channel includes multiple power extension branch roads, and the input of each power extension branch road connects the corresponding power supply test
The output end of passage, the output end of each power extension branch road connects a measured device；
Each power extension branch road includes current foldback circuit；
The current foldback circuit is used for the size of current for detecting the corresponding power extension branch road in test process, in institute
State current expansion branch road electric current it is normal when keep conducting and the power extension branch road and the institute of the power extension branch road
State the connection of measured device；The power extension branch road is set to disconnect and disconnect the electricity in the current expansion branch road excessively stream
Source extends the connection of branch road and the measured device, prevents the current expansion branch road of excessively stream by the corresponding power supply test
The output voltage of passage drags down to influence to connect the survey of other power extension branch roads of the same power supply test passage
Examination；
The current foldback circuit is used to set the conducting of each power extension branch road during electrifying startup and disconnects shape
State.
2. ATE power supply tests passage expansion structure as claimed in claim 1, it is characterised in that：The current foldback circuit bag
Include：Over-current detection resistance, over-current detection comparator and overcurrent protective switch；The over-current detection resistance and the overcurrent protection are opened
Pass is connected in series, and the over-current detection resistance forms a voltage between the input and output end of the power extension branch road
Drop, the over-current detection comparator detects the size of the voltage drop of the over-current detection resistance and according to the over-current detection resistance
Voltage drop form the signal that one and reference voltage compare, the output end of the over-current detection comparator export one according to than
The control signal of relatively result formation is to the overcurrent protective switch, and the overcurrent protective switch is under the control of said control signal
It is turned on or off；When the power extension branch road excessively stream, the voltage drop of the over-current detection resistance can over range, the control
Signal disconnects the overcurrent protective switch, so that the power extension branch road disconnects and disconnected the power extension branch road
With the connection of the measured device；When the electric current of the power extension branch road is normal, the voltage drop of the over-current detection resistance exists
Normal range (NR), the control signal is held on the overcurrent protective switch, so as to keep leading for the power extension branch road
Pass to and the power extension branch road and the measured device connection.
3. ATE power supply tests passage expansion structure as claimed in claim 2, it is characterised in that：The over-current detection comparator
Normal phase input end connect the output end of the power extension branch road, the inverting input connection ginseng of the over-current detection comparator
Examine voltage；The overcurrent protective switch switchs for low level open type；
When the voltage drop of the over-current detection resistance is in normal range (NR), the electricity of the normal phase input end of the over-current detection comparator
Pressure is more than the reference voltage, and the control signal is 1, the overcurrent protective switch conducting；
When the voltage drop of the over-current detection resistance is in over range, the voltage of the normal phase input end of the over-current detection comparator
Less than the reference voltage, the control signal is 0, and the overcurrent protective switch disconnects.
4. ATE power supply tests passage expansion structure as claimed in claim 3, it is characterised in that：The formula of the reference voltage
For：Vref=Vcc- Δs Vcc, Vref are the reference voltage, and Vcc is the output voltage of the power supply test passage, and Δ Vcc is
Tolerable error, i.e., the measured device can carry out proper testing in the range of Vcc to Vcc- Δs Vcc；
The formula of the minimum value of the over-current detection resistance is：Rmin=Δs Vcc/Itrig；
The formula of the maximum of the over-current detection resistance is：Rmax=Δs Vcc/Imax；
The resistance sizes of the over-current detection resistance all may be used between Rmin and Rmax；
Wherein, Rmin is the minimum value of the over-current detection resistance, and Rmax is the maximum of the over-current detection resistance, Itrig
For excessively stream trigger value, Imax is the maximum of current specification of each measured device under various test conditions, and Itrig is more than
Imax。
5. ATE power supply tests passage expansion structure as claimed in claim 4, it is characterised in that：Itrig is 3 times~the 5 of Imax
Times.
6. ATE power supply tests passage expansion structure as claimed in claim 3, it is characterised in that：In ATE initialization procedure
In, when when the corresponding power extension branch road is in initialization for that should disconnect, the anti-phase input of the over-current detection comparator
The first initialization voltage of end connection, first initialization voltage is more than or equal to the output voltage of the power supply test passage, institute
State the first initialization voltage make the output end output size of the over-current detection comparator for 0 the control signal and make described
Overcurrent protective switch disconnects, so that the power extension branch road disconnects in initialization；
When the corresponding power extension branch road is in initialization for that should turn on, the anti-phase input of the over-current detection comparator
The second initialization voltage of end connection, second initialization voltage is less than 0V, compares over-current detection described in initialization procedure
The output end output size of device is 1 control signal and turns on the overcurrent protective switch, so that the power supply expands
Exhibition branch road is turned in initialization；
After the completion of initialization, the corresponding over-current detection comparator of the power extension branch road turned on during initialization it is anti-phase
Input is connected to the reference voltage, and the corresponding over-current detection of the power extension branch road disconnected during initialization compares
The voltage of the inverting input of device remains first initialization voltage.
7. the test application process of ATE power supply tests passage expansion structure as claimed in claim 1, it is characterised in that including
Following steps：
Step 1: measured device is connected into the output end of each power extension branch road and the numbering of failure measured device is set up
List, the numbered list is initialized before the Section 1 test event of each measured device is carried out；
Step 2: into current test event, the initiation parameter of the current foldback circuit is set according to the numbered list,
Numbering correspondence when the initiation parameter of the current foldback circuit makes to initialize after electricity in the numbered list is described tested
Each power extension branch road corresponding to device is off-state, and makes the numbering correspondence in the non-numbered list described
Each power extension branch road corresponding to measured device is conducting state；
Step 3: the upper electrical parameter of each power supply test passage is set, by the output after electricity on each power supply test passage
Voltage is set to voltage needed for current test event；
Step 4: after the completion of initialization, setting each corresponding to the numbering correspondence measured device in the non-numbered list
The test parameter of the current foldback circuit of the power extension branch road；
Step 5: carrying out in the test of current test event, test process, the current foldback circuit detects the corresponding electricity
Source extends the size of current of branch road, and the conducting of the power extension branch road is kept when the electric current of the current expansion branch road is normal
And the connection of the power extension branch road and the measured device；Expand the power supply in the current expansion branch road excessively stream
Exhibition branch road disconnects and disconnected the connection of the power extension branch road and the measured device, prevents the current expansion of excessively stream
Branch road drags down the output voltage of the corresponding power supply test passage to influence the same power supply test passage of connection
The test of other power extension branch roads；
Step 6: current test event terminates, the current expansion branch road for occurring excessively stream in current test event is corresponding
The numbering of measured device is added in the numbered list；
Step 7: repeat step two to six carries out next test event of each measured device, until each tested device
All test events of part are all completed.
8. the test application process of ATE power supply tests passage expansion structure as claimed in claim 7, it is characterised in that：It is described
Current foldback circuit includes：Over-current detection resistance, over-current detection comparator and overcurrent protective switch；The over-current detection resistance and
The overcurrent protective switch is connected in series, the over-current detection resistance the power extension branch road input and output end it
Between form a voltage drop, the over-current detection comparator detects the size of the voltage drop of the over-current detection resistance and according to institute
The voltage drop for stating over-current detection resistance forms the signal that one and reference voltage compare, the output end of the over-current detection comparator
The control signal that output one is formed according to comparative result is to the overcurrent protective switch, and the overcurrent protective switch is in the control
It is turned on or off under the control of signal processed；When the power extension branch road excessively stream, the voltage drop of the over-current detection resistance can surpass
Scope, the control signal disconnects the overcurrent protective switch, so that the power extension branch road disconnects and disconnected institute
State the connection of power extension branch road and the measured device；The over-current detection when the electric current of the power extension branch road is normal
The voltage drop of resistance is in normal range (NR), and the control signal is held on the overcurrent protective switch, so as to keep the electricity
The conducting of source extension branch road and the connection of the power extension branch road and the measured device；Overcurrent protection described in step 4
The test parameter of circuit includes the reference voltage.
9. the test application process of ATE power supply tests passage expansion structure as claimed in claim 8, it is characterised in that：It is described
The normal phase input end of over-current detection comparator connects the output end of the power extension branch road, the over-current detection comparator it is anti-
Phase input connects reference voltage；The overcurrent protective switch switchs for low level open type；
When the voltage drop of the over-current detection resistance is in normal range (NR), the electricity of the normal phase input end of the over-current detection comparator
Pressure is more than the reference voltage, and the control signal is 1, the overcurrent protective switch conducting；
When the voltage drop of the over-current detection resistance is in over range, the voltage of the normal phase input end of the over-current detection comparator
Less than the reference voltage, the control signal is 0, and the overcurrent protective switch disconnects.
10. the test application process of ATE power supply tests passage expansion structure as claimed in claim 9, it is characterised in that：It is described
The formula of reference voltage is：Vref=Vcc- Δs Vcc, Vref are the reference voltage, and Vcc is defeated for the power supply test passage
Go out voltage, Δ Vcc is tolerable error, i.e., the measured device can be surveyed normally in the range of Vcc to Vcc- Δs Vcc
Examination；
The formula of the minimum value of the over-current detection resistance is：Rmin=Δs Vcc/Itrig；
The formula of the maximum of the over-current detection resistance is：Rmax=Δs Vcc/Imax；
The resistance sizes of the over-current detection resistance all may be used between Rmin and Rmax；
Wherein, Rmin is the minimum value of the over-current detection resistance, and Rmax is the maximum of the over-current detection resistance, Itrig
For excessively stream trigger value, Imax is the maximum of current specification of each measured device under various test conditions, and Itrig is more than
Imax。
11. the test application process of ATE power supply tests passage expansion structure as claimed in claim 10, it is characterised in that：
Itrig is 3 times~5 times of Imax.
12. the test application process of ATE power supply tests passage expansion structure as claimed in claim 9, it is characterised in that：Step
The initiation parameter of current foldback circuit described in two is the voltage for the inverting input for being connected to the over-current detection comparator；
When the corresponding power extension branch road is in initialization for that should disconnect, the anti-phase input of the over-current detection comparator
The first initialization voltage of end connection, first initialization voltage is more than or equal to the output voltage of the power supply test passage, institute
State the first initialization voltage make the output end output size of the over-current detection comparator for 0 the control signal and make described
Overcurrent protective switch disconnects, so that the power extension branch road disconnects in initialization；
When the corresponding power extension branch road is in initialization for that should turn on, the anti-phase input of the over-current detection comparator
The second initialization voltage of end connection, second initialization voltage is less than 0V, compares over-current detection described in initialization procedure
The output end output size of device is 1 control signal and turns on the overcurrent protective switch, so that the power supply expands
Exhibition branch road is turned in initialization；
After the completion of initialization, the test parameter of the step 4 setting current foldback circuit is：The electricity turned on during initialization
The inverting input of the corresponding over-current detection comparator of source extension branch road is connected to the reference voltage, is disconnected during initialization
The voltage of inverting input of the corresponding over-current detection comparator of the power extension branch road remain at the beginning of described first
Beginningization voltage.
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