CN107102273B - ATE power supply test channel expansion structure and its test application method - Google Patents

ATE power supply test channel expansion structure and its test application method Download PDF

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Publication number
CN107102273B
CN107102273B CN201710519250.XA CN201710519250A CN107102273B CN 107102273 B CN107102273 B CN 107102273B CN 201710519250 A CN201710519250 A CN 201710519250A CN 107102273 B CN107102273 B CN 107102273B
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China
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over
current detection
current
branch
power extension
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CN201710519250.XA
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Chinese (zh)
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CN107102273A (en
Inventor
曾志敏
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上海华虹宏力半导体制造有限公司
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Publication of CN107102273A publication Critical patent/CN107102273A/en
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Abstract

The invention discloses a kind of ATE power supply test channel expansion structures; the current foldback circuit that power extension branch includes is used to detect during the test the size of current of corresponding power extension branch, and the connection of power extension branch and measured device is kept when the electric current of current expansion branch is normal;The connection that power extension branch and measured device are disconnected in current expansion branch overcurrent prevents the current expansion branch of overcurrent from dragging down the output voltage in corresponding power supply test channel to influence to connect the test of other power extension branches in same power supply test channel.Current foldback circuit is also for being arranged the on off operating mode of each power extension branch during electrifying startup.The invention also discloses a kind of test application methods of ATE power supply test channel expansion structure.The present invention has overcurrent isolation features, can prevent multiple branch circuit from testing as caused by overcurrent when sharing power supply test channel and kill, moreover it is possible to save branch selection switch.

Description

ATE power supply test channel expansion structure and its test application method

Technical field

The present invention relates to semiconductor integrated circuit manufacturing fields, more particularly to a kind of integrated circuit automatic testing machine (ATE, Auto Test Equipment) power supply test channel expansion structure;The invention further relates to a kind of ATE power supply test channels The test application method of expansion structure.

Background technique

As shown in Figure 1, being the structure chart of existing ATE power supply test channel expansion structure;The test power channel 102 of ATE (Power Supply, PS) quantity is limited under fixed configurations, and dotted line frame 101 indicates the total survey configured in ATE in Fig. 1 Try power channel 102, include it is multiple, 2 test power channels 102 are shown in Fig. 1, in order to respectively the two test power supplys Channel 102 also indicates 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 other than ATE Test power channel 102 is extended, structure shown in Fig. 1 is existing common expansion scheme: a mainly test power supply The output end in channel 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 branches, include that branch selects switch 103 in power extension branch, power extension branch Output end connects corresponding measured device 104.In Fig. 1, in order to distinguish the selection switch 103 of the branch in different branch, to each Road selection switch 103, which has also carried out number, to be indicated, K11, K12 to K1n and K21, K22 to K2n as shown in figure 1;Each branch Measured device 104 is also indicated with DUT11, DUT12 to DUT1n and DUT21, DUT22 to DUT2n respectively.It can be seen by Fig. 1 Out, each test power channel 102 is connected with n power extension branch, each power extension branch provides electricity respectively Source to corresponding measured device 104, provide measured device 104 power supply use respectively P11, P12 to P1n and P21, P22 extremely P2n is indicated.

Existing structure shown in FIG. 1 can easily extend the port number of test power channel 102, but due to multiple quilts Survey device 104 directly shared one resource for testing power channel 102, when in test process if one of measured device 104 because failure leads to the excessive situation of power pin electric current, when the electric current beyond test power channel 102 current drive capability, The setting output voltage of test power channel 102 will be dragged down, so that other for influencing to share the test power channel 102 are 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 state diagram when overcurrent in measured device 104, and DUT11 failure occurs to make its corresponding power extension branch go out in Fig. 2 Existing high current also indicates DUT11 with " applying harmful DUT " in Fig. 2 for more vivid expression, indicates PS1 pairs with " aggrieved DUT " The other each DUT i.e. DUT12 to DUT1n answered, indicate high current with arrow line in the corresponding power extension branch of DUT11, can To find out that so that the output voltage of PS1 declines, and PS1's is defeated since high current occurs in the corresponding power extension branch of DUT11 Meeting is so that the voltage of the corresponding power supply, that is, P12 to P1n of DUT12 to DUT1n declines, to will affect DUT12 after voltage declines out To the proper testing of DUT1n, cause the test of DUT12 to DUT1n abnormal.As shown in Figure 3A, be using structure shown in FIG. 1 into The multiple measured devices 104 of row share a test result figure when PS power supply;In Fig. 3 A, shown in the corresponding circle of label 201 Measured device 104 in each region there is a measured device 104 and the other each quilts for sharing identical PS power supply when overcurrent occurs It surveys device 104 and the abnormal situation of test occurs;It as shown in Figure 3B, 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 201 institute of label of Fig. 3 A in Fig. 3 B Show to exist to test in test abnormal case namely Fig. 3 A in region and kills (overkill) situation.

Summary of the invention

Technical problem to be solved by the invention is to provide a kind of ATE power supply test channel expansion structure, have overcurrent every From function, it can prevent multiple branch circuit from testing as caused by overcurrent when sharing power supply test channel and kill;For this purpose, the present invention also provides one The test application method of kind ATE power supply test channel expansion structure.

In order to solve the above technical problems, ATE power supply test provided by the invention channel expansion structure includes: that multiple power supplys are surveyed It pings, each power supply test channel includes multiple power extension branches, the input terminal connection of each power extension branch The output end of the output end in the corresponding power supply test channel, each power extension branch connects a measured device.

Each power extension branch includes current foldback circuit;The current foldback circuit is used to examine during the test The size of current for surveying the corresponding power extension branch, keeps the power supply when the electric current of the current expansion branch is normal Extend the conducting of branch and the connection of the power extension branch and the measured device;In the current expansion branch overcurrent When so that the power extension branch is disconnected and disconnect the connection of the power extension branch and the measured device, prevent overcurrent The current expansion branch output voltage in the corresponding power supply test channel is dragged down to influence to connect it is same described The test of other power extension branches in power supply test channel.

The current foldback circuit leads on and off for be arranged each power extension branch during electrifying startup Open state.

A further improvement is that the 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 are connected in series, and the over-current detection resistance is in the electricity Source, which extends, forms a voltage drop between the input terminal and output end of branch, the over-current detection comparator detects the overcurrent inspection The size of the voltage drop of measuring resistance simultaneously forms the letter compared with reference voltage 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 according to comparison result formation to the overcurrent protection Switch, the overcurrent protective switch are turned on or off under the control of said control signal;When the power extension branch overcurrent The voltage drop meeting over range of Shi Suoshu over-current detection resistance, the control signal disconnects the overcurrent protective switch, to make The power extension branch disconnects and disconnects the connection of the power extension branch and the measured device;When the power supply expands In normal range (NR), the control signal protects the overcurrent for the voltage drop of the electric current of exhibition branch over-current detection resistance when normal Shield switch is held on, to keep conducting and the power extension branch and the tested device of the power extension branch The connection of part.

A further improvement is that the normal phase input end of the over-current detection comparator connects the defeated of the power extension branch The inverting input terminal of outlet, the over-current detection comparator connects reference voltage;The overcurrent protective switch is that low level is normally opened Type switch.

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 greater than the reference voltage, the control signal is 1, and the overcurrent protective switch is connected.

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.

A further improvement is that the formula of the reference voltage are as follows: Vref=Vcc- Δ Vcc, Vref are described with reference to electricity Pressure, Vcc are the output voltage in the power supply test channel, and Δ Vcc is tolerable error, i.e., in Vcc to the range of Vcc- Δ Vcc The interior measured device can be carried out proper testing.

The formula of the minimum value of the over-current detection resistance are as follows: Rmin=Δ Vcc/Itrig.

The formula of the maximum value of the over-current detection resistance are as follows: Rmax=Δ 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 value of the over-current detection resistance, Itrig is overcurrent trigger value, and Imax is the maximum value of current specification of each measured device under various test conditions, Itrig is greater than Imax.

A further improvement is that Itrig is 3 times~5 times of Imax.

A further improvement is that in the initialization procedure of ATE, when the corresponding power extension branch is in initialization When for that should disconnect, the inverting input terminal 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 in the power supply test channel, and first initialization voltage makes the over-current detection comparator The control signal that output end output size is 0 simultaneously disconnects the overcurrent protective switch, to make the power extension branch Road is disconnected in initialization.

When the corresponding power extension branch is in initialization for that should be connected, the reverse phase of the over-current detection comparator Input terminal connects the second initialization voltage, and second initialization voltage is less than 0V, makes over-current detection described in initialization procedure The overcurrent protective switch simultaneously is connected in the control signal that the output end output size of comparator is 1, to make the electricity Source extends branch and is connected in initialization.

After the completion of initialization, the corresponding over-current detection comparator of the power extension branch that when initialization is connected Inverting input terminal is connected to the reference voltage, the corresponding over-current detection of the power extension branch that when initialization disconnects The voltage of the inverting input terminal of comparator remains first initialization voltage.

In order to solve the above technical problems, the test application method of ATE power supply test provided by the invention channel expansion structure Include the following steps:

Step 1: measured device is connected to the output end of each power extension branch and establishes failure measured device Numbered list initializes the numbered list before the first item test item for carrying out each measured device.

Step 2: the initialization of the current foldback circuit is arranged according to the numbered list into current test item Parameter, described in number when the initiation parameter of the current foldback circuit makes to initialize after powering in the numbered list is corresponding Each power extension branch corresponding to measured device is off-state, and keeps the number in the non-numbered list corresponding Each power extension branch corresponding to the measured device is on state.

Step 3: the upper electrical parameter in each power supply test channel of setting, after each power supply test channel is powered on Output voltage setting is voltage needed for current test item.

Step 4: the number being arranged in the non-numbered list corresponds to corresponding to the measured device after the completion of initialization Each power extension branch the current foldback circuit test parameter.

Step 5: carrying out the test of current test item, in test process, the current foldback circuit detects corresponding institute The size of current for stating power extension branch keeps the power extension branch when the electric current of the current expansion branch is normal Conducting and the connection of the power extension branch and the measured device;Make the electricity in the current expansion branch overcurrent Source extension branch disconnects and disconnects the connection of the power extension branch and the measured device, prevents the electric current of overcurrent The output voltage in the corresponding power supply test channel is dragged down to influence to connect the same power supply test to lead to by extension branch The test of other power extension branches in road.

Step 6: current test item terminates, will occur the current expansion branch pair of overcurrent in current test item The number for the measured device answered is added in the numbered list.

Step 7: next test item that step 2 carries out each measured device to six is repeated, until each quilt All test items for surveying device are all completed.

A further improvement is that the 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 are connected in series, and the over-current detection resistance is in the electricity Source, which extends, forms a voltage drop between the input terminal and output end of branch, the over-current detection comparator detects the overcurrent inspection The size of the voltage drop of measuring resistance simultaneously forms the letter compared with reference voltage 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 according to comparison result formation to the overcurrent protection Switch, the overcurrent protective switch are turned on or off under the control of said control signal;When the power extension branch overcurrent The voltage drop meeting over range of Shi Suoshu over-current detection resistance, the control signal disconnects the overcurrent protective switch, to make The power extension branch disconnects and disconnects the connection of the power extension branch and the measured device;When the power supply expands In normal range (NR), the control signal protects the overcurrent for the voltage drop of the electric current of exhibition branch over-current detection resistance when normal Shield switch is held on, to keep conducting and the power extension branch and the tested device of the power extension branch The connection of part;The test parameter of current foldback circuit described in step 4 includes the reference voltage.

A further improvement is that the normal phase input end of the over-current detection comparator connects the defeated of the power extension branch The inverting input terminal of outlet, the over-current detection comparator connects reference voltage;The overcurrent protective switch is that low level is normally opened Type switch.

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 greater than the reference voltage, the control signal is 1, and the overcurrent protective switch is connected.

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.

A further improvement is that the formula of the reference voltage are as follows: Vref=Vcc- Δ Vcc, Vref are described with reference to electricity Pressure, Vcc are the output voltage in the power supply test channel, and Δ Vcc is tolerable error, i.e., in Vcc to the range of Vcc- Δ Vcc The interior measured device can be carried out proper testing.

The formula of the minimum value of the over-current detection resistance are as follows: Rmin=Δ Vcc/Itrig.

The formula of the maximum value of the over-current detection resistance are as follows: Rmax=Δ 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 value of the over-current detection resistance, Itrig is overcurrent trigger value, and Imax is the maximum value of current specification of each measured device under various test conditions, Itrig is greater than Imax.

A further improvement is that Itrig is 3 times~5 times of Imax.

A further improvement 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 terminal of comparator.

When the corresponding power extension branch is in initialization to disconnect, the reverse phase of the over-current detection comparator is defeated Entering the first initialization voltage of end connection, first initialization voltage is more than or equal to the output voltage in the power supply test channel, First initialization voltage makes the control signal of the output end output size 0 of the over-current detection comparator and makes institute Overcurrent protective switch disconnection is stated, to make power extension branch disconnection in initialization.

When the corresponding power extension branch is in initialization to be connected, the reverse phase of the over-current detection comparator is 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 Compared with the output end output size of device be 1 the control signal and the overcurrent protective switch is connected, to make the power supply Extension branch is connected in initialization.

After the completion of initialization, the test parameter of the current foldback circuit is arranged in step 4 are as follows: the institute be connected when initialization The inverting input terminal for stating the corresponding over-current detection comparator of power extension branch is connected to the reference voltage, when initialization The voltage of the inverting input terminal of the corresponding over-current detection comparator of the power extension branch disconnected remains described the One initialization voltage.

The present invention is provided with current foldback circuit in each power extension branch, when current foldback circuit can detect test pair The size of current for the power extension branch answered keeps power extension branch and tested device when the electric current of current expansion branch is normal The connection of part;The connection of power extension branch and measured device is disconnected, in current expansion branch overcurrent so as to prevent overcurrent Current expansion branch the output voltage in corresponding power supply test channel is dragged down to influencing to connect same power supply test channel The tests of other power extension branches can prevent multiple branch circuit from sharing power supply test logical so the present invention is able to achieve overcurrent isolation It tested and killed as caused by overcurrent when road, so as to improve test accuracy and testing efficiency.

In addition, the present invention will when each power extension branch only passes through current foldback circuit and can be achieved in power-up initializing Each power extension branch for needing to disconnect all disconnects, it is only necessary to which carrying out parameter setting to current foldback circuit can be achieved with, such as: passing through The voltage of the inverting input terminal of over-current detection comparator in current foldback circuit is set, can make to be located at failure measured device The corresponding power extension branch of measured device in numbered list disconnects and is always maintained at disconnection in initialization, and can make non- The corresponding power extension branch of measured device in numbered list is connected in initialization, can be achieved with after test starts in this way Test to measured device, and cut off in measured device overcurrent the branch of the overcurrent.From the foregoing, it will be observed that the present invention does not need to be arranged Additional branch selection switch is come the state of power extension branch each when initialization is arranged, it is only necessary to be arranged current foldback circuit into Row parameter setting can be achieved with, and can further reduce accessory, save the cost.

Detailed description of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

Fig. 1 is the structure chart of existing ATE power supply test channel expansion structure;

Fig. 2 is the state diagram when overcurrent occurs in a measured device of structure shown in Fig. 1;

Fig. 3 A is the test result figure carried out when multiple measured devices share a PS power supply using structure shown in FIG. 1;

Fig. 3 B is the test knot carried out when 1 measured device exclusively enjoys a PS power supply to each measured device on same wafer Fruit figure;

Fig. 4 is the structure chart of ATE power supply test of embodiment of the present invention channel expansion structure;

Fig. 5 is the state diagram when electric current of each measured device during the test of structure shown in Fig. 4 is all normal;

Fig. 6 be structure shown in Fig. 4 occur measured device during the test overcurrent when state diagram.

Specific embodiment

As shown in figure 4, being the structure chart of 1 expansion structure of ATE power supply test of embodiment of the present invention channel;The embodiment of the present invention 1 expansion structure of ATE power supply test channel includes: multiple power supply test channels 1, as shown in dotted line frame 301 in Fig. 4, in dotted line frame Include multiple power supply test channels 1 in 301, since each power supply test channel 1 is all identical, therefore is only shown in Fig. 4 One power supply test channel 1, meanwhile, in Fig. 4 a corresponding power supply test channel 1 also is indicated with PS1.

Each power supply test channel 1 includes multiple power extension branches, by showing a power supply test channel in Fig. 4 1 shared n power extension branch.

The input terminal of each power extension branch connects the output end in the corresponding power supply test channel 1, each described The output end of power extension branch connects a measured device 3.For clearer expression, in Fig. 4, the corresponding each power supply of PS1 The corresponding measured device 3 of extension branch also indicates with DUT11, DUT12 to DUT1n respectively, each power extension branch it is defeated The power supply of outlet output is indicated with PS11, PS12 to PS1n respectively.

Each power extension branch includes current foldback circuit 2;The current foldback circuit 2 is used for during the test The size of current for detecting the corresponding power extension branch, keeps the electricity when the electric current of the current expansion branch is normal Source extends the conducting of branch and the connection of the power extension branch and the measured device 3;In the current expansion branch So that the power extension branch is disconnected and disconnect the connection of the power extension branch and the measured device 3 when overcurrent, prevents Only the output voltage in the corresponding power supply test channel 1 is dragged down to influence connection together by the current expansion branch of overcurrent The test of other power extension branches in the one power supply test channel 1.

The current foldback circuit 2 leads on and off for be arranged each power extension branch during electrifying startup Open state.

In the embodiment of the present invention, the current foldback circuit 2 includes: over-current detection resistance 4,6 and of over-current detection comparator Overcurrent protective switch 5.For clearer expression, in Fig. 4, the corresponding over-current detection electricity of the corresponding each power extension branch of PS1 Resistance 4 also indicates that overcurrent protective switch 5 is also indicated with KK11, KK12 to KK1n respectively, over-current detection with R11, R12 to R1n respectively Comparator 6 is also indicated 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 terminal and output end of power extension branch, the over-current detection comparator 6 detects the mistake It flows the size of the voltage drop of detection resistance 4 and one and reference voltage ratio is 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 export one arrived according to the control signal that comparison result is formed described in Overcurrent protective switch 5, the overcurrent protective switch 5 are 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 branch overcurrent is opened up, the control signal makes the overcurrent protective switch 5 It disconnects, to make the power extension branch disconnection and disconnect the connection of the power extension branch and the measured device 3; When the electric current of the power extension branch 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, to keep the conducting and the power extension of the power extension branch The connection of branch and the measured device 3.

The normal phase input end of the over-current detection comparator 6 is+end connects the output end of the power extension branch, and it is described The inverting input terminal of over-current detection comparator 6 is-end connection reference voltage;The overcurrent protective switch 5 is low level open type Switch.For clearer expression, in Fig. 4, the corresponding over-current detection comparator 6 of the corresponding each power extension branch of PS1 Inverting input terminal connection reference voltage indicated respectively with Vref11, Vref12 to Vref1n;In the embodiment of the present invention, each institute It includes subsequent initial that the inverting input terminal of over-current detection comparator 6, which is stated, as the setting end of the parameter of the current foldback circuit 2 Changing parameter and test parameter, test parameter is exactly reference voltage, namely while needing to be arranged test parameter be 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 On phase input terminal.

When the voltage drop of the over-current detection resistance 4 is in normal range (NR), the positive of the over-current detection comparator 6 is inputted The voltage at end is greater than the reference voltage, and the control signal is 1, and the overcurrent protective switch 5 is connected.

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 is 0, the overcurrent protective switch 5 disconnection.

It being more preferably selected as, the formula of the reference voltage are as follows: Vref=Vcc- Δ Vcc, Vref are the reference voltage, Vcc is the output voltage in the power supply test channel 1, and Δ Vcc is tolerable error, i.e., in the range of Vcc to Vcc- Δ Vcc The measured device 3 can be carried out proper testing, and Vcc is configured according to the needs of the test item of the measured device 3, example Such as, the corresponding Vcc of a test item 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 are as follows: Rmin=Δ Vcc/Itrig.

The formula of the maximum value of the over-current detection resistance 4 are as follows: Rmax=Δ 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 value of the over-current detection resistance 4, Itrig is overcurrent trigger value, and Imax is the maximum value of current specification of each measured device 3 under various test conditions, Itrig is greater than Imax.Itrig also should not be too large under conditions of being greater than Imax, and Itrig is the 3 of Imax in the embodiment of the present invention Times~5 times.

In the initialization procedure of ATE, when the corresponding power extension branch is in initialization to disconnect, the mistake The inverting input terminal 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 make the output end output size of the over-current detection comparator 6 For 0 the control signal and disconnect the overcurrent protective switch 5, to keep the power extension branch disconnected in initialization It opens.That is, the present invention is configured i.e. by the inverting input terminal to the over-current detection comparator 6 plus the first initialization is electric Pressure, the corresponding branch of measured device 3 that those can natively be proved to failure disconnect from the beginning, do not need using volume Outer branch selects switch.

When the corresponding power extension branch is in initialization to be connected, the reverse phase of the over-current detection comparator 6 Input terminal connects the second initialization voltage, and second initialization voltage is less than 0V, makes over-current detection described in initialization procedure The overcurrent protective switch 5 simultaneously is connected in the control signal that the output end output size of comparator 6 is 1, to make described Power extension branch is connected in initialization.

After the completion of initialization, the corresponding over-current detection comparator 6 of the power extension branch that when initialization is connected Inverting input terminal be connected to the reference voltage, the reference voltage of different branch in Fig. 4 respectively with Vref11 extremely Vref1n is indicated.The anti-phase input of the corresponding over-current detection comparator 6 of the power extension branch disconnected when initialization The voltage at end remains first initialization voltage.

Circuit of the embodiment of the present invention can be good at realizing overcurrent isolation:

As shown in figure 5, be the state diagram when electric current of each measured device during the test of structure shown in Fig. 4 is all normal, For clearer expression, in Fig. 5, the corresponding electric current of the corresponding each power extension branch of PS1 is also respectively with I11, I12 to I1n It indicates, the output end voltage of each power extension branch is indicated with V11, V12 to V1n respectively;It can be seen that I11, I12 to I1n all There is no overcurrent, therefore voltage drop of each power extension branch on the over-current detection resistance 5 is both less than Δ Vcc, so that each described Voltage, that is, V11, V12 to V1n of the normal phase input end of over-current detection comparator 6 is both greater than reference voltage, makes each overcurrent inspection " 1 " in output end all output signals 1 i.e. Fig. 5 of comparator 6 is surveyed, 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, be structure shown in Fig. 4 occur measured device during the test overcurrent when state diagram, in Fig. 6 There is overcurrent in display I11, this meeting is so that V11 is less than reference voltage, that is, Vref11, so that the output end of Comp11 exports letter " 0 " in number 0 i.e. Fig. 6, KK11 are disconnected, and power extension branch corresponding to DUT11 disconnects, and other each power extension branches are still It works normally;The power extension branch as corresponding to the DUT11 of overcurrent disconnects, therefore will not cause to drop to the output voltage of PS1 Low influence, so that the test of other each power extension branches will not be influenced.

Test application method of the embodiment of the present invention is extended using ATE of embodiment of the present invention power supply test channel shown in Fig. 4 Structure is tested, following steps:

Step 1: measured device 3 is connected to the output end of each power extension branch and establishes failure measured device 3 Numbered list, initialize the numbered list before the first item test item for carrying out each measured device 3.

Step 2: the initialization of the current foldback circuit 2 is arranged according to the numbered list into current test item Parameter, number of the initiation parameter of the current foldback circuit 2 when making to initialize after powering in the numbered list correspond to institute Stating each power extension branch corresponding to measured device 3 is off-state, and makes the number in the non-numbered list Each power extension branch corresponding to the corresponding measured device 3 is on state.Made by initiation parameter setting The corresponding branch of the measured device 3 that must have been proved to failure 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 terminal of comparator 6.

When the corresponding power extension branch is in initialization to disconnect, the reverse phase of the over-current detection comparator 6 Input terminal connects the first initialization voltage, and first initialization voltage is more than or equal to the output electricity in the power supply test channel 1 Pressure, first initialization voltage make the control signal of the output end output size 0 of the over-current detection comparator 6 simultaneously Disconnect the overcurrent protective switch 5, to make power extension branch disconnection in initialization.

When the corresponding power extension branch is in initialization to be connected, the reverse phase of the over-current detection comparator 6 Input terminal connects the second initialization voltage, and second initialization voltage is less than 0V, makes over-current detection described in initialization procedure The overcurrent protective switch 5 simultaneously is connected in the control signal that the output end output size of comparator 6 is 1, to make described Power extension branch is connected in initialization.

Step 3: the upper electrical parameter in each power supply test channel 1 of setting, after each power supply test channel 1 is powered on Output voltage setting be voltage needed for current test item, when such as: the voltage needed for current test item being 5V, then by Vcc It is set as 5V.

Step 4: carrying out powering on for ATE;After the completion of initialization, it is arranged described in the number correspondence in the non-numbered list The test parameter of the current foldback circuit 2 of each power extension branch corresponding to measured device 3.

In present invention method, the test parameter of the current foldback circuit 2 is set are as follows: the institute be connected when initialization The inverting input terminal for stating the corresponding over-current detection comparator 6 of power extension branch is connected to the reference voltage;The present invention In embodiment, the reference voltage is set as Vref=Vcc- Δ Vcc, such as: when Vcc 5V, Δ Vcc are 0.01V, Vref is 4.99V。

The inverting input terminal of the corresponding over-current detection comparator 6 of the power extension branch disconnected when initialization Voltage remains first initialization voltage.

Step 5: carrying out the test of current test item, in test process, the current foldback circuit 2 detects corresponding The size of current of the power extension branch keeps the power extension branch when the electric current of the current expansion branch is normal Conducting and the power extension branch and the measured device 3 connection;Make institute in the current expansion branch overcurrent The connection that power extension branch disconnected and disconnected the power extension branch and the measured device 3 is stated, the institute of overcurrent is prevented It states current expansion branch and drags down to influence to connect the same power supply by the output voltage in the corresponding power supply test channel 1 The test of other power extension branches of TCH test channel 1.

As shown in figure 5, respectively find out I11, I12 to I1n all without overcurrent, therefore each power extension branch is in the over-current detection Voltage drop on resistance 4 is both less than Δ Vcc, so that voltage, that is, V11 of the normal phase input end of each over-current detection comparator 6, 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 connected to KK1n, each tested device Part 3 realizes proper testing.

As shown in fig. 6, V11 can be made to be less than reference voltage i.e. Vref11 when overcurrent occurs in I11, so that The output end output signal 0 of Comp11 is " 0 " in Fig. 6, and KK11 is disconnected, and power extension branch corresponding to DUT11 disconnects, Its each power extension branch still works normally;The power extension branch as corresponding to the DUT11 of overcurrent disconnects, therefore will not be right The output voltage of PS1 causes reduced influence, so that the test of other each power extension branches will not be influenced.

Step 6: current test item terminates, will occur the current expansion branch pair of overcurrent in current test item The number for the measured device 3 answered is added in the numbered list.

Step 7: next test item that step 2 carries out each measured device 3 to six is repeated, until each quilt All test items for surveying device 3 are all completed.

The present invention has been described in detail through specific embodiments, but these are not constituted to limit of the invention System.Without departing from the principles of the present invention, those skilled in the art can also make many modification and improvement, these are also answered It is considered as protection scope of the present invention.

Claims (6)

1. a kind of ATE power supply test channel expansion structure characterized by comprising multiple power supply test channels, each power supply TCH test channel includes multiple power extension branches, and the input terminal of each power extension branch connects the corresponding power supply test The output end of the output end in channel, each power extension branch connects a measured device;
Each power extension branch includes current foldback circuit;
The current foldback circuit is used to detect during the test the size of current of the corresponding power extension branch, in institute State current expansion branch electric current it is normal when keep conducting and the power extension branch and the institute of the power extension branch State the connection of measured device;The power extension branch is set to disconnect and disconnect the electricity in the current expansion branch overcurrent Source extends the connection of branch and the measured device, prevents the current expansion branch of overcurrent by the corresponding power supply test The output voltage in channel drags down to influence to connect the survey of other power extension branches in the same power supply test channel Examination;
The current foldback circuit is during electrifying startup for the conducting of each power extension branch to be arranged and disconnects shape State;
The current foldback circuit includes: over-current detection resistance, over-current detection comparator and overcurrent protective switch;The overcurrent inspection Measuring resistance and the overcurrent protective switch are connected in series, the over-current detection resistance the power extension branch input terminal and A voltage drop is formed between output end, the over-current detection comparator detects the size of the voltage drop of the over-current detection resistance And the signal compared with reference voltage, the over-current detection comparator are formed according to the voltage drop of the over-current detection resistance Output end export control signal that one forms according to comparison result to the overcurrent protective switch, the overcurrent protective switch It is turned on or off under the control of said control signal;The electricity of the over-current detection resistance when the power extension branch overcurrent Pressure drop can over range, the control signal disconnects the overcurrent protective switch, thus make the power extension branch disconnection with And disconnect the connection of the power extension branch and the measured device;Described in when the electric current of the power extension branch is normal The voltage drop of over-current detection resistance is in normal range (NR), and the control signal is held on the overcurrent protective switch, to protect Hold the conducting of the power extension branch and the connection of the power extension branch and the measured device;
The normal phase input end of the over-current detection comparator connects the output end of the power extension branch, the over-current detection ratio Inverting input terminal compared with device connects reference voltage;The overcurrent protective switch is low level open type switch;
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 greater 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;
The formula of the reference voltage are as follows: Vref=Vcc- Δ Vcc, Vref are the reference voltage, and Vcc is the power supply test The output voltage in channel, Δ Vcc are tolerable error, i.e., the measured device can be carried out in the range of Vcc to Vcc- Δ Vcc Proper testing;
The formula of the minimum value of the over-current detection resistance are as follows: Rmin=Δ Vcc/Itrig;
The formula of the maximum value of the over-current detection resistance are as follows: Rmax=Δ 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 value of the over-current detection resistance, Itrig For overcurrent trigger value, Imax is the maximum value of current specification of each measured device under various test conditions, and Itrig is greater than Imax。
2. ATE power supply test as described in claim 1 channel expansion structure, it is characterised in that: Itrig is 3 times~the 5 of Imax Times.
3. ATE power supply test as described in claim 1 channel expansion structure, it is characterised in that: in the initialization procedure of ATE In, when the corresponding power extension branch 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 are more than or equal to the output voltage in the power supply test channel, institute State the first initialization voltage make the over-current detection comparator output end output size 0 the control signal and make described Overcurrent protective switch disconnects, to make power extension branch disconnection in initialization;
When the corresponding power extension branch is in initialization for that should be connected, the anti-phase input of the over-current detection comparator The second initialization voltage of end connection, second initialization voltage are less than 0V, compare over-current detection described in initialization procedure The overcurrent protective switch simultaneously is connected in the control signal that the output end output size of device is 1, so that the power supply be made to expand Exhibition branch is connected in initialization;
After the completion of initialization, the reverse phase for the corresponding over-current detection comparator of the power extension branch that when initialization is connected Input terminal is connected to the reference voltage, and the corresponding over-current detection of the power extension branch that when initialization disconnects compares The voltage of the inverting input terminal of device remains first initialization voltage.
4. the test application method of ATE power supply test as described in claim 1 channel expansion structure, which is characterized in that including Following steps:
Step 1: measured device is connected to the output end of each power extension branch and establishes the number of failure measured device List initializes the numbered list before the first item test item for carrying out each measured device;
Step 2: the initiation parameter of the current foldback circuit is set according to the numbered list into current test item, Number of the initiation parameter of current foldback circuit when making to initialize after powering in the numbered list corresponds to described tested Each power extension branch corresponding to device is off-state, and is made described in the number correspondence in the non-numbered list Each power extension branch corresponding to measured device is on state;
Step 3: the upper electrical parameter in each power supply test channel of setting, the output after each power supply test channel is powered on Voltage needed for voltage is set as current test item;
Step 4: after the completion of initialization, it is each corresponding to the corresponding measured device of the number being arranged in the non-numbered list The test parameter of the current foldback circuit of the power extension branch;
Step 5: carrying out the test of current test item, in test process, the current foldback circuit detects the corresponding electricity Source extends the size of current of branch, and the conducting of the power extension branch is kept when the electric current of the current expansion branch is normal And the connection of the power extension branch and the measured device;Expand the power supply in the current expansion branch overcurrent Exhibition branch disconnects and disconnects the connection of the power extension branch and the measured device, prevents the current expansion of overcurrent The output voltage in the corresponding power supply test channel is dragged down to influence to connect the same power supply test channel by branch The test of other power extension branches;
Step 6: current test item terminates, the current expansion branch for occurring overcurrent in current test item is corresponding The number of measured device is added in the numbered list;
Step 7: next test item that step 2 carries out each measured device to six is repeated, until each tested device All test items of part are all completed;
The current foldback circuit includes: over-current detection resistance, over-current detection comparator and overcurrent protective switch;The overcurrent inspection Measuring resistance and the overcurrent protective switch are connected in series, the over-current detection resistance the power extension branch input terminal and A voltage drop is formed between output end, the over-current detection comparator detects the size of the voltage drop of the over-current detection resistance And the signal compared with reference voltage, the over-current detection comparator are formed according to the voltage drop of the over-current detection resistance Output end export control signal that one forms according to comparison result to the overcurrent protective switch, the overcurrent protective switch It is turned on or off under the control of said control signal;The electricity of the over-current detection resistance when the power extension branch overcurrent Pressure drop can over range, the control signal disconnects the overcurrent protective switch, thus make the power extension branch disconnection with And disconnect the connection of the power extension branch and the measured device;Described in when the electric current of the power extension branch is normal The voltage drop of over-current detection resistance is in normal range (NR), and the control signal is held on the overcurrent protective switch, to protect Hold the conducting of the power extension branch and the connection of the power extension branch and the measured device;Described in step 4 The test parameter of current foldback circuit includes the reference voltage;
The normal phase input end of the over-current detection comparator connects the output end of the power extension branch, the over-current detection ratio Inverting input terminal compared with device connects reference voltage;The overcurrent protective switch is low level open type switch;
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 greater 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;
The formula of the reference voltage are as follows: Vref=Vcc- Δ Vcc, Vref are the reference voltage, and Vcc is the power supply test The output voltage in channel, Δ Vcc are tolerable error, i.e., the measured device can be carried out in the range of Vcc to Vcc- Δ Vcc Proper testing;
The formula of the minimum value of the over-current detection resistance are as follows: Rmin=Δ Vcc/Itrig;
The formula of the maximum value of the over-current detection resistance are as follows: Rmax=Δ 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 value of the over-current detection resistance, Itrig For overcurrent trigger value, Imax is the maximum value of current specification of each measured device under various test conditions, and Itrig is greater than Imax。
5. the test application method of ATE power supply test as claimed in claim 4 channel expansion structure, it is characterised in that: Itrig It is 3 times~5 times of Imax.
6. the test application method of ATE power supply test as claimed in claim 4 channel expansion structure, it is characterised in that: step The initiation parameter of two current foldback circuits is the voltage for being connected to the inverting input terminal of the over-current detection comparator;
When the corresponding power extension branch 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 are more than or equal to the output voltage in the power supply test channel, institute State the first initialization voltage make the over-current detection comparator output end output size 0 the control signal and make described Overcurrent protective switch disconnects, to make power extension branch disconnection in initialization;
When the corresponding power extension branch is in initialization for that should be connected, the anti-phase input of the over-current detection comparator The second initialization voltage of end connection, second initialization voltage are less than 0V, compare over-current detection described in initialization procedure The overcurrent protective switch simultaneously is connected in the control signal that the output end output size of device is 1, so that the power supply be made to expand Exhibition branch is connected in initialization;
After the completion of initialization, the test parameter of the current foldback circuit is arranged in step 4 are as follows: the electricity be connected when initialization The inverting input terminal of the corresponding over-current detection comparator of source extension branch is connected to the reference voltage, and when initialization disconnects The voltage of inverting input terminal of the corresponding over-current detection comparator of the power extension branch remain at the beginning of described first Beginningization voltage.
CN201710519250.XA 2017-06-30 2017-06-30 ATE power supply test channel expansion structure and its test application method CN107102273B (en)

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