Method for testing electronic components of a repetitive pattern under defined thermal conditions
View Patent ↗The invention relates to a method for testing several electronic components ( 1 ) of a repetitive pattern under defined thermal conditions in a prober, which comprises a chuck ( 10 ) for holding the components ( 1 ) and special holding devices ( 15 ) for holding individual probes ( 12 ). For testing, the components ( 1 ) are adjusted to a defined temperature, the probes ( 12 ) and a first electronic component ( 1 ) are positioned relative to each other by means of at least one positioning device, contact pads ( 3 ) of the electronic component ( 1 ) are subsequently contacted by the probes ( 12 ) so that the component ( 1 ) can be tested and then the positioning and the contacting can be repeated for testing another component ( 1 ) of the repetitive pattern. In order to shorten the test time for measurements at changing temperatures while ensuring reliable contacting of the components by using individual probes, a component ( 1 ) is positioned and contacted by a first positioning step which jointly affects all probes ( 12 ) first being carried out in an intermediate position, in the result of which the component ( 1 ) lies at a defined distance under the probe tips ( 13 ), the position of each individual probe tip ( 13 ) being subsequently corrected by means of separate manipulators to the position of the corresponding contact pad ( 3 ) to be contacted with the particular probe tip ( 13 ) so that each probe tip ( 13 ) lies above a contact pad ( 3 ), and the probe tips ( 13 ) further subsequently being brought into contact with the contact pads ( 3 ) of the component ( 1 ) by means of an advancing movement.
1. A method for testing a plurality of electronic components ( 1 ) of a repetitive pattern under defined thermal conditions in a prober, which has a chuck ( 10 ) for holding the plurality of electronic components ( 1 ) and probe holders ( 15 ) for holding individual probes ( 12 ) having corresponding probe tips ( 13 ), wherein the plurality of electronic components ( 1 ) have contact islands ( 3 ) for contacting the plurality of electronic components by means of the probes ( 12 ), the method comprising:
setting the plurality of the electronic components ( 1 ) to a defined temperature;
positioning the probes ( 12 ) and a first electronic component ( 1 ) of the plurality of electronic components relative to one another by means of at least one positioning apparatus;
subsequently contacting the contact islands ( 3 ) of the first electronic component ( 1 ) by the probes ( 12 );
testing the first electronic component ( 1 ); and
following this, repeating the positioning and the contacting of the plurality of electronic components of the repetitive pattern and testing for a second electronic component ( 1 ) of the plurality of electronic components, wherein the repeating is characterized in that positioning and contacting of the second electronic component ( 1 ) is conducted by:
conducting a first positioning step, which jointly relates to all of the probes ( 12 ), into an intermediate position, as a result of which the second electronic component ( 1 ) is situated in a work region ( 4 ), in which the contacting will take place, and is situated at a defined distance below probe tips ( 13 );
correcting a position of each individual probe tip ( 13 ) to a position of a corresponding contact island ( 3 ) of the second electronic component ( 1 ) to be contacted by the respective probe tip ( 13 ) by means of separate manipulators that are associated with each probe ( 12 ) such that each probe tip ( 13 ) is situated over the corresponding contact island ( 3 ) of the second electronic component ( 1 ); and
contacting the probe tips ( 13 ) with the contact islands ( 3 ) of the second electronic component by means of a feed motion between all of the probe tips ( 13 ) and the second electronic component.
2. The method as claimed in claim 1 , characterized in that the position of the individual probe tips ( 13 ) and the position of the corresponding contact islands ( 3 ) of the second electronic component ( 1 ) to be contacted are registered by means of image recognition and this is used to establish the required corrections to the positions of the individual probe tips ( 13 ) with respect to the corresponding contact islands ( 3 ).
3. The method as claimed in claim 2 , characterized in that the correcting includes generating a control signal that controls an operation of a manipulator that is associated with an individual probe tip.
4. The method as claimed in claim 1 , characterized in that the corrections to the positions of the probes ( 12 ) are conducted by motorized manipulators.
5. The method as claimed in claim 4 , characterized in that the positioning and contacting of the electronic components ( 1 ) in the repetitive pattern is conducted automatically.
6. The method as claimed in claim 4 , characterized in that the intermediate position of each successive positioning and contacting process is reached by running over a grid dimension in the repetition pattern.
7. The method as claimed in claim 1 , characterized in that the correcting includes moving at least one probe tip independently from at least one other probe tip.
8. The method as claimed in claim 1 , characterized in that the conducting a first positioning step includes displacing the chuck in at least one of an X-direction and a Y-direction in accordance with a grid dimension of the repetitive pattern.
9. The method as claimed in claim 1 , characterized in that, subsequent to the setting, the method includes performing a remainder of the method without waiting for a thermal equilibration to be reached.
10. The method as claimed in claim 1 , characterized in that the defined temperature is different from an ambient temperature.
11. The method as claimed in claim 1 , characterized in that the defined temperature is a first defined temperature, and subsequent to the testing the first electronic component and prior to the repeating, the method further includes setting the electronic components to a second defined temperature that is different from the first defined temperature.
12. The method as claimed in claim 11 , characterized in that the method further includes performing the repeating without waiting for a thermal equilibration to be reached.