Apparatus for hot-probing integrated semiconductor circuits on wafers
View Patent ↗An apparatus for hot-probing integrated semiconductor circuits on wafers is disclosed that includes a support device for accommodating the wafer, a measurement card with electronic circuitry for functional verification of the integrated semiconductor circuits on the wafers, and a test head with contact needles which establishes an electrical contact between the measurement card and the integrated semiconductor circuits, wherein a detachable and coolable shield plate is provided between the measurement card and wafer in order to protect the apparatus.
1. An apparatus for hot-probing integrated semiconductor circuits on wafers, the apparatus comprising:
a support device for accommodating a wafer;
a measurement card having electronic circuitry for functional verification of the integrated semiconductor circuits on the wafers;
a test head connected to the measurement card, the test head having contact needles for establishing an electrical contact between the measurement card and the integrated semiconductor circuits in a test area;
a detachable heat shield plate provided between the measurement card and the wafer, the shield plate including an opening and the test head needles extending into said opening; and
at least one rail fixably provided on the shield pate,
wherein the shield plate is spaced from the measurement card by a gap contiguous with said opening, and
wherein the at least one rail forms a full-area force-locking connection for the measurement card along a lengthwise direction of the shield plate.
2. The apparatus according to claim 1 , wherein the shield plate has an opening for providing contact to the contact needles with the contact areas of the semiconductor circuits.
3. The apparatus according to claim 1 , wherein the shield plate is connected to the measurement card or a frame of the apparatus for hot-probing in a force-locking manner or by a magnetic force connection.
4. The apparatus according to claim 1 , wherein the shield plate has a lateral fastener or rails, and wherein a separation between the shield plate and the measurement card is based on the lateral fastener or rails.
5. The apparatus according to claim 1 , wherein the shield plate has a low coefficient of thermal expansion, which is less than or equal to 11*10 −6 1/K.
6. The apparatus according to claim 1 , wherein the shield plate has an isotropic coefficient of thermal expansion.
7. The apparatus according to claim 1 , wherein the shield plate includes a rib structure that projects out of a surface of the shield plate to stiffen and stabilize the shield plate.
8. The apparatus according to claim 1 , wherein a wind channel for a coolant is provided between the shield plate and the measurement card.
9. The apparatus according to claim 8 , wherein the flow velocity of the coolant is regulated by an electronic controller or by a function of temperature.
10. The apparatus according to claim 8 , wherein at least one nozzle is arranged below the measurement card for introducing the coolant.
11. The apparatus according to claim 10 , wherein nozzles are arranged below the measurement card at substantially equal intervals.
12. The apparatus according to claim 8 , wherein, for targeted delivery of the coolant to the most thermally stressed locations on the shield plate, ribs are provided that form guide channels for the coolant.
13. The apparatus according to claim 1 , wherein a temperature sensor or a platinum element is arranged in a region having the highest thermal stress on the shield plate.
14. The apparatus according to claim 13 , wherein the temperature sensor is connected to the electronic coolant controller by a test pin holder.
15. The apparatus according to claim 14 , wherein the shield plate is secured to a frame of the apparatus by the test pin holder.
16. The apparatus according to claim 15 , wherein the test pin holder has a magnet for securing the shield plate.
17. The apparatus according to claim 16 , wherein the magnet is made of a cobalt-samarium alloy, and is arranged such that it can be screwed into the measurement pin holder.
18. The apparatus according to claim 1 , wherein the shield plate has a metallic layer which is reflective in the infrared wavelength range.
19. The apparatus according to claim 18 , wherein the thickness of the metallic layer is at least 1 μm.
20. The apparatus according to claim 1 , wherein said wafer is a heated wafer.
21. An apparatus for hot-probing integrated semiconductor circuits on wafers, the apparatus comprising:
a support device for accommodating a wafer;
a measurement card having electronic circuitry for functional verification of the integrated semiconductor circuits on the wafers;
a test head connected to the measurement card, the test head having contact needles for establishing an electrical contact between the measurement card and the integrated semiconductor circuits;
a heat shield plate provided between the measurement card and the wafer, the shield plate including an opening and the needles extending into the opening, the shield plate defining with the measurement card a flow path from a fluid source to the opening; and
at least one rail fixably provided on the shield plate, the at least one rail forming a full-area force-locking connection for the measurement card along a lengthwise direction of the shield plate.
22. The apparatus of claim 21 wherein said shield plate includes ridges for directing fluid flowing along said shield plate.
23. The apparatus according to claim 21 , wherein said wafer is a heated wafer.
24. An apparatus for hot-probing integrated semiconductor circuits on wafers, the apparatus comprising:
a measurement card having electronic circuitry for functional verification of integrated semiconductor circuits on the wafers;
a test head connected to the measurement card and including contact needles for establishing an electrical contact between the measurement card and the integrated semiconductor circuits;
a detachable heat shield plate overlying the measurement card and including an opening surrounding the needles; and
at least one rail fixably provided on the shield plate, the at least one rail forming a full-area force-locking connection for the measurement card along a lengthwise direction of the shield plate,
wherein the shield plate at least partially defines a fluid flow path from a fluid source to the opening.
25. The apparatus of claim 24 wherein the fluid flow path is defined by the measurement card and the shield plate.
26. The apparatus of claim 24 wherein the shield plate includes a plurality of ridges for guiding fluid flowing along said shield plate.
27. The apparatus according to claim 24 , wherein said wafer is a heated wafer.