Method of designing a probe card apparatus with desired compliance characteristics
View Patent ↗A probe card apparatus is configured to have a desired overall amount of compliance. The compliance of the probes of the probe card apparatus is determined, and an additional, predetermined amount of compliance is designed into the probe card apparatus so that the sum of the additional compliance and the compliance of the probes total the overall desired compliance of the probe card apparatus.
1. A probe card apparatus having a preselected amount of total compliance, said probe card apparatus comprising:
a plurality of probes configured to contact an electronic device to be tested, said plurality of probes having a first amount of compliance; and
compliance means for providing within said probe card apparatus a selected additional amount of compliance,
wherein said preselected amount of total compliance is a sum of said first amount of compliance and said selected additional amount of compliance, wherein:
said first amount of compliance corresponds to a first spring constant, which is a first ratio of force to deflection,
said additional amount of compliance corresponds to a second spring constant, which is a second ratio of force to deflection, and
a given amount of force displaces said probes a distance that corresponds to a sum of said first spring constant and said second spring constant.
2. The probe card apparatus of claim 1 , wherein said sum corresponds to an inverse of a mathematical addition of an inverse of said first spring constant and an inverse of said second spring constant.
3. The probe card apparatus of claim 2 , wherein said second spring constant is greater than said first spring constant.
4. The probe card apparatus of claim 2 , wherein said spring constant of said plurality of probes comprises a sum of individual compliances of each of said probes, and wherein said individual compliances of each of said probes are independent one from another.
5. The probe card apparatus of claim 1 , wherein said probe card apparatus further comprises:
a probe substrate to which said probes are attached;
an interface board comprising an interface for test signals, said probe substrate being connected to said interface board; and
a mounting mechanism configured to attach said probe card apparatus to a housing.
6. The probe card apparatus of claim 5 , wherein said compliance means is disposed between said probe substrate and said interface board.
7. The probe card apparatus of claim 6 , wherein said compliance means comprises a compliant material.
8. The probe card apparatus of claim 7 , wherein said compliant material is configured to have said second spring constant.
9. The probe card apparatus of claim 6 , wherein said compliance means comprises spring mechanisms.
10. The probe card apparatus of claim 6 , wherein said compliance means comprises spring interconnection elements interconnecting said probe substrate and said interface board.
11. The probe card apparatus of claim 6 , wherein said compliance means comprises plunger springs.
12. The probe card apparatus of claim 6 , wherein said compliance means comprises an interposer.
13. The probe card apparatus of claim 5 , wherein said compliance means comprises said interface board.
14. The probe card apparatus of claim 13 , wherein said interface board is configured to have said second spring constant.
15. The probe card apparatus of claim 5 , wherein said compliance means comprises said probe substrate.
16. The probe card apparatus of claim 5 , wherein said compliance means comprises said mounting mechanism.
17. The probe card apparatus of claim 5 , wherein said compliance means comprises a compliant material disposed between said interface board and hardware for mounting said interface board to said housing.
18. The probe card apparatus of claim 17 , wherein said complaint material is configured to have said second spring constant.
19. A probe card apparatus having a preselected amount of total compliance, said probe card apparatus comprising:
a plurality of probes configured to contact an electronic device to be tested, said plurality of probes having a first amount of compliance; and
compliance means for providing within said probe card apparatus a selected additional amount of compliance,
wherein said preselected amount of total compliance is a sum of said first amount of compliance and said selected additional amount of compliance, wherein:
said total amount of compliance corresponds to a desired over travel of said probes,
said first amount of compliance corresponds to an allowable deflection of said probes, and
said additional amount of compliance corresponds to a deflection of said probe card apparatus.
20. A probe card apparatus having a preselected amount of total compliance, said probe card apparatus comprising:
a plurality of probes configured to contact an electronic device to be tested, said plurality of probes having a first amount of compliance;
compliance means for providing within said probe card apparatus a selected additional amount of compliance, wherein said preselected amount of total compliance is a sum of said first amount of compliance and said selected additional amount of compliance; and
means for adjusting a planarity of contact portions of said probes with respect to terminals of an electronic device to be tested.
21. A probe card apparatus having a preselected amount of total compliance, said probe card apparatus comprising:
a plurality of probes configured to contact an electronic device to be tested, said plurality of probes having a first amount of compliance; and
compliance means for providing within said probe card apparatus a selected additional amount of compliance,
wherein said preselected amount of total compliance is a sum of said first amount of compliance and said selected additional amount of compliance, wherein said total compliance is configured to respond to said electronic device being pressed against said probes and moved an over travel distance past first contact with said probes.