Probe station thermal chuck with shielding for capacitive current
First Claim
Patent Images
1. A thermal chuck including a surface for supporting a device under test, said thermal chuck comprising:
- (a) an electrically powered thermal unit for modifying a temperature of said surface; and
(b) a first conductive member substantially enclosing said thermal unit and including a portion separating said thermal unit from said surface.
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Abstract
To reduce the time to make measurements and the noise in measurements obtained by probing a device supported on surface of a thermal chuck in a probe station, a conductive member is arranged to intercept current coupling the thermal unit of the chuck to the surface supporting the device. The conductive member is capacitively coupled to the thermal unit but free of direct electrical connection thereto.
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Citations
19 Claims
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1. A thermal chuck including a surface for supporting a device under test, said thermal chuck comprising:
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(a) an electrically powered thermal unit for modifying a temperature of said surface; and (b) a first conductive member substantially enclosing said thermal unit and including a portion separating said thermal unit from said surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of reducing a time for making a probing measurement of a device under test supported on a surface of a chuck, said chuck comprising a dielectric and a thermal unit for modifying a temperature of said surface, said method comprising:
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(a) substantially enclosing said thermal unit with a conductive member, said conductive member including a surface interposed between said thermal unit and said surface of said chuck; and (b) conductively connecting said conductive member to a controller supplying electric power to said thermal unit. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A probe station comprising:
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(a) a thermal chuck including a surface for supporting a device under test and an electrically powered thermal unit for modifying a temperature of said surface; and (b) a conductive member substantially enclosing at least one of said surface and said thermal unit and including a portion separating said surface and said thermal unit. - View Dependent Claims (16, 17, 18, 19)
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Specification