Patent ID: 11927604
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. A method of manufacturing a packaged electronic device, the method comprising:
fabricating circuits on or in respective test sites of a wafer;
wafer probe testing the test sites of the wafer, including:
initializing a wafer probe test system to test the wafer that is positioned in a wafer plane of orthogonal first and second directions, including:
measuring a probe needle height along a third direction that is orthogonal to the first and second directions;
using a magnetic sensor of the wafer probe test system, measuring a magnetic field of a rotary magnet rotating about an axis along the third direction at different rotational angles;
calculating a multiplier factor as a ratio between modeling data and the measured magnetic flux density of the magnetic sensor at the respective different rotational angles;
determining an angular offset for respective angular regions of the rotation of the rotary magnet; and

while the rotary magnet rotates, testing magnetic sensing performance of the circuits of the respective test sites of the wafer according to a regression model of magnetic flux density in the first, second and third directions as a function of the rotational angle of the rotary magnet, the probe needle height, measured magnetic flux density of the magnetic sensor; and the angular offset; and wherein the testing comprises calculating magnetic flux density at the respective test sites of the wafer as a function of the rotational angle of the rotary magnet, the probe needle height, the measured magnetic flux density of the magnetic sensor, the angular offset and the multiplier factor;

separating the respective test sites from one another to provide separated semiconductor dies; and
packaging at least some of the separated semiconductor dies to form packaged electronic devices.