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

Claim 8:
9. A method of manufacturing an electronic device, the method comprising:
initializing a wafer probe test system to test a 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 measured magnetic flux density of the magnetic sensor at the respective different rotational angles; and
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 circuits of respective test sites of the wafer according to a model of magnetic flux density in the first, second and third directions at the respective test sites of the wafer as a function of the rotational angle of the rotary magnet, the probe needle height and the measured magnetic flux density of the magnetic sensor, and the angular offset;
wherein the model of magnetic flux density at the test sites of the wafer is a regression model having model parameters for magnetic flux density in the first, second and third directions as a function of the rotational angle of the rotary magnet for each of the respective test sites of the wafer; and
wherein testing the magnetic sensing performance of the circuits of the respective test sites of the wafer 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.