Patent ID: 11971316
Assignee: ROBERT BOSCH GMBH
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A method for determining a direction-dependent item of stress and/or strain information for at least one sensor position of a semiconductor device, the method comprising the following steps:
arranging at least one stress and/or strain measurement cell including a reference contact, a sensor contact, and a first current mirror circuit integrated into a semiconductor material and having a first conduction path connectable or connected to the reference contact and a second conduction path connectable or connected to the sensor contact, the first conduction path of the first current mirror circuit including at least one first transistor and the second conduction path of the first current mirror circuit including at least one second transistor, wherein a first gate terminal of the first transistor, a first drain terminal of the first transistor, and a second gate terminal of the second transistor, are at an identical potential, and wherein a first crystal direction of the semiconductor material oriented perpendicular to a first inversion channel of the first transistor is definable for the first inversion channel, and a second crystal direction of the semiconductor material oriented perpendicular to a second inversion channel of the second transistor is definable for the second inversion channel and the first crystal direction of the semiconductor material is inclined relative to the second crystal direction of the semiconductor material, in such a manner that, at least at the sensor position, the semiconductor material of the stress and/or strain measurement cell is located on and/or in the semiconductor device at the sensor position; and
determining the direction-dependent item of stress and/or strain information for at least the sensor position of the stress and/or strain measurement cell at least based on a reference current signal provided at the reference contact of the stress and/or strain measurement cell and a sensor current signal provided at the sensor contact of the stress and/or strain measurement cell,
wherein the first conduction path of the first current mirror circuit further includes a third transistor connected to the first drain terminal of the first transistor, and the second conduction path of the first current mirror circuit further includes a fourth transistor connected to a second drain terminal of the second transistor, and wherein a third gate terminal of the third transistor, a third drain terminal of the third transistor and a fourth gate terminal of the fourth transistor are at an identical potential,
wherein a third crystal direction of the semiconductor material oriented perpendicular to a third inversion channel of the third transistor, which is also oriented perpendicular to a fourth inversion channel of the fourth transistor, is definable for the third inversion channel.