Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1996-09-17
1998-09-01
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324251, 327510, G01R 3302, G01R 3306, H01L 2722
Patent
active
058015337
ABSTRACT:
Cascode coupled magnetic field effect transistors used to measure magnetic field. The disclosed cascode coupled MagFET circuit includes cascode coupled transistors used to equalize the voltage at the drains of the MagFET resulting in a differential Hall current. The cascode devices are biased at a state of very weak inversion to maximize input impedance. The differential currents are amplified with an active current mirror load coupled to the cascode configured devices. A comparator is used to sense the differential currents. The reference voltages used to bias the MagFET and the cascode coupled devices are generated with a bias network including a MagFET precisely matched with the MagFET used to measure the magnetic field such that the magnetic field measuring circuit is exceptionally immune to variations in process, temperature and supply voltage.
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Intel Corporation
Strecker Gerard R.
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