System for sensing changes in a magnetic field

Details System for sensing changes in a magnetic field System for sensing changes in a magnetic field

1990-11-06

1991-08-06

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Magnetic field or compass

338 32H, 32420721, H01L 4300

Patent

active

050381300

ABSTRACT:
All of the resistors in a magnetic field sensitive circuit, both magnetoresistors (MRs) and fixed resistors (FRs), are formed simultaneously in a common fabrication process from a common magentoresistive material. An additional structure in the form of Hall shorting strips is applied to selected resistors to rendered them MRs, while the resistors without the additional structure function as FRs. In one circuit the resistors are arranged in pairs in two voltage divider circuits. The high voltage resistor for one circuit and the low voltage resistor from the other circuit are MRs while the remaining resistors are FRs, producing an increased magnetic sensitivity. In another circuit all resistors are MRs and are positioned so that the magentic field at one pair swings in a direction opposite to that of the other pair, further increasing the magnetic sensitivity. Discrepancies stemming from temperature coefficient mismatch and manufacturing variations are substantially reduced.

REFERENCES:
patent: 4079360 (1978-03-01), Ookobo et al.
patent: 4251795 (1981-02-01), Shibasaki et al.
patent: 4361805 (1982-11-01), Narimatsu et al.
patent: 4401966 (1983-08-01), Ohmura et al.
patent: 4492922 (1985-01-01), Ohkubo
patent: 4853632 (1989-08-01), Nagano et al.
patent: 4978938 (1990-12-01), Partin et al.

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