Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1995-01-25
1996-01-30
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
32420712, 324225, 327511, 327513, G01R 3307, H01L 4306, H03K 1790
Patent
active
054882966
ABSTRACT:
A magnetic detection circuit is provided which creates a reference signal that varies with temperature in a manner that is generally identical to the temperature induced variation of a Hall element. By providing a temperature sensitive reference signal, the Hall output signal can be compared to the reference signal without errors being induced by temperature change. One embodiment of the present invention provides a first resistor connected in parallel with the diode which, in turn, is connected between a Hall cell and a point of ground potential. Another embodiment of the present invention comprises a second resistor that is connected in series with the first resistor and in parallel with the Hall cell. Another embodiment of the present invention also incorporates a temperature sensitive resistor that is made of the same material as the Hall cell and used in conjunction with a trimmable resistor to provide inputs to an operational amplifier.
REFERENCES:
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patent: 4449081 (1984-05-01), Doemen
patent: 4521727 (1985-06-01), Atherton et al.
patent: 4646014 (1987-02-01), Eulenberg
patent: 4857842 (1989-08-01), Sturman et al.
patent: 4914387 (1990-04-01), Santos
patent: 5055768 (1991-10-01), Plagens
patent: 5231351 (1993-07-01), Kordts et al.
Digital Gaussmeter Model 660, Bell Inc. Brochure. Form No. DIG566.
Honeywell Inc.
Lanyi William D.
Strecker Gerard R.
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