EP0964259A1
Expired / Lapsed
EP
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Magnetic sensor
Assignee: Asahi Kasei Electronics Co Ltd
•
Filing: 1998-02-27
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Granted: —
•
Expires: 2018-02-27
Abstract
Abstract A magnetic sensor with a signal processing circuit includes a magnetic sensor section 4 composed of a compound semiconductor thin film or a magnetic thin film, and a signal processing circuit 5 for amplifying a magnetic signal the magnetic sensor section detects as an electrical output. The signal processing circuit 5 includes an operational amplifier 51 and a constant current circuit 52 for carrying out feedback. The constant current circuit 52 in the signal processing circuit 5 includes a plurality of resistors with two or more different temperature coefficients, and the current output from the constant current circuit has a temperature coefficient inversely proportional to the temperature coefficient of the combined resistance of the plurality of the resistors.
Inventors
- 👤 Kazutoshi Ishibashi
- 👤 Ichiro Shibasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 14:33
CPC Classifications
H; H10; H10N; H10N50/00; G; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/07; G01D; G01D3/00; G01D3/028; G01D3/036
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
A magnetic sensor with a signal processing circuit
characterized by comprising: a magnetic sensor section composed of one of a
compound semiconductor thin film and a magnetic thin
film; and a signal processing circuit for amplifying a
magnetic signal said
magnetic sensor section detects as an electrical
output, wherein said signal processing circuit includes
an operational amplifier and a constant current
circuit for carrying out feedback.
Claim 2
Dependent Claim
43 words
The magnetic sensor with a signal processing
circuit as claimed in claim 1, characterized in that
said constant current circuit feeds a different
current value corresponding to an output of the
operational amplifier back to an non-inverting input
terminal of the operational amplifier.
Claim 3
Dependent Claim
62 words
The magnetic sensor with a signal processing
circuit as claimed in claim 2, characterized in that
said constant current circuit includes a plurality of
resistors with at least two different temperature
coefficients, and the current said constant current
circuit outputs has a temperature coefficient which
is inversely proportional to a temperature coefficient
of a combined resistance of the plurality of the
resistors.
Claim 4
Dependent Claim
53 words
The magnetic sensor with a signal processing
circuit as claimed in claim 3, characterized in that
the combined resistance of the plurality of resistors
has a temperature coefficient that corrects a
temperature coefficient of an internal resistance of
said magnetic sensor section and a temperature
coefficient of sensitivity of said magnetic sensor
section.
Claim 5
Dependent Claim
67 words
The magnetic sensor with a signal processing
circuit as claimed in claim 4, characterized in that
the plurality of resistors have temperature
coefficients that correct not only the temperature
coefficient of the internal resistance of said
magnetic sensor section and the temperature
coefficient of the sensitivity of said magnetic sensor
section, but also a temperature coefficient of an
object to be detected by said magnetic sensor section.
Claim 6
Dependent Claim
27 words
The magnetic sensor with a signal processing
circuit as claimed in any one of claims 1-5,
characterized in that said signal processing circuit
is a monolithic IC.
Claim 7
Dependent Claim
40 words
The magnetic sensor with a signal processing
circuit as claimed in any one of claims 1-5,
characterized in that said signal processing circuit
is formed on one of an insulated substrate and an
insulating layer formed on a semiconductor substrate.
Claim 8
Dependent Claim
37 words
The magnetic sensor with a signal processing
circuit as claimed in claim 6, characterized in that
said signal processing circuit is formed on one of an
insulated substrate and an insulating layer formed on
a semiconductor substrate.
Claim 9
Dependent Claim
84 words
A magnetic sensor with a signal processing circuit
characterized by comprising: a magnetic sensor section composed of one of a
compound semiconductor thin film and a magnetic thin
film; and a signal processing circuit for amplifying a
magnetic signal said magnetic sensor section detects
as an electrical output, wherein said signal processing circuit includes
a plurality of feedback resistors with at least two
different temperature coefficients, and the plurality
of resistors feed an output of an operational amplifier
back to its non-inverting input terminal.
References Cited (Backward Citations)
No citation records indexed.
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