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2000 Sep 06 26
Philips Semiconductors
Magnetoresistive sensors for
magnetic field measurement
General
SENSOR TEMPERATURE DRIFT
The sensitivity of MR sensors is also temperature
dependent, with sensitivity decreasing as temperature
increases (Fig.31).The effect on sensor output is certainly
not negligible, as it can produce a difference of a factor of
three within a −25 °C to +125 °C temperature range, for
fields up to 0.5 kA/m. This effect is not compensated for by
the flipping action described in the last section.
Fig.31 Output voltage ‘V
o
’ as a fraction of the supply voltage for a KMZ10B sensor, as a function of transverse
field ‘H
y
’, at several temperatures.
handbook, full pagewidth
3
0
15
32
2
MLC134
5
10
10
5
15
0
1
1
H (kA/m)
y
V
O
(mV/V)
T = 25 C
amb
o
25 C
o
75 C
o
125 C
o
operating range