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2000 Sep 06 9
Philips Semiconductors
Magnetoresistive sensors for
magnetic field measurement
General
Figure 10 is similar to Fig.9, but with the sensor powered
by a constant current supply. Figure 10 shows that, in this
case, the temperature dependency of sensitivity is
significantly reduced. This is a direct result of the increase
in bridge resistance with temperature (see Fig.8), which
partly compensates the fall in sensitivity by increasing the
voltage across the bridge and hence the output voltage.
Figure 8 demonstrates therefore the advantage of
operating with constant current.
Fig.10 Output voltage ‘V
o
’ of a KMZ10B sensor as a function of transverse field ‘H
y
’ for several temperatures.
handbook, full pagewidth
0
75
42
MLC135
25
50
50
25
75
2
0
4
H (kA/m)
y
V
O
(mV/V)
T = 25 C
amb
o
25 C
o
75 C
o
125 C
o
operating range