Philips Magnetoresistive Sensor manual KMZ10 and KMZ11 bridge configuration 2000 Sep

Philips Semiconductors

Magnetoresistive sensors for

magnetic field measurement

General

MLC129

RT		RT
4	3	2	1
VCC	VO	GND	VO

In one pair of diagonally opposed elements the barber-poles are at +45˚ to the strip axis, with the second pair at −45˚. A resistance increase in one pair of elements due to an external magnetic field is matched by an equal decrease in resistance of the second pair. The resulting bridge imbalance is then a linear function of the amplitude of the external magnetic field in the plane of the permalloy strips normal to the strip axis.

This layout largely eliminates the effects of ambient variations (e.g. temperature) on the individual elements and also magnifies the degree of bridge imbalance, increasing sensitivity.

Fig 26 indicates two further trimming resistors (RT) which allow the sensors electrical offset to be trimmed down to zero during the production process.

Fig.26 KMZ10 and KMZ11 bridge configuration.

2000 Sep 06 22