Standard CMOS Hall-Sensor with Integrated Interface Electronics for a 3D Compass Sensor

Conference paper (2007)

Authors

JC van der Meer Electronic Instrumentation -

K.A.A. Makinwa Electronic Instrumentation -

J.H. Huijsing Electronic Instrumentation -

FR Riedijk Electronic Instrumentation -

Research Group

Electronic Instrumentation () (TU Delft)

Elektrotechniek Techniek

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Published Date

2007

Language

Undefined/Unknown

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

A smart compass sensor has been developed in standard CMOS with integrated signal conditioning and interface electronics. The compass sensors measure the horizontal components of the earth's magnetic field, which has a typical field strength of 25Â¿T. The sensor's offset is 4Â¿T (3Â¿), and its offset stability is less than 0.25Â¿T/week. Due to this low offset stability, the detection level is only limited by system noise. By using an improved chopper amplifier in the front-end the system noise has been reduced to 0.12Â¿T/Â¿Hz. In order to measure all three components of the earth's magnetic field, each sensor is packaged in a custom SFN8 package, which enables the necessary orthogonal alignment of three sensors. The presented 3D sensor module consists of three daisy-chained sensors, and illustrates the ease-of-use of a smart sensor with integrated bus (SPI/Â¿wire) interface. Apart from a single decoupling capacitor, no external components are necessary to read out the sensor signals, which reduces system costs.