We report a novel compact CMOS sensor enabling the measurement of both in-plane magnetic field components B x and B y at the same location. The sensor consists of four nwells arranged essentially as a square and electrically interconnected into a conducting loop. Four contacts, one at the center of each n-well, serve as drive and sense contacts. The sensing principle is the same as in established vertical Hall sensors. By selectively switching the interconnections among the n-wells, the device is made sensitive alternatingly to B x and B y . The sensitivity for both directions is about 5.6 mV/VT. At a nominal B field of 3.7 mT the RMS error of the measured magnitude and angle of B are 56 µT and 0.8°, respectively.

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