Abstract
In physical, technical and biological systems measurements of weak magnetic fields are of great importance. A highly sensitive magnetic sensor with a frequency output signal for robust information transmission is presented. It consists of a tuned r.f. oscillator the frequency of which is determined by a weak external magnetic field in the magnetic range of picotesla to microtesla (a magnetically controlled oscillator, MCO). This low-noise magnetic-field-to-frequency converter with a large bandwidth ( > 200 kHz at −3 dB) is very simple in construction, relatively cheap in production and shows a sensitivity of more than 200 GHz T −1. It is suitable for a magnetic readout system or an integrated magnetic sensor array, especially for high-frequency magnetic heads, navigation applications and for geomagnetic measurements.
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