Abstract
The paper analyzes the two kinds magnetic field sensor measuring principle based nuclear Zeeman effect, the signal characteristics are analyzed according to the formula of the sensor output signal, the curve of the sensor maximum output signal VS the earth magnetic field obtained by using the method of combination numerical and experimental. With constant output signal amplitude as a criterion, the amplifier which satisfies the characteristic of the sensor output was designed. To further improve the SNR, program controllable self-tracking band pass filter (PCSTBF) was designed based on the switch capacitor filter and the FFT. The results showed that: the SNR was increased by using the amplifier which contains the PCSTBF, and the bandwidth of the output signal was not reduced.
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