An RF Circuit for Overhauser Magnetometer Excitation

Overhauser magnetometer is a device for magetostatic field measurement, RF excitation is necessary for nitrogen oxygen free radical solution. In this paper, design methods coupled with simulations of a RF circuits used in Overhauser magnetometer are presented. Functionally, a RF circuit consists of three parts, namely RF signal source, RF power amplifier and the load. Generation of a 70MHz RF signal will be described. Power amplification aimed to acquire the gain of 13-16dB will be presented. Finally we get a continuous sine wave of 70MHz, 4-5W. We have validated that a linear polarization magnetic field is successfully generated inside the birdcage coil which meets the requirements of the Overhauser magnetometer. In this paper a number of conclusions are based on RF circuit simulation software ADS.