Abstract:

 In order to improve magnetic field sensitivity and stability of the high-temperature RF SQUID(Rradio-Frequency Superconducting Quantum Interference Devices) magnetometer, a radio-frequency oscillator used to provide bias signal to resonant circuit of the superconducting quantum interference devices was designed. The voltage-controlled oscillator with adjustable continuously frequency was used as signal source, and radio-frequency signal attenuation circuit used to attenuate oscillation signal to meet the power requirements of the oscillation signal of the SQUID was also designed. The experiments showed that the oscillator can continuously produce adjustable 549.75～947 MHz radio-frequency signal, and the minimum signal power is  -98.97 dBm, which meets the work requirements of the SQUID devices.

Key words: radio-frequency superconducting quantum interference devices (RF SQUID), magnetometer, radio-frequency oscillator, signal attenuating