高温RF SQUID磁力仪射频振荡器

Radio-Frequency Oscillator for HTS RF SQUID Magnetometer

为了提高高温射频超导量子干涉器（RF SQUID： Radio-Frequency Superconducting Quantum Interference Device）磁力仪的磁场灵敏度和稳定性，设计了提供超导量子干涉器谐振回路偏置信号的射频振荡器。该振荡器采用频率连续可调的压控振荡器作为信号源，结合射频信号衰减电路产生SQUID器件所需功率的振荡信号。实验结果表明，该振荡器能产生549．75～947MHz连续可调的射频信号，信号功率最低可达-98．97dBm，满足SQUID器件的工作要求。

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-frequen- cy 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.