一种小型铷原子频标功率稳幅电路

传统的铷原子频标(RAFS)射频电路所采用的饱和输出的方式虽然能稳定射频信号幅度,但是无法稳定射频信号波形,导致微波功率稳定性不够理想.本文介绍了一种铷原子频标微波功率稳幅电路方案,该方案以阶跃恢复二极管(SRD)的偏置电压为参考,通过控制可变增益放大器(VGA)的增益实现自动增益控制(AGC).该方案在控制射频信号幅度的同时亦控制其波形.结果表明该方案能有效改善铷原子频标的微波信号功率的稳定性.

A Circuit to Improve Power Amplitude Stability in Miniature Rubidium Atomic Frequency Standard

The radiofrequency circuit of traditional miniature rubidium atomic frequency standard (RAFS) uses saturated output, which can stabilize the amplitude, but not the waveform, of the radiofrequency signal. This would lead to insufficient microwave power stability. In this study, an improved circuit for stabilizing power amplitude in miniature rubidium atomic frequency standard was described. The circuit took the bias voltage of step recovery diode (SRD) as a reference to achieve automatic gain control (AGC) through controlling the gain of the variable gain amplifier (VGA). This scheme controlled both the amplitude and the waveform of the radiofrequency signal. The results showed that this scheme can effectively improve power stability of the microwave signal in miniature rubidium atomic frequency standard.