为进一步实现原子钟的低功耗、微型化，设计了一种用于 85Rb原子钟的专用射频模块芯片。该芯片采用了交叉耦合差分结构，利用串联的平面集成螺旋电感达到 3 GHz的输出频率，同时采用了累积型 MOS变容管，实现控制电压对于输出频率的单调调节。最终对设计芯片进行了仿真测试，并完成了流片与封装，基本达到了设计指标。

A dedicated RF module for 85Rb atomic clock chip is designed in order to implement a low power and miniature atomic clocks. The structure of 85Rb atomic clock chip dedicated RF modules is described. The chip employs a cross-coupled differential structure, and utilizes planar integrated spiral inductor in series to ensure the output frequency can reach 3 GHz. The chip uses the accumulation mode MOS varactors, and realizes the monotone adjustment on the output frequency by controlling the voltage. The simulation test is performed on the chip, then the flow sheet and packing are completed. The results basically reach the design specifications.