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The rubidium atomic clock based on coherent population trapping (CPT) has advantages of low power consumption, small size and quick start-up. It is potential to be applied in many fields of science. The rubidium atomic clock requires a microwave signal source whose center frequency is 3.417GHz (half of the rubidium atomic hyperfine energy difference) with the ability to be tuned during a certain frequency...
This paper presents the design of a direct-injection divide-by-3 frequency divider operating at the -band. The divider is implemented in a 0.18- CMOS process. The measured free-running frequency of the divider is 7.96 GHz. By utilizing a floating-source differential injector and without a varactor tuning in the divider core, the total locking range is 3.2 GHz with a power consumption...
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