[1] [1] GARDNER A T, COLLINS J A. A second look at chip scale atomic clocks for long term precision timing[C]// IEEE OCEANS2016 MTS/IEEE Monterey. Monterey,CA,USA:IEEE, 2016:1-9. doi:10.1109/OCEANS.2016.7761268.

[3] [3] QIAN Z,CHOI W,MILLER C,et al. A 210-to-305 GHz CMOS receiver for rotational spectroscopy[C]// 2016 IEEE International Solid-State Circuits Conference(ISSCC). San Francisco,CA,USA:IEEE, 2016. doi: 10.1109/ISSCC.2016.7418089.

[4] [4] WANG C,YI X, MAWDSLEY J,et al. An onchip fully electronic molecular clock based on sub-terahertz rotational spectroscopy[J].Nature Electron, 2018,1(7):421-427. doi:10.1038/s41928-018-0102-4.

[5] [5] WANG C, YI X, KIM M, et al. A CMOS molecular clock probing 231.061 GHz rotational line of OCS with sub-ppb long-term stability and 66 mW DC power[C]// Symposia on VLSI Technology and Circuits. Honolulu, Hawaii, USA: [s. n.], 2018. doi: 10.1109/VLSIC.2018.8502271)

[6] [6] WANG B, PERKINS Z, HAN R. Molecular detection for unconcentrated gas with ppm sensitivity using 220 to 320 GHz dualfrequency-comb spectrometer in CMOS[J]. IEEE Transactions on Biomedical Circuits & Systems, 2018,12(3):709-721.