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Design of 2.87 GHz Frequency Synthesizer with Programmable Sweep for Diamond Color Defect based CMOS Quantum Sensing ApplicationsAuthors: Adithya Sunil Edakkadan,Kasturi Saha,Maryam Shojaei Baghini,Abhishek Srivastava Conference: 2022 IEEE International Symposium on Circuits and Systems (ISCAS) Pages: 1-5 Date: 2022-06-01 Report no: IIIT/TR/2022/10 AbstractRecently, diamond color defect based quantum sensing applications such as nitrogen-vacancy (NV) center magnetometry have emerged in CMOS technology, which use optically detected magnetic resonance (ODMR) for sensing magnetic field strengths (|B˜|) from different environmental physical quantities. For ODMR based sensing, CMOS quantum sensors seek an onchip 2.87 GHz microwave (MW) signal generator. Moreover, in order to sense smaller |B˜|, these CMOS quantum sensors also require that MW signal should be swept with sufficiently small step-size near 2.87 GHz. In this work, we present a fractionalN synthesizer based 2.87 GHz MW-generator (MWG) with an extremely small programmable sweep step-size for improved sensitivity of |B˜| measurements in CMOS NV magnetometry. The proposed MWG is implemented in 180 nm CMOS technology and simulations were done to validate the proposed design. Postlayout simulation results show that the proposed MWG achieves a minimum sweep-step size of 50 kHz, which can be used to sense |B˜| < 0.9 µT and exhibits a phase noise of -114.5 dBc/Hz at an offset of 1 MHz near 2.87 GHz center frequency. Index Terms—Quantum-sensing, nitrogen-vacancy, magnetometry, ODMR, colour-defect, diamond, CMOS, sensitivity Full paper: pdf Centre for VLSI and Embeded Systems Technology |
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