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A differential coupled frequency doubling voltage-controlled crystal oscillator in a 0.35 μm CMOS process

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Abstract

This paper presents a high-performance differential coupled frequency doubling voltage-controlled crystal oscillator (VCXO). Frequency doubling and low phase noise are realized through a novel gm-boosted differential Colpitts oscillator. Distributed varactor arrays are used to obtain wide frequency tuning range and high tuning linearity simultaneously. The proposed VCXO is fabricated in a 0.35 μm 2P3M standard complementary metal-oxide semiconductor process at a supply voltage of 3.3 V, and the power dissipation is 7 mW. Measurement results show that the designed VCXO achieves ±135 ppm output frequency variation range with 5 % linearity and −133 dBc/Hz phase noise at 1 kHz frequency offset by using a 40 MHz fundamental AT-cut crystal resonator.

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Acknowledgments

This work was supported by the National Basic Research Program of China (973 Program) and the National Natural Science Foundation of China (Grant Nos. 61350007 and 61234003).

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Authors and Affiliations

  1. School of Physics and Electronics, Hunan University, Changsha, 410082, China

    Yanjun Yang & Yun Zeng

  2. Institute of Microelectronics of China Academy of Science, Beijing, 100029, China

    Jie Chen

Authors
  1. Yanjun Yang
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  2. Yun Zeng
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  3. Jie Chen
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Correspondence to Yanjun Yang.

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Yang, Y., Zeng, Y. & Chen, J. A differential coupled frequency doubling voltage-controlled crystal oscillator in a 0.35 μm CMOS process. Analog Integr Circ Sig Process 83, 195–202 (2015). https://doi.org/10.1007/s10470-015-0529-8

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  • DOI: https://doi.org/10.1007/s10470-015-0529-8

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