Fig. 1.
IL RVCO topology
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| Citation: |
Weilin Xu, Di Wu, Xueming Wei, Baolin Wei, Jihai Duan, Fadi Gui. Low-noise sub-harmonic injection locked multiloop ring oscillator[J]. Journal of Semiconductors, 2016, 37(9): 095004. doi: 10.1088/1674-4926/37/9/095004
W L Xu, D Wu, X M Wei, B L Wei, J H Duan, F D Gui. Low-noise sub-harmonic injection locked multiloop ring oscillator[J]. J. Semicond., 2016, 37(9): 095004. doi: 10.1088/1674-4926/37/9/095004.
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Low-noise sub-harmonic injection locked multiloop ring oscillator
doi: 10.1088/1674-4926/37/9/095004
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Abstract
A three-stage differential voltage-controlled ring oscillator is presented for wide-tuning and low-phase noise requirement of clock and data recovery circuit in ultra wideband (UWB) wireless body area network. To improve the performance of phase noise of delay cell with coarse and fine frequency tuning, injection locked technology together with pseudo differential architecture are adopted. In addition, a multiloop is employed for frequency boosting. Two RVCOs, the standard RVCO without the IL block and the proposed IL RVCO, were fabricated in SMIC 0.18 μm 1P6M Salicide CMOS process. The proposed IL RVCO exhibits a measured phase noise of -112.37 dBc/Hz at 1 MHz offset from the center frequency of 1 GHz, while dissipating a current of 8 mA excluding the buffer from a 1.8-V supply voltage. It shows a 16.07 dB phase noise improvement at 1 MHz offset compared to the standard topology.-
Keywords:
- ring VCO,
- injection-locked,
- multiloop,
- frequency tuning
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References
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