Our recent work on Low-Supply Sensitivity LC VCOs with Complementary Varactors is accepted for publication as a regular paper in the IEEE Transactions on Very Large Scale Integration Systems. 

28-Apr-2020

Dear Prof. Gui,

On behalf of the editorial board of TVLSI, we are pleased to inform you that your paper, "Low-Supply Sensitivity LC VCOs with Complementary Varactors TVLSI-00064-2020.R1," has been accepted for publication as a  Regular Paper in the IEEE Transactions on Very Large Scale Integration Systems.   

Abstract—The effects of supply-induced frequency variations on single-ended tuning LC VCO which degrade the  jitter  performance of the clock are investigated. The first-order impact on the supply sensitivity is that  the varactor’s  effective capacitance varies with the supply voltage, with other second-order impacts  attributed to commonly used  capacitive bank and cross-coupled pairs. A compensation technique based on  complementary varactors to improve the  supply sensitivity of single-ended tuning LC VCO is proposed with no  extra power dissipation, nor phase noise  degradation within the relative frequency band of interest, along  with the discussion on the operating principle of  the compensation technique. Both the NMOS cross-coupled and complementary cross-coupled LC VCOs have been designed,  demonstrating robust supply-insensitive performance  over process, voltage and temperature (PVT) variations.  Prototyped oscillators were fabricated in a 0.18-um  CMOS process to verify both the theoretical analysis and the  effectiveness of the proposed technique.  Measurement results show that the compensated topologies exhibit more than  93% reduction in periodic jitter versus the non-compensated counterparts, with the figures of merit (FoMs) among the  best compared with  previous supply insensitive works.