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A novel voltage controlled oscillator (VCO) sub-band selection circuit to achieve fast phase locked loop (PLL) calibration is presented, which reduces the calibration time by measuring the period difference directly and accomplishing an efficient search for an optimum VCO sub-band. The sub-band selection circuit was implemented in a 0.18 μm CMOS logic process with a PLL using an 8 sub-band VCO. The measured calibration time is less than 3 μs in a VCO frequency range from 600 MHz to 2 GHz. The proposed circuit consumes 0.64 mA at most.
A novel voltage controlled oscillator (VCO) sub-band selection circuit to achieve fast phase locked loop (PLL) calibration is presented, which reduces the calibration time by measuring the period difference directly and accomplishing an efficient search for an optimum VCO sub-band. The sub-band selection circuit was implemented in a 0.18 μm CMOS logic process with a PLL using an 8 sub-band VCO. The proposed calibration time is less than 3 μs in a VCO frequency range from 600 MHz to 2 GHz. The proposed circuit consumes 0.64 mA at most.