A Low-Spur CMOS PLL Using Differential Compensation Scheme

作者：Yun Seok Ju^*; Kim Kwi Dong; Kwon Jong Kee

来源：ETRI Journal, 2012, 34(4): 518-526.

DOI：10.4218/etrij.12.0111.0417

• Phase-locked loop (PLL)
• differentially-tuned
• CMOS
• voltage-controlled oscillator (VCO)
• spur rejection
• transformer
• integrated circuit design

This paper proposes LC voltage-controlled oscillator (VCO) phase-locked loop (PLL) and ring-VCO PLL topologies with low-phase noise. Differential control loops are used for the PLL locking through a symmetrical transformer-resonator or bilaterally controlled varactor pair. A differential compensation mechanism suppresses out-band spurious tones. The prototypes of the proposed PLL are implemented in a CMOS 65-nm or 45-nm process. The measured results of the LC-VCO PLL show operation frequencies of 3.5 GHz to 5.6 GHz, a phase noise of -118 dBc/Hz at a 1 MHz offset, and a spur rejection of 66 dBc, while dissipating 3.2 mA at a 1 V supply. The ring-VCO PLL shows a phase noise of -95 dBc/Hz at a 1 MHz offset, operation frequencies of 1.2 GHz to 2.04 GHz, and a spur rejection of 59 dBc, while dissipating 5.4 mA at a 1.1 V supply.

• 出版日期2012-8