Publication Details
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Nereo Markulic, Kuba Raczkowski, Piet Wambacq, Jan Craninckx
 

Chapter in Book/ Report/ Conference proceeding

Abstract 

The paper presents a subsampling PLL which uses a 10-bit, 0.5 ps unit step Digital-to-Time Converter (DTC) in the phase-error comparison path for the fractional-N lock. The gain and nonlinearity of the DTC can be digitally calibrated in the background while the PLL operates normally. During fractional multiplication of a 40 MHz reference to frequencies around 10 GHz, the measured jitter is in the range from 176 to 198 fs. The worst measured fractional spur is -57 dBc and the in-band phase noise performance of the PLL is -108 dBc/Hz. The presented analog PLL in advanced 28 nm CMOS achieves a figure-of-merit (FOM) of -246.6 dB that compares well to the recent state-of-the-art.

Reference 
 
 
DOI