A PLL Exploiting Sub-Sampling of the VCO Output to Reduce In-band Phase Noise


Gao, Xiang and Klumperink, Eric A.M. and Boshali, Mounir and Nauta, Bram (2009) A PLL Exploiting Sub-Sampling of the VCO Output to Reduce In-band Phase Noise. In: ProRISC 2009, Annual Workshop on Circuits, Systems and Signal Processing, 26-27 Nov 2009, Veldhoven, the Netherlands.

Abstract:Abstract— In this paper, we present a 2.2-GHz low jitter PLL based on sub-sampling. It uses a phase-detector/charge-pump (PD/CP) that sub-samples the VCO output with the reference clock. In contrast to what happens in a classical PLL, the PD/CP noise is not multiplied by N2 in this sub-sampling PLL. Moreover, no frequency divider is needed in the locked state and hence divider noise and power can be eliminated. A frequency locked loop guarantees correct frequency locking without degenerating jitter performance. The PLL implemented in a standard 0.18-μm CMOS process consumes 4.2 mA from a 1.8 V supply and occupies an active area of 0.4 × 0.45 mm2. The in-band phase noise at 200 kHz offset is measured to be -126 dBc/Hz and the rms PLL output jitter integrated from 10 kHz to 40 MHz is 0.15 ps.
Item Type:Conference or Workshop Item
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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