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A Low Jitter Programmable Clock Multiplier Based on a Pulse Injection-Locked Oscillator With a Highly-Digital Tuning Loop

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4 Author(s)
Helal, B.M. ; Massachusetts Inst. of Technol., Cambridge, MA ; Chun-Ming Hsu ; Johnson, K. ; Perrott, M.H.

This paper introduces a pulse injection-locked oscillator (PILO) that provides low jitter clock multiplication of a clean input reference clock. A mostly-digital feedback circuit provides continuous tuning of the oscillator such that its natural frequency is locked to the injected frequency. The proposed system is demonstrated with a prototype consisting of a custom 0.13 mum integrated circuit with active area of 0.4 mm2 and core power of 28.6 mW, along with an FPGA, a discrete DAC and a simple RC filter. Using a low jitter 50 MHz reference input, the PILO prototype generates a 3.2 GHz output with integrated phase noise, reference spur, and estimated deterministic jitter of 130 fs (rms), -63.9 dBc, and 200 fs (peak-to-peak), respectively.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:44 ,  Issue: 5 )