Injection Locked Charge-Pump PLL with a Replica of the Ring Oscillator

Jeonghoon HAN  Masaya MIYAHARA  Akira MATSUZAWA  

IEICE TRANSACTIONS on Electronics   Vol.E97-C    No.4    pp.316-324
Publication Date: 2014/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.316
Type of Manuscript: Special Section PAPER (Special Section on Solid-State Circuit Design,---,Architecture, Circuit, Device and Design Methodology)
Injection-lock,  ring oscillator,  lock range,  PLL,  

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This paper derives a maximum lock range of an injection locked ring oscillator in a direct injection method and presents an injection locked charge-pump phase-locked loop (CPPLL) with a replica of a ring oscillator. The proposed injection-locked PLL separates the injection-locked VCO from the continuous phase-tracking loop of the PLL such that can provide stable lock-state maintenance and tolerance to temperature and supply voltage variation. The measurement results show that the proposed injection-locked PLL can be tolerable to voltage variation of 11.2% in supply voltage of 1.2V. In-band noises of the injection-locked oscillator at offset frequencies of 10kHz and 100kHz are -108.2dBc/Hz and -114.6dBc/Hz, respectively.