However, injecting the reference clock to a VCO operating in a PLL loop causes a conflict issue, because there are two kinds of phase-aligning forces from the PLL and from the injection. Most of the state-of-the-art works put the ILO into a PLL, rather than letting it free-run . There have been some approaches for the frequency acquisition. First, a frequency acquisition is required due to the limited lock range of an ILO. However, there are a few critical design challenges to overcome. Recently, an injection-locked clock generator (ILCG), based on an injection-locked oscillator (ILO), has been widely studied because of its superior phase noise suppression . IET Generation, Transmission & Distribution.IET Electrical Systems in Transportation.IET Cyber-Physical Systems: Theory & Applications.IET Collaborative Intelligent Manufacturing.CAAI Transactions on Intelligence Technology.
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