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Cyclic-coupled ring oscillators (CCRO) provide several unique features over regular ring oscillators such as availability of multiple sets of phase-shifted outputs and reduced phase noise. Furthermore, when combined with N-push frequency multiplication low phase noise, wide tuning ranges and millimeter-wave (mm-wave) frequencies can be realized. In this work, we propose two N-push CCROs fabricated...
A topology for realizing wideband ring oscillators is introduced. Five three-stage ring oscillators operating over a frequency range of 1–2.56GHz are coupled using uni-lateral cyclic coupling. This provides phase shifted outputs which are combined twice in an N-Push or M-Push operation (N=3 and M=5) resulting in an output signal of 3.16–12.8GHz. This coupled structure improves phase noise by 10log...
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