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This paper proposes the use of N-push operation for combining the functions of the VCO and divider in the mm-wave frequency range. If employed in a PLL, the Combined VCO/Divider (C-VCO/D) would potentially provide wider tuning range than traditional mm-wave PLLs employing injection locked frequency dividers, thus exploiting the full range available in the 60 GHz band (57 GHz - 64 GHz). The behavior of triple push oscillators based on injection locking theory is analyzed to study their various oscillation modes, their stability and the effect of mismatch on the oscillator performance. Design guidelines are provided for boosting the third harmonic power at a given power budget.
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