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A low-noise 8.95∼11GHz all digital frequency synthesizer (ADPLL) with a metastability-free first-order noise shaping time-to-digital converter (TDC) and a high frequency resolution digitally controlled oscillator (DCO) is presented. An input stage for TDC is proposed to solve the problem of metastability and a specific technique is used to power down the high speed counter as soon as the ADPLL is...
A 6-GHz low-phase-noise voltage-controlled oscillator (VCO) is proposed. A varactor based coarse tuning method which differs from the traditional switch-capacitor based architecture is adopted. The source feedback resistors and a modified filtering technique are used to suppress low and high frequency noises of current source, respectively. To verify the concept, a prototype VCO is fabricated in 0...
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