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This paper reports a high resolution LC-based digitally controlled oscillator (DCO) using novel quadruple resolution varactor. Proposed DCO has a high frequency resolution and a wide tuning range of 2.2 GHz with a low phase noise at 5.6 GHz. A process and temperature invariant quadruple resolution varactor is proposed to achieve the finest frequency resolution. The proposed varactor achieves one fourth...
A fully-digital frequency synthesizer for RF wireless applications has recently been proposed. It replaces the conventional VCO with a digitally-controlled oscillator with sufficiently fine frequency resolution. The conventional phase/frequency detector, charge pump and RC loop filter are replaced by a time-to-digital converter and a simple digital loop filter. In this paper, we present novel techniques...
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