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A 1‐V 2.4 GHz low‐spur phase‐locked loop (PLL) fractional‐N frequency synthesizer with a subsampling charge pump and a randomly selected phase frequency detector is implemented by TSMC 0.18‐μm CMOS process. The proposed frequency synthesizer randomizes the periodic ripples on the controlled voltage from the voltage‐controlled oscillator to reduce the reference spur at the output of the PLL. A random...
A 5.6-GHz 1-V wide tuning range frequency synthesizer with a gain-boosting Colpitts voltage-controlled oscillator (VCO) is fabricated in TSMC 0.18 um CMOS process. In this prototype, there are two important features. First, a 1-V gain-boosting Colpitts LC VCO circuit is adopted to reduce phase noise and power consumption. Second, a class-AB current mode logic (CML) circuit is utilized in first divider...
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