2009•Research & Progress of SSE Solid State ElectronicsRequires access
A High Resolution Sigma-Delta Fractional-N Frequency Synthesizer
Yuepeng Yan
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Abstract
A fractional-N frequency synthesizer with novel dividers is proposed.Compared with traditional fractional-N frequency synthesizer,the design shows good performance of fast settling time,high resolution with maximum working frequencies.The fractional-N frequency synthesizer with 3-order sigma-delta modulator is realized in TSMC 0.25 μm 2.5 V CMOS process.The working frequency is between 2.400 GHz to 2.850 GHz.The measured phase noise is lower than-95 dBc/Hz at 100 kHz offset,with ultra-small step size less than 30 Hz and the switching time of less than 30 μs,which meets the requirements for most wireless communication systems.