Sigma-delta modulation technique for low noise fractional-N frequency synthesizer


The fractional-N frequency synthesis technique provides agile switching in narrow channel spacing systems and alleviates phase-locked loop (PLL) design constraints for phase noise and reference spur. A sigma-delta fractional-N frequency synthesizer (FS) achieves the phase noise performance using a spur supression method. A sigma-delta modulator is… (More)


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