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A fully-integrated fractional-N synthesizer (FNS) is designed and implemented, for a single-chip UHF transceiver, using 1P6M 0.18-μm RF CMOS process. The synthesizer provides very low phase-noise and extremely low reference spur RF source covering 880MHz to 1260MHz, incorporating on-chip active loop-filter and dual-stage charge-pump circuits. The measured phase-noise is -116dBc/Hz at 200KHz offset...
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