A ∆Σ Fractional-N Frequency Synthesizer with Multi-Band PMOS VCOs for 2.4 and 5GHz WLAN Applications
نویسندگان
چکیده
This paper presents a fully integrated multi-band frequency-synthesizer architecture. The synthesizer is a ∆Σ based fractional-N frequency synthesizer with three on-chip LC tuned VCOs to cover the entire frequency bands specified in IEEE802.11b, and 802.11a WLAN standards. The synthesizer includes a ∆Σ noise shaper, a dead-zone-free phase frequency detector and a fully differential charge pump. The measured in-band phase noise is lower than –93dBc/Hz and the VCO out of band phase noise is -120dBc/Hz at 1MHz offset.
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