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- W2784131727 abstract "A wideband Σ-Δ fractional-N PLL with adaptive frequency calibration (AFC) circuit is presented in this paper. The proposed PLL is designed to cover the frequency bands of IEEE802.11 a/b/g and GPS. The oscillator core in the PLL can generate quadrature signals with frequencies from 4.8 to 5.8 GHz. Two prescaler dividers, divide-by-2 and divide-by-3, are introduced in parallel to divide the oscillation frequency down to IEEE802.11 b/g band at 2.4 GHz and GPS band at 1.5 GHz simultaneously. A 12-bit Σ-Δ modulator is used for generating fractional dividing ratio to achieve fine frequency step so as to be able to use a fixed reference frequency source. The measured phase noise at 1 MHz offset is lower than −122 dBc/Hz across the entire frequency band from 4.8 to 5.8 GHz. The measured reference and fractional spurs are less than −45 dBc and −50 dBc, respectively. The settling time of the proposed PLL is less than 338 us in a 160 MHz frequency jump. The entire PLL circuit consumes 91.5 mW under 1.8V power supply." @default.
- W2784131727 created "2018-01-26" @default.
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- W2784131727 date "2017-11-01" @default.
- W2784131727 modified "2023-09-22" @default.
- W2784131727 title "A multiband fractional-N PLL for IEEE802.11 a/b/g and GPS applications" @default.
- W2784131727 doi "https://doi.org/10.1109/apmc.2017.8251612" @default.
- W2784131727 hasPublicationYear "2017" @default.
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