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- W1966327667 abstract "<para xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> A wideband phase-locked loop (PLL)-based G/FSK transmitter (TX) architecture is presented in this paper. In the proposed TX, the G/FSK data is applied outside the loop; hence, the data rate is not constrained by the PLL bandwidth. In addition, the PLL remains locked all the time, preventing the carrier frequency from drifting. In this architecture, the G/FSK modulation signal is generated from a proposed Sigma-Delta modulated Phase Rotator <formula formulatype=inline> <tex Notation=TeX>$(SigmaDelta{hbox{-PR}})$</tex></formula>. By properly combining the multi-phase signals from the PLL output, the <formula formulatype=inline> <tex Notation=TeX>$SigmaDelta{hbox{-PR}}$</tex></formula> effectively operates as a fractional frequency divider, which can synthesize modulation signals with fine-resolution frequencies. The proposed <formula formulatype=inline> <tex Notation=TeX>$SigmaDelta{hbox{-PR}}$</tex></formula> adopts the input signal as the phase transition trigger, facilitating a glitch-free operation. The impact of the <formula formulatype=inline><tex Notation=TeX>$SigmaDelta{hbox{-PR}}$</tex> </formula> on the TX output noise is also analyzed in this paper. The proposed TX with the <formula formulatype=inline><tex Notation=TeX>$SigmaDelta{hbox{-PR}}$</tex> </formula> is digitally programmable and can generate various G/FSK signals for different applications. Fabricated in a 0.18 <formula formulatype=inline> <tex Notation=TeX>$muhbox{m}$</tex></formula> CMOS technology, the proposed TX draws 6.3 mA from a 1.4 V supply, and delivers an output power of <formula formulatype=inline><tex Notation=TeX>$-$</tex></formula>11 dBm. With a maximum data rate of 6 Mb/s, the TX achieves an energy efficiency of 1.5 nJ/bit. </para>" @default.
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- W1966327667 date "2009-09-01" @default.
- W1966327667 modified "2023-10-14" @default.
- W1966327667 title "A Wideband PLL-Based G/FSK Transmitter in 0.18 $mu$m CMOS" @default.
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- W1966327667 doi "https://doi.org/10.1109/jssc.2009.2022994" @default.
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