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This paper proposes a novel Gm-C loop filter instead of a conventional passive loop filter used in a phase-locked loop.The innovative advantage of the proposed architecture is tunable loop filter bandwidth and hence the process variations of passive elements of resistance R and capacitance C can be overcome and the chip area is greatly reduced.Furthermore,the MASH 1-1-1 sigma-delta(Σ▽) modulator is adopted for performing the fractional division number and hence improves the phase noise as well.Measured results show that the locked phase noise is 114.1 dBc/Hz with lower G m-C bandwidth and 111.7 dBm/C with higher G m-C bandwidth at 1 MHz offset from carrier of 5.68 GHz.Including pads and built-in Gm-C filter,the chip area of the proposed frequency synthesizer is 1.06 mm 2.The output power is 8.69 dBm at 5.68 GHz and consumes 56 mW with an off-chip buffer from 1.8-V supply voltage.
This paper proposes a novel Gm-C loop filter instead of a conventional passive loop filter used in a phase-locked loop. The innovative advantage of the proposed architecture is tunable loop filter bandwidth and hence the process variations of passive elements of resistance R and capacitance The MASH 1-1-1 sigma-delta (Σ ▽) modulator is adopted for performing the fractional division number and hence improves the phase noise as well. Measured results show that the locked phase noise is 114.1 dBc / Hz with lower G mC bandwidth and 111.7 dBm / C with higher G mC bandwidth at 1 MHz offset from carrier of 5.68 GHz. Including pads and built-in Gm-C filter, the chip area of the The proposed frequency synthesizer is 1.06 mm 2. The output power is 8.69 dBm at 5.68 GHz and consumes 56 mW with an off-chip buffer from 1.8-V supply voltage.