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A wideband sigma-delta phase-locked-loop modulator for wireless applications

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2 Author(s)
Fahim, A.M. ; Electr. & Comput. Eng. Dept., Univ. of Waterlooo, Waterloo, Ont., Canada ; Elmasry, M.I.

A wideband phase-locked-loop (PLL) modulator for wireless applications is reported. This modulator is based on PLL fractional-N frequency synthesis techniques along with sigma-delta modulation to randomize fractional-N spurs. A modified sigma-delta function allows for suppression of sigma-delta noise at lower frequencies, and hence allows for wider loop bandwidth. Also, sigma-delta quantization noise is reduced by using fractional division ratios. Low-power and low-area algorithmic techniques are used in the modified sigma-delta modulator in order to make it a feasible option. It is shown that the resulting modulator meets the GSM specifications and has a total power consumption of 2 mW at 1-GHz operation.

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:50 ,  Issue: 2 )