A 2.4-GHz ISM Band Delta-Sigma Fractional-N Frequency Synthesizer with Automatic Calibration Technique
نویسندگان
چکیده
In the paper, a programmable phase-locked loop (PLL) based ISM band fractional-N frequency synthesizer, commonly used in wireless communication system, is presented. The third order error-feedback Delta-Sigma modulator and high linearity offset phase frequency detector (PFD)/ Charge Pump (CP) are adopted to reduce close-in phase noise due to ∆Σ quantization noise folding. Automatic calibration technique is also introduced to select the optimal frequency sub-band of voltage controlled oscillator (VCO) automatically through process, voltage and temperature (PVT) variation. The Synthesizer is designed in UMC .18um RF process and has a die size of 1.5mm*2.3mm. The measured phase noise is -112 dBc/Hz at 1 MHz offset. Key-Words: Fractional –N Frequency Synthesizer, Delta-Sigma Modulation, Quantization noise folding, Automatic Calibration Technique
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[1] I. Bietti, E. Ternporitil, G. Albasini, and R. Castello, “An UMTS sigma delta fractional synthesizer with 200 kHz bandwidth and 128 dBc/Hz at 1 MHz using spurs compensation and linearization techniques,” in Proc. IEEE Custom Integrated Circuits Conf., Sep. 2003, pp. 463–466. [2] S. Pamarti, L. Jansson, and I. Galton, “A wideband 2.4-GHz delta-sigma fractional-N PLL with 1-Mb/s in-loop modul...
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