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A Quantization Noise Suppression Technique for \Delta \Sigma Fractional- N Frequency Synthesizers

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5 Author(s)
Y. -C. Yang ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei ; S. -A. Yu ; Y. -H. Liu ; T. Wang
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The first circuit implementation of quantization noise suppression technique for DeltaSigma fractional- N frequency synthesizers using reduced step size of frequency dividers is presented in this paper. This technique is based on a 1/1.5 divider cell which can reduce the step size of the frequency divider to 0.5 and thus the reduced step size suppresses the quantization noise by 6 dB. This frequency synthesizer is intended for a WLAN 802.11a/WiMAX 802.16e transceiver. This chip is implemented in a 0.18-mum CMOS process and the die size is 1.23 mm times 0.83 mm. The power consumption is 47.8 mW. The in-band phase noise of -100 dBc/Hz at 10 kHz offset and out-of-band phase noise of -124 dBc/Hz at 1MHz offset are measured with a loop bandwidth of 200 kHz. The frequency resolution is less than 1 Hz and the lock time is smaller than 10 mus

Published in:

IEEE Journal of Solid-State Circuits  (Volume:41 ,  Issue: 11 )