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A compact, low power and global-mismatch-tolerant 0.8-6 GHz fractional-N PLL is designed to cover IEEE 802.11abg, PCS/DCS and cellular bands. Two new techniques are proposed to cancel the in-band quantization noise and fractional spurs. Firstly, a second order binary-weighted digital/analog differentiator (DAD) is utilized to enable the second order mismatch shaping and reduce the quantization noise...
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