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A 2.4-GHz two-point modulation IEEE 802.15.4 (Zigbee) compliant transmitter is presented. This sigma-delta fractional-N PLL based transmitter is optimized for both lowpower and low-cost purposes. A novel closed-loop calibration scheme is proposed to minimize the gain mismatch between two modulation points, which is the main source of error in two-point(More)
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