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2009•Unpublished venueRequires access

A 5.5mA 2.4-GHz two-point modulation Zigbee transmitter with modulation gain calibration

Rui Yu, Theng-Tee Yeo, Kwang-Hung Tan, Shouxian Mou, Yike Cui, Haifeng F. Wang, Hwa-Seng Yap, Eugene Ting, Masaaki ITOH

Open publisher page 23 citations

Abstract

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 low-power 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 modulation. Fabricated in a 0.15-mum CMOS process, the proposed transmitter achieves EVM less than 8% for 2-Mchips/s MSK modulated signal and consumes 5.5 mA under a 1.55-V regulated power supply. The core area is 0.8 times 1.1 mm2.

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What this paper is about

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 low-power 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 modulation. Fabricated in a 0.15-mum CMOS process, the proposed transmitter achieves EVM less than 8% for 2-Mchips/s MSK modulated signal and consumes 5.5 mA under a 1.55-V regulated power supply. The core area is 0.8 times 1.1 mm2.

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Available abstract

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 low-power 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 modulation. Fabricated in a 0.15-mum CMOS process, the proposed transmitter achieves EVM less than 8% for 2-Mchips/s MSK modulated signal and consumes 5.5 mA under a 1.55-V regulated power supply. The core area is 0.8 times 1.1 mm2.

Key concepts: Transmitter, Modulation (music), Radio transmitter design, CMOS, Delta-sigma modulation, Bit error rate, Electronic engineering, SIGNAL (programming language)

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