Title :
A 5.5mA 2.4-GHz two-point modulation Zigbee transmitter with modulation gain calibration
Author :
Yu, Rui ; Yeo, Theng-Tee ; Tan, Kwang-Hung ; Mou, Shouxian ; Cui, Yike ; Wang, Haifeng ; Yap, Hwa-Seng ; Ting, Eugene ; Itoh, Masaaki
Author_Institution :
WIPRO Techno Center, Singapore, Singapore
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.
Keywords :
CMOS integrated circuits; calibration; phase locked loops; sigma-delta modulation; transmitters; CMOS process; IEEE 802.15.4 compliant transmitter; MSK modulated signal; Zigbee transmitter; closed-loop calibration; current 5.5 mA; frequency 2.4 GHz; gain mismatch; sigma-delta fractional-N PLL based transmitter; size 0.15 mum; two-point modulation; voltage 1.55 V; Calibration; Circuits; Delay; Frequency measurement; Inverters; MOS devices; Ring oscillators; Tiles; Transmitters; ZigBee;
Conference_Titel :
Custom Integrated Circuits Conference, 2009. CICC '09. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-4071-9
Electronic_ISBN :
978-1-4244-4073-3
DOI :
10.1109/CICC.2009.5280802
