Title :
A 8.0-mW 1-Mbps ASK transmitter for wireless capsule endoscope applications
Author :
Shuguang, Han ; Baoyong, Chi ; Zhihua, Wang
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing
Abstract :
A 2.4GHz ASK transmitter suitable for low power wireless capsule endoscope system is presented. The mixer-based frequency up-conversion transmitter architecture is employed to achieve high data rate. A pseudo-differential stacked class-A power amplifier using the current reused technique is proposed to save power. The transmitter mainly includes two parts: a 20MHz ASK modulator based on the constant amplitude phase lock loop (PLL) and a direct up-conversion RF circuit. This design, implemented in TSMC 0.25mum CMOS process, achieves -23.217dBm output power with the data rate of 1Mbps and dissipates 3.17mA current from 2.5V power supply
Keywords :
CMOS integrated circuits; UHF frequency convertors; UHF power amplifiers; amplitude shift keying; biomedical electronics; endoscopes; low-power electronics; modulators; phase locked loops; radio transmitters; 0.25 micron; 1 Mbit/s; 2.5 V; 20 MHz; 3.17 mA; 8 mW; ASK transmitter; CMOS process; class-A power amplifier; current reused technique; direct up-conversion RF circuit; frequency up-conversion transmitter; phase lock loop; wireless capsule endoscope; Amplitude modulation; Amplitude shift keying; Circuits; Endoscopes; Phase locked loops; Phase modulation; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Transmitters;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2006 IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9572-7
DOI :
10.1109/RFIC.2006.1651138
