Title :
Battery-less ASK/O-QPSK transmitter for medical implants
Author :
Chen, Hung-Chuan ; Lee, Woo-Kyung
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan
Abstract :
A battery-less ASK/O-QPSK transmitter is presented using 0.18 μm CMOS technology for medical implants. The 432 MHz transmitter uses an identical signal source of 54 MHz for injection-locked frequency synthesis and RF powering to accomplish battery-less operation. The transmitter exhibits an output power of -15.1 dBm. The phase noises of -112.6 and -116.1 dBc/Hz are achieved at offsets of 100 and 1 MHz from 432 MHz, respectively. The maximum data rates are 50 kbit/s and 2.5 Mbit/s for ASK and O-QPSK modulation schemes, respectively.
Keywords :
CMOS integrated circuits; amplitude shift keying; biomedical electronics; phase noise; prosthetics; quadrature phase shift keying; signal sources; transmitters; CMOS technology; RF powering; batteryless ASK/O-QPSK transmitter; bit rate 2.5 Mbit/s; bit rate 50 kbit/s; frequency 1 MHz to 432 MHz; identical signal source; injection-locked frequency synthesis; medical implants; phase noises; size 0.18 mum;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2012.1172
