Title :
A 3.5-mW 15-Mbps O-QPSK transmitter for real-time wireless medical imaging applications
Author :
Liu, Yao-Hong ; Lin, Tsung-Hsien
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei
Abstract :
A 400-MHz phase-mux-based O-QPSK transmitter (TX) for medical imaging applications is presented in this paper. The modulation signal is generated by selecting one of the four quadrature phases to the TX output via a proposed Phase MUX. An inverter-type power amplifier is utilized for it is compatible with the quasi constant-envelope nature of the O-QPSK modulation. Fabricated in a 0.18-mum CMOS process, the whole TX draws 2.9 mA from a 1.2-V supply. With a maximum 15-Mbps data rate, the TX achieves an energy efficiency of 0.23 nJ/bit and delivers an output power up to -7 dBm.
Keywords :
biomedical imaging; low-power electronics; quadrature phase shift keying; O-QPSK transmitter; current 2.9 mA; frequency 400 MHz; inverter-type power amplifier; modulation signal; power 3.5 mW; real-time wireless medical imaging applications; size 0.18 mum; voltage 1.2 V; Baseband; Biomedical imaging; Digital filters; Energy consumption; Energy efficiency; Frequency shift keying; Frequency synthesizers; Phase modulation; Radio frequency; Transmitters;
Conference_Titel :
Custom Integrated Circuits Conference, 2008. CICC 2008. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-2018-6
Electronic_ISBN :
978-1-4244-2019-3
DOI :
10.1109/CICC.2008.4672157
