Title :
Reconfigurable FM-UWB transmitter
Author :
Zhou, B. ; Rhee, Woogeun ; Wang, Zhen
Author_Institution :
Inst. of Microelectron., Tsinghua Univ., Beijing, China
Abstract :
A 100 kbit/s frequency modulated ultra-wideband (FM-UWB) transmitter with digitally reconfigurable subcarrier modulation index (βsub), radio-frequency bandwidth (BRF) and carrier frequency band is presented and fabricated in 0.18 μm CMOS. A delta-sigma (ΔΣ) fractional-N phase-locked loop with an amplitude-controlled relaxation voltage-controlled oscillator (VCO) and digitally configurable 2-FSK modulation is designed for subcarrier generation, followed by a dual-path LC VCO, the centre frequency of which is set by a digitally configurable duty-cycled frequency-locked loop for nearly 600 MHz UWB signal generation.
Keywords :
CMOS integrated circuits; UHF integrated circuits; UHF oscillators; delta-sigma modulation; frequency locked loops; frequency modulation; frequency shift keying; phase locked loops; radio transmitters; relaxation oscillators; ultra wideband communication; voltage-controlled oscillators; CMOS process; UWB signal generation; amplitude-controlled relaxation voltage-controlled oscillator; bit rate 100 kbit/s; carrier frequency band; delta-sigma fractional-N phase-locked loop; digital configurable 2-FSK modulation; digital configurable duty-cycled frequency-locked loop; digital reconfigurable subcarrier modulation index; dual-path LC VCO; frequency modulated ultra-wideband transmitter; radiofrequency bandwidth; reconfigurable FM-UWB transmitter; size 0.18 mum; subcarrier generation;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2011.0261
