Title :
A low data rate FM-UWB transmitter with-based sub-carrier modulation and quasi-continuous frequency-locked loop
Author :
Zhou, Bo ; He, Rui ; Qiao, Jian ; Liu, Jinghui ; Rhee, Woogeun ; Wang, ZhiHua
Author_Institution :
Inst. of Microelectron., Tsinghua Univ., Beijing, China
Abstract :
This paper describes the architecture and circuit design of a low data rate FM-UWB transmitter. A Δ-Σ fractional-N PLL with a multi-phase relaxation oscillator is designed to enable sub-carrier modulation with reduced quantization noise. The triangular waveform output of the relaxation oscillator directly modulates an LC VCO to have the UWB-compliant spectrum. The center frequency of the LC VCO is quasi-continuously tuned by a Δ-Σ DAC based frequency-locked loop with the power consumption of 1.1mW. The 3.43-4.03GHz FM-UWB transmitter implemented in 0.18μm CMOS consumes the total power of 9.6mW.
Keywords :
CMOS integrated circuits; delta-sigma modulation; frequency locked loops; phase locked loops; ultra wideband communication; voltage-controlled oscillators; CMOS; FM-UWB transmitter; LC VCO; circuit design; delta-sigma DAC; delta-sigma fractional-N PLL; delta-sigma modulation; frequency 3.43 GHz to 4.03 GHz; multiphase relaxation oscillator; power 1.1 mW; power 9.6 mW; quantization noise; quasicontinuous frequency-locked loop; size 0.18 mum; sub-carrier modulation; Frequency locked loops; Frequency shift keying; Radio frequency; Voltage-controlled oscillators;
Conference_Titel :
Solid State Circuits Conference (A-SSCC), 2010 IEEE Asian
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-8300-6
DOI :
10.1109/ASSCC.2010.5716550
