Title :
Fractional-N frequency synthesis: Overview and design perspectives
Author :
Rhee, Woogeun ; Zhou, Bo ; Wang, ZhiHua
Author_Institution :
Inst. of Microelectron., Tsinghua Univ., Beijing, China
fDate :
Nov. 30 2011-Dec. 2 2011
Abstract :
This paper gives an overview of fractional-N frequency synthesis with design perspectives focusing on ΔΣ fractional-N phase-locked loops (PLLs). Spur generation and nonlinearity issue in the ΔΣ fractional-N PLLs are discussed with hardware results. High-order ΔΣ modulation with embedded FIR filtering is considered for low noise frequency generation. Also, various architectures of finite-modulo fractional-N PLLs are reviewed for alternative low noise design.
Keywords :
frequency synthesizers; phase locked loops; FIR filtering; PLL; Spur generation; fractional-N frequency synthesis; high-order ΔΣ modulation; low noise frequency generation; Finite impulse response filter; Frequency modulation; Frequency synthesizers; Noise; Phase locked loops; Voltage-controlled oscillators;
Conference_Titel :
Radio-Frequency Integration Technology (RFIT), 2011 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4577-0517-5
DOI :
10.1109/RFIT.2011.6141757
