DocumentCode :
1634460
Title :
On the phase noise of ΔΣ frequency discriminator for applications in frequency synthesizer
Author :
Zheng, Shufeng ; Riley, Thomas A D ; Kostamovaara, Juha
Author_Institution :
Dept. of Electr. & Inf. Eng., Oulu Univ., Finland
Volume :
2
fYear :
2004
Firstpage :
1170
Abstract :
Phase noise analysis for the ΔΣ frequency discriminator is presented in this paper, and a new architecture is proposed to improve the noise performance. This technique uses a mixer following the VCO to downconvert discriminator input from RF range to IF. It reduces the effect of N times in-band phase noise amplification, and relaxes the requirement of timing accuracy in a higher order ΔΣ frequency discriminator. MATLAB simulation shows significant noise improvement in the presence of timing errors from logic devices.
Keywords :
delta-sigma modulation; frequency convertors; frequency synthesizers; mixers (circuits); phase noise; voltage-controlled oscillators; ΔΣ frequency discriminator; IF range; MATLAB simulation; VCO; downconversion; frequency synthesizer; mixer; noise performance; phase noise; timing errors; Flip-flops; Frequency conversion; Frequency synthesizers; Mathematical model; Phase locked loops; Phase modulation; Phase noise; Timing; Voltage; Voltage-controlled oscillators;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, Circuits and Systems, 2004. ICCCAS 2004. 2004 International Conference on
Print_ISBN :
0-7803-8647-7
Type :
conf
DOI :
10.1109/ICCCAS.2004.1346383
Filename :
1346383
Link To Document :
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