Title :
Nonlinear state-space model of charge-pump based frequency synthesizers
Author :
Johnson, Tord ; Holmberg, Johnny
Author_Institution :
Dept. of Electron., Malardalen Univ., Vasteras, Sweden
Abstract :
A novel and accurate nonlinear model to estimate the settling time of charge-pump based frequency synthesizers is presented. The correlation between the synthesizer lock time and the linear detection range of the phase-frequency detector is extensively investigated. An accurate analytical expression for the settling time of the frequency synthesizer is derived, showing less than 5% error compared to the presented state-space model.
Keywords :
frequency synthesizers; nonlinear network synthesis; parameter estimation; state-space methods; charge-pump based frequency synthesizers; linear detection range; nonlinear state-space model; phase-frequency detector; settling time estimation; synthesizer lock time; Charge pumps; Filters; Frequency conversion; Frequency synthesizers; Phase detection; Phase frequency detector; Phase locked loops; Quadratic programming; Stability; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465624
