Title :
Investigation of cross-coupling effects inside a fractional-N frequency synthesiser
Author :
Jiang, Dai ; Brennan, Paul V.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London
Abstract :
This paper investigates the cross-coupling effects inside a fractional-N frequency synthesiser. The influence of three possible intermodulation points on the synthesiser´s noise performance is analysed and simulated based on a linearised PLL model and a synthesiser for the DCS 1800 application. Analytic and simulation results show that the intermodulation at the phase/frequency detector input is the main source of in-band intermodulation spurs
Keywords :
frequency synthesizers; intermodulation; phase detectors; phase locked loops; DCS 1800 application; cross-coupling effect; fractional-N frequency synthesiser; frequency detector; intermodulation point; linearised PLL model; phase detector; synthesiser noise performance; Additive noise; Analytical models; Circuit noise; Frequency synthesizers; Noise generators; Phase detection; Phase frequency detector; Phase locked loops; Phase noise; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2005. 48th Midwest Symposium on
Conference_Location :
Covington, KY
Print_ISBN :
0-7803-9197-7
DOI :
10.1109/MWSCAS.2005.1594357
