Title :
Low phase noise UHF TCXO
Author :
Bogomolov, D.V. ; Boroditsky, R.
Author_Institution :
Valpey-Fisher Inc., Hopkinton, MA
Abstract :
Low phase noise, good frequency stability over wide temperature range, tight initial frequency calibration and low power consumption of the signals sources are essential for many modern communication applications operating in UHF frequency band. The best sample of TCXO can provide good combination of these parameters only in 10divide50 MHz frequency band. A frequency translation technique should be applied to transform those signals in UHF band without phase noise degradation. UHF VCXO looked by PLL on a signal of 10 MHz TCXO allows to keep a good temperature stability and to achieve a phase noise level Lphi(1 kHz) = -108 dBc/Hz at 1 GHz carrier frequency. The circuit optimization allows decreasing an influence of PLL noise and obtaining a spectral purity of output signal, the level of a comparison frequency signal doesn´t exceed -85 dBc
Keywords :
UHF circuits; UHF oscillators; circuit optimisation; crystal oscillators; phase locked loops; 0.2 MHz; 1 GHz; 10 MHz; PLL circuit; PLL noise; UHF TCXO; UHF band; circuit optimization; good frequency stability; initial frequency calibration; low phase noise TCXO; phase noise degradation; Calibration; Circuit noise; Circuit optimization; Circuit stability; Degradation; Energy consumption; Frequency; Phase locked loops; Phase noise; Temperature distribution;
Conference_Titel :
Frequency Control Symposium and Exposition, 2005. Proceedings of the 2005 IEEE International
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-9053-9
DOI :
10.1109/FREQ.2005.1573983
