Title :
Impact of Stabilizing Networks on Phase Noise in Microwave Bridge Oscillators
Author :
Tsarapkin, Dmitry P. ; Kozlov, Sergey S.
Author_Institution :
Fac. of Radio Eng., Moscow Power Eng. Inst.
Abstract :
The microwave oscillator utilizing a bridge-type network as a positive feedback loop filter (MBoS) opens a possibility to increase an oscillator effective g-factor by many times thus improving its frequency stability and phase noise. This paper develops the previous analysis taking into account impact on MBoS phase noise of auxiliary stabilizing networks (SNs) used in practical design to prevent parasitic oscillations. The SNs under analysis are presented with a classic transmission resonator (SN1), a new non-minimal-phase circuit of the second order having two pairs of complex conjugate zeros and poles (SN2) and their combination. As expected, the optimized MBoS could provide as low phase noise as approximately -(140... 145) dBc/Hz at 1 kHz offset in the case of a room temperature X-band oscillator utilizing sapphire whispering-gallery resonator
Keywords :
circuit feedback; frequency stability; microwave oscillators; phase noise; sapphire; transfer functions; X-band; feedback loop filter; frequency stability; g-factor; microwave bridge oscillators; phase noise; sapphire whispering-gallery resonator; stabilizing networks; transmission resonator; Bridge circuits; Feedback loop; Microwave filters; Microwave oscillators; Phase noise; Poles and zeros; Q factor; Resonant frequency; Stability; Transfer functions;
Conference_Titel :
International Frequency Control Symposium and Exposition, 2006 IEEE
Conference_Location :
Miami, FL
Print_ISBN :
1-4244-0074-0
Electronic_ISBN :
1-4244-0074-0
DOI :
10.1109/FREQ.2006.275470
