Low phase noise sapphire disk dielectric resonator oscillator with combined stabilization
- 17 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 451-458
- https://doi.org/10.1109/freq.1994.398298
Abstract
This paper deals with a theoretical analysis of a low phase noise microwave transistor oscillator stabilized with a sapphire "whispering gallery" mode disk dielectric resonator which used both as a filter in the oscillator feedback circuit and as a dispersive element of a frequency discriminator in the AFC loop providing additional noise degeneration. It is found that in many cases a noise floor of the AFC system is determined with residual flicker noise of a ferrite circulator used as a part of the discriminator circuitry. Replacing the circulator by a 3-dB hybrid and adding the auxiliary amplifier(s) at the phase detector input(s) open a possibility to reduce the AFC system noise floor as much as 30-35 dB and thus to get impressive improvement in the oscillator close-in phase noise.<>Keywords
This publication has 9 references indexed in Scilit:
- A Single-Resonator GaAs FET Oscillator with Noise DegenerationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- A high stability microwave oscillator based on a sapphire loaded superconducting cavityPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Low noise, microwave signal generation using cryogenic, sapphire dielectric resonators: an updatePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Closed loop tests of the NASA sapphire phase stabilizerPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- An uncooled microwave oscillator with 1-million effective Q-factorPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- High-Q TE stabilized sapphire microwave resonators for low noise applicationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- High spectral purity X-band sourcePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Measurement and analysis of a microwave oscillator stabilized by a sapphire dielectric ring resonator for ultra-low noiseIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1990
- Noise Properties of PLL SystemsIEEE Transactions on Communications, 1982