Low Phase-Noise Planar Oscillators Employing Elliptic-Response Bandpass Filters

Autor:	Morteza Nick, Amir Mortazawi, Jonghoon Choi
Rok vydání:	2009
Předmět:	Physics Radiation Oscillator phase noise Acoustics Local oscillator Variable-frequency oscillator Condensed Matter Physics Vackář oscillator Voltage-controlled oscillator Control theory RC oscillator Phase noise Elliptic filter Electrical and Electronic Engineering
Zdroj:	IEEE Transactions on Microwave Theory and Techniques. 57:1959-1965
ISSN:	1557-9670 0018-9480
DOI:	10.1109/tmtt.2009.2025424
Popis:	In this paper, a low phase-noise planar oscillator employing an elliptic bandpass filter as a frequency stabilization element within its feedback loop is presented. The oscillator phase noise is significantly reduced by taking advantage of the group-delay peaks formed at the passband edges of the elliptic filter. A filter optimization technique for low phase-noise oscillator designs is introduced and applied to a four-pole bandpass elliptic filter. An X-band oscillator using the optimized filter in the feedback loop is designed and tested. At the oscillation frequency of 8.05 GHz, the measured phase noise is -143.5 dBc/Hz at 1-MHz offset frequency. The oscillator exhibits an output power of 3.5 dBm with an dc-RF efficiency of 10%. To the authors' best knowledge, this is the lowest phase noise performance for an X-band planar microwave oscillator.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1b419329a8251364ea3b25f520ae332c https://doi.org/10.1109/tmtt.2009.2025424 Zobrazit plný text záznamu