Title :
A phase noise reduction technique in microwave oscillator using high-Q active filter
Author :
Lee, Jaechun ; Lee, Young-Taek ; Nam, Sangwook
Author_Institution :
Appl. Electromagn. Lab., Seoul Nat. Univ., South Korea
Abstract :
The authors present a 10 GHz oscillator that uses a high-Q active filter to reduce the phase noise. The loaded Q of active filter is obtained at about 500. This oscillator is compared with another oscillator which uses a passive filter. The difference of two oscillators´ Q is estimated at 12.5 times the open-loop gain simulation. The measured result of phase noise at 100 kHz offset shows maximum 10 dB reduction with high-Q active filter.
Keywords :
MMIC oscillators; Q-factor; active filters; feedback oscillators; hybrid integrated circuits; integrated circuit noise; microwave filters; microwave integrated circuits; phase noise; 10 GHz; MMIC; NE32484A HEMT; high-Q active filter; microwave oscillator; parallel feedback topology; phase noise reduction technique; series feedback; Active filters; Circuits; Microwave filters; Microwave oscillators; Microwave theory and techniques; Noise measurement; Passive filters; Phase measurement; Phase noise; Resonator filters;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2002.805541
