An X-band Low Phase Noise Oscillator Employing a Four-pole Elliptic-Response Microstrip Bandpass Filter

@article{Choi2007AnXL,
  title={An X-band Low Phase Noise Oscillator Employing a Four-pole Elliptic-Response Microstrip Bandpass Filter},
  author={Jonghoon Choi and Meng-Hung Chen and Amir Mortazawi},
  journal={2007 IEEE/MTT-S International Microwave Symposium},
  year={2007},
  pages={1529-1532}
}
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 an elliptic filter. An X-band oscillator using a SiGe HBT packaged transistor has been designed and tested. At the oscillation frequency of 9 GHz, the measured phase noise is -140 dBc/Hz at 1 MHz offset… CONTINUE READING
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