Ultra-low phase noise oscillator employing mixed electric and magnetic coupling resonator

Publication Type:
Journal Article
Microwave and Optical Technology Letters, 2020, 62, (5), pp. 1914-1919
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© 2020 Wiley Periodicals, Inc. In this article, a pair of stub-loaded interdigital hairpin resonators-based filter with high group delay and improved stopband suppression is used to design an S-band ultra-low phase noise single-ended oscillator. A transmission zero closed to the edge of passband in the filter is generated by introducing strong electric and magnetic coupling, which can improve the phase noise performance of the proposed oscillator. A low phase noise figure-of-merit (FOM) that considers both insertion loss and group delay of the feedback loop is used to evaluate the overall phase noise performance of the proposed oscillator. In order to verify the concept, the proposed oscillator is designed and fabricated. The measured results show that the oscillation frequency is 2.037 GHz with the output power of 8.92 dBm while the second harmonic suppression level is about 35.66 dB. The phase noise and the FOM of the proposed oscillator at 100 kHz frequency offset are −127.95 and −199.31 dBc/Hz, respectively. According to the open literature, this is one of the best phase noise performances of the single-ended hybrid integrated oscillators oscillating at the similar frequency range.
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