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2018-11-09

A Novel Low Phase Noise Push-Push Oscillator Employing Dual-Feedback Sub-Oscillators

By Elton Lima, Takayuki Tanaka, and Ichihiko Toyoda
Progress In Electromagnetics Research M, Vol. 75, 141-148, 2018
doi:10.2528/PIERM18080701

Abstract

In this paper, a novel X-band push-push oscillator employing dual-feedback sub-oscillators and a half-wavelength microstrip line resonator is presented. The dual-feedback sub-oscillator consists of a series feedback commonly used in conventional oscillators due to its good phase noise performance and a parallel feedback circuit which improves both the output power and stability. The resonator and power combiner form a single circuit allowing compact size. Measured results show that an excellent output power of +13.3 dBm was obtained at the second harmonic frequency of 9.81 GHz. Moreover, superior phase noise of -105.0 dBc/Hz and -123.5 dBc/Hz were achieved at 100-kHz and 1-MHz offset frequencies, respectively. The suppression of undesired harmonic signals, namely fundamental and third harmonic signals, are 27.9 dB and 55.7 dB, respectively. With a simple design structure and compact size the proposed push-push oscillator achieved very good performance.

Citation


Elton Lima, Takayuki Tanaka, and Ichihiko Toyoda, "A Novel Low Phase Noise Push-Push Oscillator Employing Dual-Feedback Sub-Oscillators," Progress In Electromagnetics Research M, Vol. 75, 141-148, 2018.
doi:10.2528/PIERM18080701
http://www.jpier.org/PIERM/pier.php?paper=18080701

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