Abstract
With a view to improving the phase noise and frequency variation of a microwave oscillator, a subharmonic injection-locked push-push oscillator using double-sided circuit technology is proposed. The proposed oscillator is realized by placing a microstrip line on the surface of a dielectric substrate and a slot line on the back side. This paper discusses the in-phase input of a subharmonic injection-locking signal with a simple circuit configuration. A 20-GHz subharmonic injection-locked push-push oscillator is designed by this configuration method and fabricated. When 5 GHz is used for the subharmonic injection signal, the locking range is found to be 240 MHz at an injection power of +14.5 dBm. The phase noise is −114.1 dBc/Hz at 1-MHz offset. © 2005 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 88(5): 1–9, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20156
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