Accurate Phase-Noise Prediction for a Balanced Colpitts GaN HEMT MMIC Oscillator
Journal article, 2013

This paper presents an X-band balanced Colpitts oscillator in GaN HEMT technology and a method to calculate its phase noise accurately. The method employs a low-frequency (LF) noise measurement and the oscillator waveforms from a harmonic-balance simulator. These data are post-calculated by Hajimiri's phase-noise model, in which the LF noise can be activated with a cyclo-stationary effect in the calculation of phase noise. Compared to commercial phase-noise simulation using predefined stationary noise, the calculation gives significantly improved phase-noise prediction in the 30-dB/decade region near carrier. The prediction is within 3-dB accuracy at 10-kHz, 100-kHz, and 1-MHz offset frequencies. In addition to the method used for phase-noise prediction, the potential for wideband tuning of this oscillator topology is analytically investigated. The measured phase noise of the oscillator is -102 dBc/Hz at 100-kHz offset from a 8.6-GHz carrier frequency for drain voltage and current of Vd = 15 V amd Id = 40 mA.

oscillator

Cyclo-stationary noise

phase noise

low-frequency (LF) noise

GaN HEMT

monolithic microwave integrated circuit (MMIC)

Author

Szhau Lai

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Dan Kuylenstierna

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

Mikael Hörberg

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Niklas Rorsman

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

Iltcho Angelov

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Kristoffer Andersson

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Herbert Zirath

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN)

Vol. 61 11 3916-3926

Areas of Advance

Information and Communication Technology

Nanoscience and Nanotechnology (2010-2017)

Subject Categories

Physical Sciences

DOI

10.1109/tmtt.2013.2282131

More information

Created

10/8/2017