J. Semicond. > 2010, Volume 31 > Issue 7 > 074012

SEMICONDUCTOR DEVICES

An 8 GHz high power AlGaN/GaN HEMT VCO

Chen Huifang, Wang Xiantai, Chen Xiaojuan, Luo Weijun and Liu Xinyu

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DOI: 10.1088/1674-4926/31/7/074012

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Abstract: A high power X-band hybrid microwave integrated voltage controlled oscillator (VCO) based on AlGaN/GaN HEMT is presented. The oscillator design utilizes a common-gate negative resistance structure with open and short-circuit stub microstrip lines as the main resonator for a high Q factor. The VCO operating at 20 V drain bias and -1.9 V gate bias exhibits an output power of 28 dBm at the center frequency of 8.15 GHz with an efficiency of 21%. Phase noise is estimated to be -85 dBc/Hz at 100 kHz offset and -128 dBc/Hz at 1 MHz offset. The tuning range is more than 50 MHz. The dominating effect of GaN HEMT's flicker noise on oscillator phase noise performance has also been discussed. The measured results show great promise for AlGaN/GaN HEMT technology to be used in high power and low phase noise microwave source applications.

Key words: AlGaN/GaN HEMTnegative resistance VCOhigh powerphase noiseflicker noise

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    Received: 18 August 2015 Revised: 12 March 2010 Online: Published: 01 July 2010

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      Chen Huifang, Wang Xiantai, Chen Xiaojuan, Luo Weijun, Liu Xinyu. An 8 GHz high power AlGaN/GaN HEMT VCO[J]. Journal of Semiconductors, 2010, 31(7): 074012. doi: 10.1088/1674-4926/31/7/074012 ****Chen H F, Wang X T, Chen X J, Luo W J, Liu X Y. An 8 GHz high power AlGaN/GaN HEMT VCO[J]. J. Semicond., 2010, 31(7): 074012. doi: 10.1088/1674-4926/31/7/074012.
      Citation:
      Chen Huifang, Wang Xiantai, Chen Xiaojuan, Luo Weijun, Liu Xinyu. An 8 GHz high power AlGaN/GaN HEMT VCO[J]. Journal of Semiconductors, 2010, 31(7): 074012. doi: 10.1088/1674-4926/31/7/074012 ****
      Chen H F, Wang X T, Chen X J, Luo W J, Liu X Y. An 8 GHz high power AlGaN/GaN HEMT VCO[J]. J. Semicond., 2010, 31(7): 074012. doi: 10.1088/1674-4926/31/7/074012.

      An 8 GHz high power AlGaN/GaN HEMT VCO

      DOI: 10.1088/1674-4926/31/7/074012
      • Received Date: 2015-08-18
      • Accepted Date: 2010-02-01
      • Revised Date: 2010-03-12
      • Published Date: 2010-07-05

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