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A Microwave Push-Push VCO with Enhanced Power Efficiency in GaInP/GaAs HBT Technology  

Kim, Jong-Sik (Department of Radio Science and Engineering, Kwangwoon University)
Moon, Yeon-Guk (Ubiquitous Computing Center, Korea Electronics Technology Institute)
Won, Kwang-Ho (Ubiquitous Computing Center, Korea Electronics Technology Institute)
Shin, Hyun-Chol (Department of Radio Science and Engineering, Kwangwoon University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.44, no.9, 2007 , pp. 71-80 More about this Journal
Abstract
This paper presents a new push-push VCO technique that extracts a second harmonic output signal from a capacitive commonnode in a negativegm oscillator topology. The generation of the $2^{nd}$ harmonics is accounted for by the nonlinear current-voltage characteristic of the emitter-base junction diode causing; 1) significant voltage clipping and 2) different rising and falling time during the switching operation of core transistors. Comparative investigations show the technique is more power efficient in the high-frequency region that a conventional push-push technique using an emitter common node. Prototype 12GHz and 17GHz MMIC VCO were realized in GaInP/GaAs HBT technology. They have shown nominal output power of -4.3dBm and -5dBm, phase noise of -108 dBc/Hz and -110.4 dBc/Hz at 1MHz offset, respectively. The phase noise results are also equivalent to a VCO figure-of-merit of -175.8 dBc/Hz and -184.3 dBc/Hz, while dissipate 25.68mW(10.7mA/2.4V) and 13.14mW(4.38mA/3.0V), respectively.
Keywords
VCO; MMIC; GaInP/GaAs HBT; Push-Push VCO;
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