| Optimized Phase Noise of LC VCO Using an Asymmetrical Inductance Tank |
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Jae-Ho Yoon, Bhanu Shrestha, Ah-Rah Koh, Gary P. Kennedy, Nam-Young Kim |
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Department of Electronic Engineering, Kwangwoon University |
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| Abstract |
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This paper describes fully integrated low phase noise MMIC voltage controlled oscillators(VCOs). The Asymmetrical Inductance Tank VCO(AIT-VCO), which optimize the shortcoming of the previous tank's inductance optimization approach, has lower phase noise performance due to achieving higher equivalent parallel resistance and Q value of the tank. This VCO features an output power signal in the range of - 11.53 dBm and a tuning range of 261 MHz or 15.2 % of its operating frequency. This VCO exhibits a phase noise of - 117.3 dBc/Hz at a frequency offset of 100 kHz from carrier. A phase noise reduction of 15 dB was achieved relative to only one spiral inductor. The AIT-VCO achieved low very low figure of merit of -184.6 dBc/Hz. The die area, including buffers and bond pads, is $0.9{times}0.9mm^2$. |
| Key words:
Symmetrical and Asymmetrical Inductance Tank Structures, Monolithic Microwave Integrated Circuit (MMIC), Heterodyne Bipolar Transistor(HBT), Differential LC VCO, Phase Noise, Cross Coupled Configuration |
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