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Simple K-band MMIC VCO utilizing a miniaturized hairpin resonator and a three-terminal p-HEMT varactor with low phase noise and high output power properties

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5 Author(s)
Cheol-Gyu Hwang ; Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejon, South Korea ; Jeong-Seon Lee ; Jeong-Hoon Kim ; Noh-Hoon Myung
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Presents a fully monolithic K-band MMIC voltage-controlled oscillator (VCO) implemented by using a 0.25 μm AlGaAs/InGaAs pseudomorphic HEMT (p-HEMT) technology. The use of a half-wavelength miniaturized hairpin-shaped resonator and a three-terminal p-HEMT varactor was effective in reducing the chip size and simplifying fabrication processes of the microwave MMIC VCO without impairing the performance of the circuit. The VCO provides a typical output power of 11.5 dBm at 20.8 GHz and a free-running phase noise of -82 dBc/Hz at 100 kHz offset and -95 dBc/Hz at 1 MHz offset. It also shows a tuning range of 70 MHz with little reduction in output power and high yield properties. The chip size of the MMIC VCO is 1.5 × 2.0 mm2.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:13 ,  Issue: 6 )