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Journal of the Korean Institute of Electromagnetic and Science 2004;4(4):156-161.
MMIC Cascade VCO with Low Phase Noise in InGaP/GaAs HBT Process for Ku-Band Application
Bhanu Shrestha1, Jae-Young Lee1, Jeiyoung Lee1, Sang-Hoon Cheon2, Nam-Young Kim1
1Dept. of Electronic Engineering, Kwangwoon University
2Knowledge on Inc.
The MMIC cascode VCO is designed, fabricated, and measured for Ku-band Low Noise Blcok(LNB) system using InGaP/GaAs HBT technology. The phase noise of -116.4 dBc/Hz at 1 MHz offset with output power of 1.3 dBm is obtained at 11.526 GHz by applying 3 V and 11 mA, which is comparatively better characteristics than compared with the different configuration VCOs fabricated with other technologies. The simulated results of oscillation frequency and second harmonic suppression agree with the measured results. The phase noise is improved due to the use of the smallest value of inductor in frequency determining network and the InGaP ledge function of the technology. The chip size of $830time781;{mu}m^2$ is also achieved.
Key words: HBT VCO, MMIC VCO, LC VCO, InGaP/GaAs VCO, LC Oscillator, Low Phase Noise VCO


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