Author: Jeong, H.S.
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High Efficient GaN/SiC Solid-State Technology for 1.3GHz Superconducting Cavity RF Power Source  
  • H.S. Jeong, S. Cho, H. Jung, B.G. Kang, H.J. Yoo, T.S. Yoon
    RFHIC, GyeongGi-Do, Republic of Korea
  The conventional RF power source of the accelerator, Klystron, has been used for a long time. Now, the solid-state technology is getting spotlight because of its competitive cost, easy maintenance, low/safe power supply voltage. Although LDMOS transistors are commonly known in the accelerator field, Gallium Nitride on Silicon Carbide or GaN/SiC transistor has proven its superior RF performances, higher efficiency, and smaller size in the telecom and the military field. RFHIC introduces a new GaN/SiC transistor which is specialized for 1.3GHz superconducting cavity RF power source. It maximizes its efficiency, 80%, with efficiency-contour matching techniques at 550W CW, using two 41.8mm gate-width GaN/SiC dies. The transistor is simulated with ADS, and the load-pull test verifies its performance. This transistor is utilized in designing a 2kW solid-state power amplifier with 70% efficiency. It consists of four 550W transistors with T-junction combining technology. Indeed, it contains accurate power monitoring and reflected power protection circuits. The ultimate goal of this 1.3GHz GaN/SiC solid-state technology is to replace current CW klystron up to several hundred kW.  
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